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• What’s new in IIS8, Perf, Indexing Service-Week 49

  - by OWScott

  You can find this week’s video here. After some delays in the publishing process week 49 is finally live.  This week I'm taking Q&A from viewers, starting with what's new in IIS8, a question on enable32BitAppOnWin64, performance settings for asp.net, the ARR Helper, and Indexing Services. Starting this week for the remaining four weeks of the 52 week series I'll be taking questions and answers from the viewers. Already a number of questions have come in. This week we look at five topics. Pre-topic: We take a look at the new features in IIS8. Last week Internet Information Services (IIS) 8 Beta was released to the public. This week's video touches on the upcoming features in the next version of IIS. Here’s a link to the blog post which was mentioned in the video Question 1: In a number of places (http://learn.iis.net/page.aspx/201/32-bit-mode-worker-processes/, http://channel9.msdn.com/Events/MIX/MIX08/T06), I've saw that enable32BitAppOnWin64 is recommended for performance reasons. I'm guessing it has to do with memory usage... but I never could find detailed explanation on why this is recommended (even Microsoft books are vague on this topic - they just say - do it, but provide no reason why it should be done). Do you have any insight into this? (Predrag Tomasevic) Question 2: Do you have any recommendations on modifying aspnet.config and machine.config to deliver better performance when it comes to "high number of concurrent connections"? I've implemented recommendations for modifying machine.config from this article (http://www.codeproject.com/KB/aspnet/10ASPNetPerformance.aspx - ASP.NET Process Configuration Optimization section)... but I would gladly listen to more recommendations if you have them. (Predrag Tomasevic) Question 3: Could you share more of your experience with ARR Helper? I'm specifically interested in configuring ARR Helper (for example - how to only accept only X-Forwards-For from certain IPs (proxies you trust)). (Predrag Tomasevic) Question 4: What is the replacement for indexing service to use in coding web search pages on a Windows 2008R2 server? (Susan Williams) Here’s the link that was mentioned: http://technet.microsoft.com/en-us/library/ee692804.aspx This is now week 49 of a 52 week series for the web pro. You can view past and future weeks here: http://dotnetslackers.com/projects/LearnIIS7/ You can find this week’s video here.

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• Networking Guidelines

  - by ACShorten

  One of the things I have noticed in my years in IT is the changes in networking. In the past networking was pretty simple with the host name and name resolution (via DNS) being pretty simple. Some sites still use this simple networking setup. These days, more complex name resolution, proxies, firewalls, demarcation nd virtualization, can make networking more complex. This can cause issues when installing products with in built networking that can frustrate even seasoned veterans. I have put together a few basic guidelines to hopefully help along with product installation and getting a product to operate in a somewhat complex network setup. All the components of the product (including the infrastructure) need to communicate via a network (even it is within a local machine/host). Ensure any host names referred to within configuration files are accessible via your networking setup. This may mean defining the hosts to the machines, to the DNS for name resolution and even your firewall to allow machines to communicate within your network. Make sure the ports used for any of the infrastructure are accessible (even through your firewall) and are unique within the host. Host duplication can cause the product to fail on startup as the port is already in use. If there are still issues, consider using localhost as your host name. I have used this in so many situations that I tend to use it now as a default anytime I install anything myself. Most Oracle products suggest to use localhost when using dynamic host or dynamic IP addresses and this is no different for the Oracle Utilities Application Framework. If you do use localhost then installing a Loopback Adapter for the operating system is recommended to force networking to a minimum. Usually localhost resolves to 127.0.0.1. When using multiple network connections, especially in a virtualized environment, ensure the host and ports used are relevent for the network cards you have setup. One of the common issues is finding the product is using a vierualized network card only to find that it is not setup for correct networking. If you are using the batch component, do not forget to ensure that the multicast protocol is enabled on your host and that the multicast address and port number specified are valid and accessible from all machines in the batch cluster (if clustering used). The same advice applies if you are using unicast where each host/port combination should be accessible. Hopefully these basic networking recommendations will help minimize any networking issues you might encounter.

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• Are there any concerns with using a static read-only unit of work so that it behaves like a cache?

