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• Is there any way to set up a malware-blocking transparent proxy on an Airport Extreme?

  - by Chris R

  I'd like to add some kind of easily-administered transparent HTTP proxy to my home network. Ideally, it would allow me to, for example, redirect web requests to blacklisted servers into nothing, block certain kinds of content, et al. My home network at the moment consists of a mac mini media server that could -- if the load wasn't huge -- fill this role as well, an Airport Extreme, and a mac laptop that is my main machine. I'm reasonably technically savvy, so don't spare the complicated answers.

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• How to get Microsoft Security Essentials to work through a proxy?

  - by Simon

  It only seems to work for me with a direct connect. And i cant find anywhere to set a proxy. Windows 7 64bit.

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• suggestions for fast reliable proxy IPs like codeen but with posting?

  - by barlop

  Hi, I am looking for a list like one offered by codeen http://codeen.cs.princeton.edu/ of fast reliable proxy servers.. I just want to be able to "post" on usenet or yahoo groups with them.. I think the codeen ones don't allow HTTP-POST I don't need them for downloading or for torrents, or even for any images.. they can block images to keep browsing faster. I know it's not a list, but I did try TOR once, but it was horribly slow.

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• What is the difference between Load Balancer and Reverse Proxy?

  - by Morgan Cheng

  I'm not clear about the difference between Load Balancer and Reverse Proxy. They both seems having same behavior: distributing incoming requests to backend servers.

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• mod_usertrack with X-Forwarded-For (proxy) IPs, apache 2.2

  - by ripper234

  I'm using apache 2.2 with mod_usertrack, behind a reverse proxy (load balancer). Now, the proxy disguises the client's real IP addresses (keeps them in the X-Forwarded-For header), and forwards the request along. mod_usertrack uses the clients' IP (along with some noise) to generate a GUID for each client. However, because of the proxy, it only sees a single IP and the generated GUIDs for each client are very similar (even with some possible collisions). I would like to upgrade apache to version 2.4, but it seems to be somewhat of a project. I did manage to compile it using this post and a few others, only to discover the folder structure does not resemble the one I had before (default ubuntu). I'm weary of tweaking it myself ... and I will be making my life miserable if I want to upgrade the server later on. So ... what are my options? Is there a good unofficial repository that packages apache 2.4 for Oneiric? (please provide a short 'how to', I'm not great in installing packages) Is there an alternative route to solve this? (Upgrading just the user_track module? Another module that works with apache 2.2?)

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• Dropped connections between Linux Servers in Data Center

  - by Emil H

  I have a number of linux servers at a us-based datacenter. The servers were installed by the hosting company, and are running fedora core. We're experiencing problems with dropped connections. The issue seems to be that when we attempt to connect to one of the other servers after a period of inactivity, the first connection attempt will fail, and sometimes the second. However, after that the connection succeds and it works for a while. This happens for both mysql connections and raw socket connections, but only seems to occur when connecting to some of our servers. The confusing part is that it some of the servers for which we see different behaviors have identical hardware configuration and software. For example, it happens when connecting to a server called mysql2, but not for a server called mysql3. These servers were installed at the same time, but the same specifications. The problem can be reproduced somewhat reliably, but only after waiting fifteen minutes to half an hour. This makes it hard to diagnose, and even harder since I'm not really sure what to look for. I realize that connections sometimes failed, and that we should write our applications to compensate for this but these servers all in the same data center. Why would it matter if two servers haven't communicated for a while? Does anybody have an idea what might be causing this? Is it a server configuration problem or a network problem that I should contact the hosting company about. What do I tell them to look for? Unfortunately our experience has been that the support staff doesn't investigate problems in depth unless we give them detailed directions.