  - by Rowan Freeman

  Related question: How do I cache data that rarely changes? I'm making an ASP.NET MVC4 application. On every request the security details about the user will need to be checked with the area/controller/action that they are accessing to see if they are allowed to view it. The security information is stored in the database. For example: User Permission UserPermission Action ActionPermission A "Permission" is a token that is applied to an MVC action to indicate that the token is required in order to access the action. Once a user is given the permission (via the UserPermission table) then they have the token and can therefore access the action. I've been looking in to how to cache this data (since it rarely changes) so that I'm only querying in-memory data and not hitting a database (which is a considerable performance hit at the moment). I've tried storing things in lists, using a caching provider but I either run in to problems or performance doesn't improve. One problem that I constantly run in to is that I'm using lazy loading and dynamic proxies with EntityFramework. This means that even if I ToList() everything and store them somewhere static, the relationships are never populated. For example, User.Permissions is an ICollection but it's always null. I don't want to Include() everything because I'm trying to keep things simple and generic (and easy to modify). One thing I know is that an EntityFramework DbContext is a unit of work that acts with 1st-level caching. That is, for the duration of the unit of work, everything that is accessed is cached in memory. I want to create a read-only DbContext that will exist indefinitely and will only be used to read about permission data. Upon testing this it worked perfectly; my page load times went from 200ms+ to 20ms. I can easily force the data to refresh at certain intervals or simply leave it to refresh when the application pool is recycled. Basically it will behave like a cache. Note that the rest of the application will interact with other contexts that exist per request as normal. Is there any disadvantage to this approach? Could I be doing something different?

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• cpan won't configure correctly on centos6, can't connect to internet

  - by dan

  I have Centos 6 setup and have installed perl-CPAN. When I run cpan it takes me through the setup and ends by telling me it can't connect to the internet and to enter a mirror. I enter a mirror, but it still can't install the package. What am I doing wrong? If you're accessing the net via proxies, you can specify them in the CPAN configuration or via environment variables. The variable in the $CPAN::Config takes precedence. <ftp_proxy> Your ftp_proxy? [] <http_proxy> Your http_proxy? [] <no_proxy> Your no_proxy? [] CPAN needs access to at least one CPAN mirror. As you did not allow me to connect to the internet you need to supply a valid CPAN URL now. Please enter the URL of your CPAN mirror CPAN needs access to at least one CPAN mirror. As you did not allow me to connect to the internet you need to supply a valid CPAN URL now. Please enter the URL of your CPAN mirror mirror.cc.columbia.edu::cpan Configuration does not allow connecting to the internet. Current set of CPAN URLs: mirror.cc.columbia.edu::cpan Enter another URL or RETURN to quit: [] New urllist mirror.cc.columbia.edu::cpan Please remember to call 'o conf commit' to make the config permanent! cpan shell -- CPAN exploration and modules installation (v1.9402) Enter 'h' for help. cpan[1]> install File::Stat CPAN: Storable loaded ok (v2.20) LWP not available Warning: no success downloading '/root/.cpan/sources/authors/01mailrc.txt.gz.tmp918'. Giving up on it. at /usr/share/perl5/CPAN/Index.pm line 225 ^CCaught SIGINT, trying to continue Warning: Cannot install File::Stat, don't know what it is. Try the command i /File::Stat/ to find objects with matching identifiers. cpan[2]>

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• Connecting to ItsHidden in Ubuntu 9.10 problems

  - by Ionel Bratianu

  I try to setup a VPN connection to ItsHidden on Ubuntu 9.10. I double-checked my credentials in the VPN configuration, but I don't think that this is problem. In my syslog I got these messages: Jan 11 14:38:46 NetworkManager: Starting VPN service 'org.freedesktop.NetworkManager.pptp'... Jan 11 14:38:46 NetworkManager: VPN service 'org.freedesktop.NetworkManager.pptp' started (org.freedesktop.NetworkManager.pptp), PID 4502 Jan 11 14:38:46 NetworkManager: VPN service 'org.freedesktop.NetworkManager.pptp' just appeared, activating connections Jan 11 14:38:46 NetworkManager: VPN plugin state changed: 1 Jan 11 14:38:46 NetworkManager: VPN plugin state changed: 3 Jan 11 14:38:46 pppd[4506]: Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded. Jan 11 14:38:46 NetworkManager: VPN connection 'ItsHidden' (Connect) reply received. Jan 11 14:38:46 pppd[4506]: pppd 2.4.5 started by root, uid 0 Jan 11 14:38:46 pppd[4506]: Using interface ppp0 Jan 11 14:38:46 NetworkManager: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Jan 11 14:38:46 NetworkManager: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found. Jan 11 14:38:46 pppd[4506]: Connect: ppp0 /dev/pts/1 Jan 11 14:39:06 pptp[4508]: nm-pptp-service-4502 fatal[get_ip_address:pptp.c:430]: gethostbyname 'vpn.itshidden.com': HOST NOT FOUND Jan 11 14:39:06 pppd[4506]: Modem hangup Jan 11 14:39:06 pppd[4506]: Connection terminated. Jan 11 14:39:06 NetworkManager: VPN plugin failed: 1 Jan 11 14:39:06 NetworkManager: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Jan 11 14:39:06 pppd[4506]: Exit. Jan 11 14:39:06 NetworkManager: VPN plugin failed: 1 Jan 11 14:39:06 NetworkManager: VPN plugin failed: 1 Jan 11 14:39:06 NetworkManager: VPN plugin state changed: 6 Jan 11 14:39:06 NetworkManager: VPN plugin state change reason: 0 Jan 11 14:39:06 NetworkManager: connection_state_changed(): Could not process the request because no VPN connection was active. Jan 11 14:39:06 NetworkManager: Policy set 'Auto eth0' (eth0) as default for routing and DNS. Jan 11 14:39:19 NetworkManager: [1263213559.003098] ensure_killed(): waiting for vpn service pid 4502 to exit Jan 11 14:39:19 NetworkManager: [1263213559.003289] ensure_killed(): vpn service pid 4502 cleaned up Because the gethostbyname is failing, I suppose that the NetworkManager doesn't know that I use proxies for accessing Internet. I'm not sure that this is the real problem. Could you tell me a solution to make gesthostbyname not failing anymore?

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• Having trouble redirecting frevvo using mod_proxy

  - by user38859

  This question is similar to this: http://serverfault.com/questions/102868/how-to-access-webservers-running-on-ports-blocked-on-companys-network Basically, I'm using confluence and a plugin called frevvo. Confluence sits on port 8080 while frevvo sits on port 8082. I want to redirect both of them to port 80 via Apache HTTP web server so that it doesn't get blocked by company proxies. I've been using the document on Atlassian that shows me how to run confluence behind Apache (I can't post a second URL due to being a newbie here) I've successfully redirected Confluence from port 8080 to port 80 so I can now access Confluence using www.example.com/confluence. Now I tried doing the same thing to frevvo with the following configurations: Apache httpd: ProxyRequests Off ProxyPreserveHost On <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /confluence http://localhost:8080/confluence ProxyPassReverse /confluence http://localhost:8080/confluence <Location /confluence> Order allow,deny Allow from all </Location> ProxyPass /frevvo http://localhost:8082/ ProxyPassReverse /frevvo http://localhost:8082/ <Location /forms> Order allow,deny Allow from all </Location> And in server.xml for the frevvo Tomcat instance, I added the following within <Host> tag: <Context path=" " docBase="" debug="0" reloadable="false"> <!-- Logger is deprecated in Tomcat 5.5. Logging configuration for Confluence is specified in confluence/WEB-INF/classes/log4j.properties --> <Manager pathname="" /> </Context> The plugin, frevvo, when accessed through the browser using http://localhost:8082 usually redirect to http://localhost:8082/frevvo/web With the above configuration, when accessing www.example.com.au/frevvo redirects to www.example.com/frevvo/web/static/login - which doesn't work. I hope the above details is clear and appreciate anyone who could give us some insight.

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• Couldn't upload files to Sharepoint site while passing through Squid Proxy

  - by Ecio

  Hi all, we have this issue: one of our employees is collaborating with a supplier and he needs to upload documents on a Sharepoint site hosted on the supplier's main site. In our environment we use Squid Proxy to allow people navigate on the net (we have NTLM authentication and users transparently authenticate while using IE and FF). It seems that this specific Sharepoint site is using Integrated Windows Authentication only, and according to some research on the net it seems that this can have troubles with proxies. More specifically, we have tried two Squid versions: with Squid 3.0 we are unable to login to the site (the browser loads an empty page) with Squid 2.7 (that supports "Connection Pinning") we are able to login into the site, move on the different sections BUT.. when we try to upload a file that is bigger than a couple of KiloBytes (i.e. 10KB) the browser loads an error page (i think it's a 401 unauthorized but i must verify it) we've tried changing a couple of Squid options (in 2.7), what we got is that when you try to upload the file you got an authentication box (just like the initial login) and it refuses to go on even if you enter the same authentication credentials. What's really strange is that when you try to upload a small file (i.e. a text or binary 1KB file) the upload succeeds. I initially thought that maybe there was something misconfigured on their Sharepoint site but I've tried also this site: www.xsolive.com (it's a sharepoint 2007 demo site) and I've experienced the same problem. Has any of you experienced such behaviour? Thanks! Of course we've suggested to the supplier to activate also Basic+SSL and we're waiting for their reply..