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• ARM TechCon 2013: Oracle, ARM expand collaboration on servers, Internet of Things

  - by Henrik Stahl

  If you have been following Java news, you are already aware of the fact that there has been a lot of investment in Java for ARM-based devices and servers over the last couple of years (news, more news, even more, and lots more). We have released Java ME Embedded binaries for ARM Cortex-M micro controllers, Java SE Embedded for ARM application processors, and a port of the Oracle JDK for ARM-based servers. We have been making Java available to the Beagleboard, Raspberry Pi and Lego Mindstorms/LeJOS communities and worked with them and the Java User Groups to evangelize Java as a great development environment for IoT devices. We have announced commercial relationships with Freescale, Qualcomm, Gemalto M2M, SIMCom to name a few. ARM and Freescale on their side have joined the JCP, recently been voted in as members of the Executive Committee, and have worked with Oracle to evangelize Java in their ecosystem. It is with this background, Nandini Ramani, Vice President, Java Platform at Oracle, announced a expanded collaboration with ARM in a TechCon 2013 keynote titled "Enabling Compelling Services for IoT". To summarize the announcement: ARM and Oracle will work together on interoperability between the ARM Sensinode communications stack (based on CoAP, DTLS and 6LoWPAN) and Oracle's Java ME, Java SE and middleware products. ARM will donate the Sensinode CoAP protocol engine to OpenJDK to stimulate broad adoption of the CoAP protocol, and work with Oracle to extend the relevant Java specifications with CoAP support. CoAP (Constrained Application Protocol) is an IETF specification that provides a low-bandwidth request/response protocol suitable for IoT applications. ARM will work with Oracle and Freescale to enable the mbed Hardware Abstraction Layer (HAL) to act as a portability layer for Java ME Embedded. Oracle will enable mbed as a tier one platform for Java ME Embedded. Over time, this effort will allow any mbed-enabled platforms (mostly based on Cortex-M microcontrollers) to work with off the shelf Java ME Embedded binaries, extending the reach of Java ME into IoT edge nodes. In Nandini's keynote, Oracle showed a roadmap to port the Oracle JDK for Linux on 64-bit ARMv8 servers in the 2015 time frame, preceded by an extended early access program. We expect this binary to have full feature parity with Oracle JDK on other platforms, and be available under the same royalty-free license. This effort has been going on for some time, but is now accelerated due to availability of hardware from Applied Micro. Oracle will be working with Applied Micro on the ARMv8 port, and on optimizing Java for their X-Gene products. Oracle and ARM will work closely on IoT architecture, and on evangelizing Java on ARM for both servers and IoT devices. These announcements reinforce Java's position as a first-class citizen in the ARM ecosystem, and signal a commitment from us to collaborate on driving standards and open ecosystem for the Internet of Things. If you are active in this area and not already in touch with us, or interested in learning more - please reach out to us!

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• How to Name Linked Servers

  - by Bill Graziano

  I did another SQL Server migration over the weekend that dealt with linked servers.  I’ve seen all kinds of odd naming schemes and there are a few I like and a few I suggest you avoid. Don’t name your linked server for its IP address.  At some point whatever is on the other end of that IP address will move.  You’ll probably need to point your linked server to a new IP address but not change the name of the linked server.  And then you’ve completely lost any context around this.  Bonus points if a new SQL Server eventually ends up at the old IP address further adding confusion when you’re trying to troubleshoot. Don’t name your linked server based on its instance name.  This one is less obvious.  It sounds nice to have a linked server named [VSRV1\SQLTRAN01].  You know what it is and it’s easy to use.  It’s less nice when you’ve got 200 stored procedures that all reference this linked server but the database they reference has moved to a new instance.  Now when you query this you’re actually querying a different instance. (Please note: I’m not saying it’s a good idea to have 200 stored procedures that all reference a linked server.  I’m just saying it’s not all that uncommon.) Consider naming your linked server something that you can easily search on.  See my note above.  You can also get around this by always enclosing the name in brackets.  That is harder to enforce unless you use some odd characters in it. Consider naming your linked server based on the function.  For example, I’ve had some luck having a linked server named [DW] that points to our data warehouse server.  That server can change names or physically move and all I need to do is update the linked server to point to the new destination.  The descriptive name of the linked server is still accurate.  No code needs to change and people still know what it is just by looking at it. Consider naming your linked server for the database.  I’m still thinking through this one.  It may mean you have multiple linked servers that point to the same instance.  I’ve found that database names rarely change.  It also makes it easier to move individual databases to new servers. Consider pointing your linked servers to DNS entries and not IP addresses.  I’ve done this for reporting databases and had some success.  Especially for read-only snapshots that can get created on the main database or on the mirror.  What issues have you had with linked server names?  What has worked for you?  Where are the holes in my approach?

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• Command-line to list DNS servers

  - by Anurag Uniyal

  Is there a command to list dns servers? I tried $ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 127.0.0.1 $ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback But it doesn't list any servers, if I go to "Network GUI Tool", in Wireless section it lists "DNS 192.168.1.1 8.8.8.8 8.8.4.4" Can I get same information from command line? I am using Ubuntu 12.04 LTS

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• Synchronise Database between servers via php [closed]

  - by Emmanuel

  Hi Guys, I'm needing to synchronise two mysql databases between different servers on a regular basis, by a client-initiated interface. I've been doing it by remote MYSQL connection, and adding the IP of the servers to the whitelist for MYSQL remote connections. Problem is however, that the client has a dynamic IP, so as soon as it changes they can no longer sync. So I'm trying to find an alternative way of synchronising the two databases via some sort of secure php script.

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• IT Buying More x86 Servers, Paying Less: IDC

  Sales of x86 servers are taking off like a shot, RISC is shriveling up, and prices are still dropping as IT buyers snap up less-expensive servers.

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• Socks proxy on mac's shared internet

  - by AliBZ

  Hi all I use my mac's internet sharing to create wireless network for my ipod touch. I have a linux server and I use socks proxy. I wanna use this proxy on my ipod but i don't know how. I put my shared network connection behind the proxy with localhost ip but my ipod isn't behind the proxy. any ideas?

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• Why does using nginx as a reverse proxy break local links?

  - by tsvallender

  I've just set up nginx as a reverse proxy, so some sites served from the box are served directly by it and others are forwarded to a Node.js server. The site being served by Node.js, however, is displayed with no CSS or images, so I assume the links are somehow being broken, but don't know why. The following is the only file in /etc/nginx/sites-enabled: server { listen 80; ## listen for ipv4 listen [::]:80 default ipv6only=on; ## listen for ipv6 server_name dev.my.site; access_log /var/log/nginx/localhost.access.log; location / { root /var/www; index index.html index.htm; } location /myNodeSite { proxy_pass http://127.0.0.1:8080/; proxy_redirect off; proxy_set_header Host $host; } } I had thought perhaps it was trying to find them in /var/www due to the first entry, but removing that doesn't seem to help.

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• How do you cache web pages with a personalized header using caching reverse proxy such as Squid, Var

  - by Continuation

  Pretty much every page of my website is dynamically generated. However they don't change that frequently (kinda similar to a forum page). So I'd like to cache them using a caching reverse proxy such as Squid, varnish or Nginx. The problem is that for my logged-in users, each of them will see a personalized header saying "Welcome John Doe. Logout" on the upper right corner of the page (just like serverfault). While users who aren't logged in will see a header that says "Login" instead. So basically even though every user will see the same page in general, they all slightly different version due to that personalized header. Is there any way so that I can cache the "main" part of the page and serve it from cache while generate the personalized header dynamically for each individual user? This must be a very common problem. How is it solved in general?

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• How to use iptables to foward outbound web traffic to a proxy?