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• Zabbix Proxy not collecting data

  - by Jordan Eunson

  I have a working Zabbix 1.8.2 server collecting data for our office and our colo facility. However the link between the colo and office is flaky. What I'm trying to do is setup a proxy on the colo side to have a 1 hour cache and relay the data to our primary server at the office. Our zabbix server is compiled from source and uses a mysql database I've followed the instructions found in the zabbix documentation to compile the proxy using a sqlite3 database. I add the proxy to zabbix under Administration-DM-Proxies. The zabbix server "sees" the proxy because the "last seen" field is always under 60s. However when I assign a colo host to the proxy I stop receiving data from it. The colo host's zabbix_agentd.log file says this: 29343:20100622:124847 Timeout while answering request 29343:20100622:124847 Getting list of active checks failed. Will retry after 60 seconds The zabbix_proxy.log says this. 2041:20100622:123131.760 Deleted 0 records from history [0.000994 seconds] 2028:20100622:124131.671 Error while receiving answer from server [ZBX_TCP_READ() failed I also am unable to receive any SNMP data which is more important to me than the zabbix agent data. Has anyone had this problem before? Zabbix Server OS: CentOS5.4 Zabbix Server Build: 1.8.2 from source Zabbix Proxy OS: CentOS5.4 Zabbix Proxy Build: 1.8.2 from source P.S. The SQLite database on the zabbix proxy never gets any data written to it, it is identical to when I created it from the blank schema in zabbix-1.8.2/create/schema. (Yes I've checked the permissions)

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• Why Hebrew letters in the address bar break the ARR gateway (Only With Explorer 8,9,10)?

  - by Noamway

  The ARR is working great in all browsers except Internet Explorer 8,9,10. When I paste Hebrew URL directly to the address bar it's working good, but when I surf (click on a simple href URL) from one Hebrew URL page to another Hebrew URL the ARR return me that error: "502 - Web server received an invalid response while acting as a gateway or proxy server." There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server. I checked it number of times including with HTTP analyzer and I saw that the "referer" is making all the problems and cause to that error. For example when I enter to that page: mydomain.com/somehebrewchars (mydomain.com/???? you will need Hebrew install) And click in the page on a link to: mydomain.com/somehebrewchars2 (mydomain.com/???????? you will need Hebrew install) I will get the error above and when you look at the referrer you will see something like that: mydomain.com/עמוד-× ×—×™×ª×” We use other proxies application to others projects and we don't have the same issue like that. For this example we used WIN 2008 and 2012 with ARR 2.5 and also 3 beta. Any help is welcome :-) Thanks, Noam

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• What is Apache Synapse?

  - by Aren B

  My website keeps getting hit by odd requests with the following user-agent string: Mozilla/4.0 (compatible; Synapse) Using our friendly tool Google I was able to determine this is the hallmark calling-card of our friendly neighborhood Apache Synapse. A 'Lightweight ESB (Enterprise Service Bus)'. Now, based on this information I was able to gather, I still have no clue what this tool is used for. All I can tell is that is has something to do with Web-Services, and supports a variety of protocols. The Info page only leads me to conclude it has something to do with proxies, and web-services. The problem I've run into is that while normally I wouldn't care, we're getting hit quite a bit by Russian IPs (not that russian's are bad, but our site is pretty regionally specific), and when they do they're shoving wierd (not xss/malicious at least not yet) values into our query string parameters. Things like &PageNum=-1 or &Brand=25/5/2010 9:04:52 PM. Before I go ahead and block these ips/useragent from our site, I'd like some help understanding just what is going on. Any help would be greatly appreciated :)

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• Chroot jail of Nginx and php

  - by sqren

  I'm hosting multiple websites on one VPS, and want to chroot each website, eg. /chroot/website1 /chroot/website2 I'm using makejail, which is a highlevel tool, for creating the jails, and copying the libraries and dependencies. Easy peasy. Each website will need nginx, php and mysql. For php I'm using php5-fpm which actually supports chroot by configuration, however I'm not using this (maybe I should?) My question is which approach of the following three is the better: 1) Every website will have its own seperated instance of nginx, php and mysql. The downside is, that each webserver + php has to listen to a different port. I also need a "master" nginx web server in front of them, reverse proxying to the chrooted servers behind it. Probably most secure, but also most advanced. 2) I don't make any chroot jails manually. I setup one nginx web server, that proxies php requests to php-fpm, on different ports. I can have multiple php-fpm configurations each with is own chroot'ed folder. This is quite managable - however only php will be chrooted. Not the actual webserver. Is this secure enough. Also, I tried this option out, and it seems I will need to use TCP instead of sockets for connecting to MySQL. 3) You tell me ;) I'm quite new to chroot jailing, so please correct me if I'm wrong in my assumptions. I've been reading all the tutorials I could find, however, I find the market for chroot guides very scarce. Any help or inputs much appreciated!

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• How to direct reverse proxy requests using wildcard vhosts

  - by HonoredMule

  I'm interested in running a reverse proxy with 2-3 virtual machines behind it. Each internal server will run multiple virtual hosts, and rather than manually configuring each individual vhost on the proxy (a variety of vhosts come and go too often for this to be practical), I would like to use something which can employ pattern matching in a sequential order to find the appropriate back-end server. For example: Server 1: *.dev.mysite.com Server 2: *.stage.mysite.com Server 3: *.mysite.com, dev.mysite.com, stage.mysite.com, mysite.com Server 4: * In the above configuration, task.dev.mysite.com would go to Server 1, dev.mysite.com would go to Server 3, yoursite.stage.mysite.com to Server 2, www.mysite.com to Server 3, and yoursite.com to Server 4. I've looked into using Squid, Varnish, and nginx so far. I have my opinions regarding their respective desirability and general suitability, but it's not readily apparent if any of them can handle dynamic server selection in this manner and not require per-vhost configuration. Apache on the other hand can do this handily and simply, but otherwise (aside from being well-known and familiar) seems very poorly suited to the partly-performance-serving task. Performance isn't actually a major concern yet, but it seems foolish to use Apache if another system will perform far better and can also handle the desired 'hands-free' configuration. But so is frequently having to adjust the gateway for all production services and risk network-wide outage...and so also is setting oneself up for longer downtime later if Apache becomes a too-small bottleneck. Which of these (or other) reverse proxies can do it/would do it best? And maybe I should post this as a separate question, but if Apache is the only practical option, how safe/reliable/predictable is apache-mpm-event in apache2.2 (Ubuntu 12.04.1) particularly for a dedicated reverse proxy? As I understand it the Event MPM was declared "safe" as of 2.4 but it's unclear whether reaching stability in 2.4 has any implications for the older (2.2) versions available in official/stable package channels of various distros.

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• How to handle server failure in an n-tier architecture?

  - by andy

  Imagine I have an n-tier architecture in an auto-scaled cloud environment with say: a load balancer in a failover pair reverse proxy tier web app tier db tier Each tier needs to connect to the instances in the tier below. What are the standard ways of connecting tiers to make them resilient to failure of nodes in each tier? i.e. how does each tier get the IP addresses of each node in the tier below? For example if all reverse proxies should route traffic to all web app nodes, how could they be set up so that they don't send traffic to dead web app nodes, and so that when new web app nodes are brought online they can send traffic to it? I could run an agent that would update all the configs to all the nodes, but it seems inefficient. I could put an LB pair between each tier, so the tier above only needs to connect to the load balancers, but how do I handle the problem of the LBs dying? This just seems to shunt the problem of tier A needing to know the IPs of all nodes in tier B, to all nodes in tier A needing to know the IPs of all LBs between tiers A and B. For some applications, they can implement retry logic if they contact a node in the tier below that doesn't respond, but is there any way that some middleware could direct traffic to only live nodes in the following tier? If I was hosting on AWS I could use an ELB between tiers, but I want to know how I could achieve the same functionality myself. I've read (briefly) about heartbeat and keepalived - are these relevant here? What are the virtual IPs they talk about and how are they managed? Are there still single points of failure using them?

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• Zabbix Proxy not collecting data

  - by syntaxcollector

  Hi All I have a working Zabbix 1.8.2 server collecting data for our office and our colo facility. However the link between the colo and office is flaky. What I'm trying to do is setup a proxy on the colo side to have a 1 hour cache and relay the data to our primary server at the office. Our zabbix server is compiled from source and uses a mysql database I've followed the instructions found in the zabbix documentation to compile the proxy using a sqlite3 database. I add the proxy to zabbix under Administration-DM-Proxies. The zabbix server "sees" the proxy because the "last seen" field is always under 60s. However when I assign a colo host to the proxy I stop receiving data from it. The colo host's zabbix_agentd.log file says this: 29343:20100622:124847 Timeout while answering request 29343:20100622:124847 Getting list of active checks failed. Will retry after 60 seconds The zabbix_proxy.log says this. 2041:20100622:123131.760 Deleted 0 records from history [0.000994 seconds] 2028:20100622:124131.671 Error while receiving answer from server [ZBX_TCP_READ() failed I also am unable to receive any SNMP data which is more important to me than the zabbix agent data. Has anyone had this problem before? Zabbix Server OS: CentOS5.4 Zabbix Server Build: 1.8.2 from source Zabbix Proxy OS: CentOS5.4 Zabbix Proxy Build: 1.8.2 from source P.S. The SQLite database on the zabbix proxy never gets any data written to it, it is identical to when I created it from the blank schema in zabbix-1.8.2/create/schema. (Yes I've checked the permissions)

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• Single application through OpenVPN tunnel (Debian Lenny)