  - by jnman

  I've been hitting my head for a while as to how to do this. The scenario is as follows: I want to be able to forward all outbound web traffic from a browswer to Tor so that it is properly anonymized. Normally, one could just set the http proxy in the browser and be done with it but this is with a browser without the ability to do so specifically, a mobile browser. So ideally, what could be done then is to intercept all web/dns traffic requests from the browser and send it to Tor. Assume for this, that Tor will be running on the device too.

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• How to invalidate nginx reverse proxy cache in front of other nginx servers?

  - by Olivier Lance

  I'm running a Proxmox server on a single IP address, that will dispatch HTTP requests to containers depending on the requested host. I am using nginx on the Proxmox side to listen to HTTP requests and I am using the proxy_pass directive in my different server blocks to dispatch requests according to the server_name. My containers run on Ubuntu and are also running a nginx instance. I'm having troubles with caching on a particular website that is fully static: nginx keeps on serving me stale content after files updates, until I: Clear /var/cache/nginx/ and restart nginx or set proxy_cache off for this server and reload the config Here's the detail of my configuration: On the server (proxmox): /etc/nginx/nginx.conf: user www-data; worker_processes 8; pid /var/run/nginx.pid; events { worker_connections 768; # multi_accept on; use epoll; } http { ## # Basic Settings ## sendfile on; #tcp_nopush on; tcp_nodelay on; #keepalive_timeout 65; types_hash_max_size 2048; server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; client_body_buffer_size 1k; client_max_body_size 8m; large_client_header_buffers 1 1K; ignore_invalid_headers on; client_body_timeout 5; client_header_timeout 5; keepalive_timeout 5 5; send_timeout 5; server_name_in_redirect off; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; gzip_vary on; gzip_proxied any; gzip_comp_level 6; # gzip_buffers 16 8k; gzip_http_version 1.1; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; limit_conn_zone $binary_remote_addr zone=gulag:1m; limit_conn gulag 50; ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } /etc/nginx/conf.d/proxy.conf: proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_hide_header X-Powered-By; proxy_intercept_errors on; proxy_buffering on; proxy_cache_key "$scheme://$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=cache:10m inactive=7d max_size=700m; /etc/nginx/sites-available/my-domain.conf: server { listen 80; server_name .my-domain.com; access_log off; location / { proxy_pass http://my-domain.local:80/; proxy_cache cache; proxy_cache_valid 12h; expires 30d; proxy_cache_use_stale error timeout invalid_header updating; } } On the container (my-domain.local): nginx.conf: (everything is inside the main config file -- it's been done quickly...) user www-data; worker_processes 1; error_log logs/error.log; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; #tcp_nopush on; keepalive_timeout 65; gzip off; server { listen 80; server_name .my-domain.com; root /var/www; access_log logs/host.access.log; } } I've read many blog posts and answers before resolving to posting my own questions... most answers I can see suggest setting sendfile off; but that didn't work for me. I have tried many other things, double checked my settings and all seems fine. So I'm wondering whether I am not expecting nginx's cache to do something it's not meant to...? Basically, I thought that if one of my static files in my container was updated, the cache in my reverse proxy would be invalidated and my browser would get the new version of the file when it requests it... But I now have the sentiment I misunderstood many things. Of all things, I now wonder how nginx on the server can know about a file in the container has changed? I have seen a directive proxy_header_pass (or something alike), should I use this to let the nginx instance from the container somehow inform the one in Proxmox about updated files? Is this expectation just a dream, or can I do it with nginx on my current architecture?

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• How to rewrite the domain part of Set-Cookie in a nginx reverse proxy?

  - by Tobia

  I have a simple nginx reverse proxy: server { server_name external.domain.com; location / { proxy_pass http://backend.int/; } } The problem is that Set-Cookie response headers contain ;Domain=backend.int, because the backend does not know it is being reverse proxied. How can I make nginx rewrite the content of the Set-Cookie response headers, replacing ;Domain=backend.int with ;Domain=external.domain.com? Passing the Host header unchanged is not an option in this case. Apache httpd has had this feature for a while, see ProxyPassReverseCookieDomain, but I cannot seem to find a way to do the same in nginx.