  - by mikael

  I'm using Debian Lenny and I want to tunnel rtorrent only through a OpenVPN tunnel. I have a tunnel running, the config file looks like this: client dev tun proto udp remote openvpn.xxx.com 1194 resolv-retry infinite nobind persist-key persist-tun ca /etc/openvpn/xxx/keys/ca.crt cert /etc/openvpn/xxx/keys/client.crt key /etc/openvpn/xxx/keys/client.key tls-auth /etc/openvpn/xxx/keys/tls.key 1 ns-cert-type server comp-lzo verb 3 auth-user-pass script-security 3 reneg-sec 0 My idea is that I could run a sockd proxy internally that redirects traffic to the openvpn tunnel. I could use the *nix "proxifier" application "tsocks" to make it possible for rtorrent to connect through that proxy (as rtorrent doesn't support proxies). I have trouble configuring sockd as my IP inside the VPN changes every time I connect. This is a config file someone said would help: http://ircpimps.org/sockd.conf As my IP changes at each connect I don't know what to put in that config file. I have no control over the host side config file. Any help wanted. Any other method is very welcome.

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• how to design pound -> varnish -> jboss for ha + loadbalancing

  - by andreash

  Hello, I'm planning a new infrastructure for our web application. We have two JBossAS5 servers, running in a cluster. Session state will be replicated via JBoss Cache. In front of that, there should be some cache, to speed up delivery of static elements. However, most of the traffic to our app will be via HTTPS. So far, I had been thinking of two Varnish caches in front of the JBossASs, each being configured for loadbalancing to the two JBossASs via round-robin. Since Varnish doesn't handle HTTPS, then there would need to be two pound proxies in front of the Varnishs, dealing with the HTTPS. The two pounds would be made high-available with Heartbeat/LinuxHA. The traffic to www.example.com would then be going through our firewall, from there to the virtual IP of the pounds, from there to the Varnishs, and from there to the JBossASs. Question 1: Does this make sense? Or is it overly complicated, and the same goal can be reached with simpler methods? Question 2: If my layout is fine, how do I configure the pound - Varnish step? Should I a) make the Varnish service high-available through Heartbeat/LinuxHA as well and direct traffic from pound to the virtual IP of the Varnishs, or should I rather b) Configure two independent Varnishs and use load-balancing in pound to address the different Varnishs? Thanks a lot for your insight! Andreas.

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• another "SSH connect to host github.com port 22: Bad file number"

  - by Mariusz

  Hello. I have a problem with my first-time ssh connection. Yes, I've already done yours guides, already tried your "Dealing with firewalls and proxies" article and the problem is still occuring. I am using Win7 32bit, Windows Firewall is disabled, haven't any third-party firewalls, ESET Nod32 Antivirus is not blocking any ports, I am not using any PROXY (neither local proxy) . Here goes the logs: Ordinary SSH connection try C:\Users\Mariusz>ssh -vvv [email protected] OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007 debug2: ssh_connect: needpriv 0 debug1: Connecting to github.com [207.97.227.239] port 22. debug1: connect to address 207.97.227.239 port 22: Not owner ssh: connect to host github.com port 22: Bad file number NCAT connection try C:\Users\Mariusz>ncat github.com 22 Strange connect error from 207.97.227.239 (10013): No error 10013 = WSAEACCES I think that method called "smart-http-support" won't be usable for me because I haven't created repo yet. I have just GIT INIT locally, and finished at step GIT PUSH, which returns the same: ssh: connect to host github.com port 22: Bad file number fatal: The remote end hung up unexpectedly corkscrew method (first article from yours guide) . While PUTTYing (with pageant in bg), after inputing login - an error is occuring (MessageBox): Disconnected: No supported authentication methods available And in terminal such message is printing out: Server refused our key Key I have generated correctly, using ssh-keygen. I tried not method by editing ~/.ssh/config yet because I had thought that because I haven't PUSHed anything to my remote repo so I won't be able to CLONE anything. Method called ssh-forwarding is not for my, cause it "requires access to an external ssh server" and I haven't any at this time. What else could I do? Thanks in advance for any help. Mariusz.

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• Dynamic fowarding with SOCKS5 proxy [on hold]

  - by bh3244

  I'm building my own SOCKS5 client and HTTP library and am having trouble figuring out how things work with dynamic port forwarding. So far I can connect successfully with my SOCKS5 client, but from there on I am stuck. I am using the ssh -D command. Considering I have my local machine "home" and my server "server" and I wanted to use "server" as proxy for all connections I understand I would type ssh -D "localport" "serverhostname" on my local machine "home". This command I understand has ssh accept connections with the SOCKS5 protocol. So now if I want to connect to google.com(74.125.224.72:80) and issue a GET for the front page, I assume I would send the SOCKS5 client request and the server would respond back with a 0x00 "succeeded" and from then on I am connected and I would send the HTTP GET request and the server would respond back accordingly with the data. Now if I want to navigate to a different website, must I issue another SOCKS5 connection request for that sites IP/hostname? I'm confused if this is the way it is done, or if there is a program listening on the local port of the "server" and handling outgoing and incoming data. To reiterate: Do SOCKS5 proxies work by sending repeated SOCKS5 connection requests for different addresses or is there just one connection to a local port on "server" and another program on "server" handles the outgoing connection to the internet by using that local port to send and receive data to/from "home"?

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• apache 2.4, mod_proxy_fcgi not honouring .htaccess, work around needed

  - by user229874

  I am using apache 2.4.7 with mod_proxy_fcgi for purpose of passing through php to php-fpm (this will be used for shared hosting environment). The htaccess works fine for non php files, but once it hit rewrite rule that proxies through the php requests, the htaccess is ignored. I know why it is happening. The question is: how do I work around it? The question how do I force apache to treat the request to php file as a request to local file, and then proxy it through? I have spent substantial time in researching on this problem, and following "answers" were given as solution: 1) "use apache configuration instead of .htaccess" it is valid solution, but not for shared hosting environment (I am not going to give access to apache configuration to shared hosting customers ;)). 2) "don't use .htaccess, as it has performance/security/other issues", well how else would shared hosting customers control access/url rewriting on their site? Besides if the .htaccess was not a requirement I would simply use nginx. 3) "put rewrite rule for proxy inside of " - this is incorrect, and it does not work. This behaviour appears to be not a bug but a "feature" as per https://issues.apache.org/bugzilla/show_bug.cgi?id=54887

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• eXist-db: can't start webstart client on a closed port, reverse proxied via apache

  - by rvdb

  I am configuring an Apache HTTP server so it reverse proxies requests starting with /app/ to an eXist-db instance running in a Tomcat server, on port 8082. This port has been closed in the firewall and is inaccessible to the outer world. Following the eXist documentation, I have following rules in place in my httpd.conf file: ProxyPass /apps/ http://localhost:8082/ ProxyPassReverse /apps/ http://localhost:8082/ ProxyPassReverseCookiePath /apps/ / All goes well for requests to e.g. 'http://mydomain/apps/exist/index.xml'. Yet, the webstart client (accessible at 'http://localhost:8082/exist/webstart/exist.jnlp' on the web server) doesn't work behind the proxy. While 'http://mydomain/apps/exist/webstart/exist.jnlp' does generate a valid exist.jnlp file, that file can't be executed. The reason seems quite obvious: apparently, the eXist-db instance generating the exist.jnlp file only sees the proxied request as: 'http://localhost:8082/exist/webstart/exist.jnlp'. Yet, since the exist.jnlp file is executed on the client, that reference is meaningless (unless the client computer happens to have an eXist-db instance running on that port). Executing the exist.jnlp file hence fails with a 'connection refused' error. Yet, there's no problem at all connecting a local eXist-db Java client to the proxied eXist instance with the URL xmldb:exist://mydomain/apps/exist/xmlrpc. The problem lies in generating the webstart exist.jnlp file, which seems to need access to a publicly accessible URL. However, opening port 8082 and replacing the Proxy references to 'http://localhost:8082' with 'http://mydomain:8082' IMO rather destroys the point of reverse proxying. Do others have had success reverse proxying eXist-db on a closed port behind Apache? Are there perhaps some Proxy configuration settings I have overlooked (I'm no expert at all) that can make eXist see the original request instead of the proxied one? Kind regards, Ron

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• Apache2 - Hosting two sites on the same domain with different ports

  - by user1026361

  I am hosting a staging site (test.mydomain.com) which currently work well on port 80 for two sites (test.mydomain.com and test.FRmydomain.com) I am working on a new backend and I would like to deploy a third site on this server for testing. My hope is that it will live at test.mydomain.com:4204. I've got some experience with apache and quickly added statements: Listen 4204 NameVirtualHost *:4204 and created a new config for my site. What I imagine are the relevant parts of my config: <VirtualHost *:4204 > ServerAdmin [email protected] ServerName test.mydomain.com:4204 However, the site is not publicly available, by name or ip. If i curl localhost:4204 from the server, I get the expected page content At this point, I'm a bit of a loss on how to go forwards. It seems like my config is correct but not available to be served. Am I better off defining a proxy definition so that, for instance: test.mydomain.com/4204 proxies to my localhost server or is there a way to make the site available via the internet? EDIT: I have added an iptable rule after further Googling with the command: iptables -I INPUT -p tcp --dport 4204 -j ACCEPT I can see apache listening on 4204 and the rule is definitely in place but cant reach the site

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• Requests per second slower when using nginx for load balancing

  - by Ed Eliot

  I've set up nginx as a load balancer that reverse proxies requests to 2 Apache servers. I've benchmarked the setup with ab and am getting approx 35 requests per second with requests distributed between the 2 backend servers (not using ip_hash). What is confusing me is that if I query either of the backend servers directly via ab I get around 50 requests per second. I've experimented with a number of different values in ab the most common being 1000 requests with 100 concurrent connections. Any idea why traffic distributed across 2 servers would result in fewer requests per second than hitting either directly? Additional info: I've experimented with worker_processes values of between 1 and 8, worker_connections between 1024 and 8092 and have also tried keepalive 0 and 65. My main conf currently looks like this: user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; worker_rlimit_nofile 8192; events { worker_connections 2048; use epoll; } http { include /etc/nginx/mime.types; sendfile on; keepalive_timeout 0; tcp_nodelay on; gzip on; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } I've got one virtual host (in sites available) that redirects everything under / to 2 backends across a local network.

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• Proxy auto-config dnsResolve doesn't seem to resolve subdomains

  - by HorusKol

  We're running on a Windows domain, and have a DNS to control computer names on our intranet. The following PAC works great for basic hostnames on our intranet - but we're setting up some subdomain-like names (example, redesign.buildbox), and it isn't resolving these. These subdomains are resolvable through other means (such as nslookup). Other than checking to see if the host has ".buildbox" or other domain, is there a way to make it work? Maybe I could try appending the Windows domain to host (can you concatenate strings in a PAC)? function FindProxyForURL(url, host) { // If IP address is internal or hostname resolves to internal IP, send direct. var resolved_ip = dnsResolve(host); if (isInNet(resolved_ip, "129.2.2.0", "255.255.255.128")) return "DIRECT"; if (isInNet(resolved_ip, "10.1.1.0", "255.255.255.0")) return "DIRECT"; if (isInNet(resolved_ip, "150.1.2.0", "255.255.255.248")) return "DIRECT"; // All other traffic uses below proxies, in fail-over order. return "PROXY 192.111.222.111:8080; DIRECT"; }

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• Custom Domain for Google App Engine and Google Apps

  - by Kevin

  I have set up and configured Google App Engine and Google Apps to use my custom domain with a cname 'www'. I have configured my DNS (via fasthosts.co.uk) with the cname and pointed it to ghs.google.com. I can access the website using the google app engine domain at capel-y-crwys.appspot.com but I can't access it via my custom domain www.capelycrwys.org.uk. I have allowed several days for propagation of the DNS etc. The really strange this is I can access the app via my custom domain when I use the web browser on my Android mobile phone. I can't access the app via my custom domain from my home internet connection, my work internet connection or a friends internet connection. I tried a few online web proxies and I can access the app via the custom domain. I posted this question on the google forums code.google.com/appengine/forum/?place=topic%2Fgoogle-appengine%2FfUP-G_0FKE4%2Fdiscussion and a commentor has said he could access the app via the custom domain. So why can't I access it direct via my home internet connection etc? I've tried loads of google searching and even found a similar sounding post here on serverfault serverfault.com/questions/208461/custom-domain-name-server-not-found-google-app-engine-and-google-apps but it doesn't have an answer that helps me.

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• How can I setup a Proxy I can sniff traffic from using an ESX vswitch in promiscuous mode?

  - by sandroid

  I have a pretty specific requirement, detailed below. Here's what I'm not looking for help for, to keep things tidy and on topic: How to configure a standard proxy Any ESX setup required to facilitate traffic sniffing How to sniff traffic Any changes in design (my scope limits me) I need to setup a test environment for a network-sniffing based HTTP app monitoring tool, and I need to troubleshoot a client issue but he only has a prod network, so making changes to the config on client's system "just to try" is costly. The goal here is to create a similar system in my lab, and hit the client's webapp and redirect my traffic - using a proxy - into the lab environment. The reason I want to use a proxy is so that only this specific traffic is redirected for all to see, and not all my web traffic (like my visits to serverfault :P). Everything will run inside an ESX 4.1 machine. In there, there is a traffic collection vswitch in promiscuous mode that is not on the local network for security reasons. The VM containing our listening agent is connected to this vswitch. On the same ESX host, I will setup a basic linux server and install a proxy (either apache + mod_proxy or squid, doesn't matter). I'm looking for ideas on how to deploy this for my needs so I can then figure out how to set it up accordingly. Some ideas I've had were to setup two proxies, and have them talk to eachother through this vswitch in promiscuous mode, but it seems like alot of work. Another idea is a dual-homed proxy, but I've never seen/done that before so I'm not sure how doable it is for what I'd like. I am OK with setting up a second vswitch in promiscuous mode to facilitate this if need be, but I cannot put the vswitch on the lan (which is used so my browser would communicate with the proxy) in promiscuous mode. Any ideas are welcome.

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