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• DNS Spoofing and Xampp as a proxy, how to configure it?

  - by Angelo

  I have a server running Apache with mod_proxy, a module to use my localhost as a proxy server. When somebody on the same LAN visits my server (my localhost through my lan ip), he/she can see only the .html page loaded into my server. Due to DNS Spoofing restrictions on the client, if he/she clicks on a link that refers to something not on my server, Apache says correctly "Object not found", because the client cannot request the page from the Internet (remember, the DNS is spoofed to my localhost). The question is: how to configure Apache to grab the page in place of the client?

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• Can I proxy my no-ip domain using a .htaccess file on my hosted domain?

  - by Dean

  I have a domain http://www.example.com which has a hosting package and website on it. I also have a http://example.no-ip.org domain which contains some content I would like to appear under the same domain. Can I setup a .htaccess file at http://www.example.com/proxy/ which proxies the files at http://www.example.no-ip.org/files/ Similarly, could I host an entire domain in the same way?, e.g. http://www.example2.com/ proxying http://example.no-ip.org/files2/ Alternatively, if someone were to say "That's stupid, use this free (or super-cheap) dynamic DNS host:" I would probably accept that answer.

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• How to configure Apache to act as an SSL proxy to an application server?

  - by ripper234

  I have one physical server that runs: an Apache (httpd) server another web server (let's say Tomcat for sake of argument) on port 1234 Can I configure the Apache server to act as a proxy for SSL traffic, while keeping the application server blissfully unaware of SSL? What I imagine is: Traffic to http://myserevr.com/app is redirected to https://myserver.com/app Traffic to https://myserver.com/app is proxied to the application server. My SSL certificate is only installed on the Apache server, not on the Application server Other traffic to the Apache server (http://myserver.com/anotherapp) is served directly from the Apache server What's the best setup to achieve this? (On Ubuntu, if that matters)

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• How to redirect a specific url through a proxy for multiple services?

  - by CrystalFire

  I have a website hosted on 000webhost.com for free. I am unable to connect directly to the site because Comcast has blocked a portion of 000webhost's servers for free accounts due to other people hosting malicious content. In order to maintain my website, I cannot use my computer to directly connect to the server. I am wondering if there is a way by which I can specifically forward attempts to access the server through a proxy, transparently. The current system that I am on is Windows, but I also have systems running Mac OSX and Linux, so solutions for any system could be fine. I've found answers which work for http, but I'm looking for a solution which will let me use all the other functions as well, such as ftp and ssh.

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• Ubuntu One Windows Client 3.0.1 - Sync not connecting

  - by Tweezak

  I've got sync working at home on Natty and I need to access files at work. I've just installed client 3.0.1 at work on Windows 7. It's finding my account and sees what devices are already set up for sync but it just repeatedly tries to sync (File sync starting...) and after a while fails (File Sync is disconnected.). This cycle loops endlessly. I'm suspicious that it's a problem with my proxy setup. My employer doesn't use a manual proxy configuration but instead uses an automatic configuration script at a specific http address. Does U1 recognize that kind of setup or is it only looking for a proxy server in the form of an address/port?

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• Reverse proxying only a specific URL

  - by Bart Silverstrim

  I have a web server at www.ourcompany.com running Apache2. Using the proxy modules, I am able to (for example) get 172.16.0.5, an internal IP device, to be accessed on www.ourcompany.com/device. The trouble is that anyone can play with or explore the device using strings sent to www.ourcompany.com/device/change/settings/here.html. I'd like the reverse proxy to only work for a specific URL; www.ourcompany.com/device/you/must/use/this while anything else will be rejected if requested. Is there a setting that can be used to do this, or is it a simple rewrite condition placed in the virtualhost for the site under sites-enabled? What is the simplest, most maintainable way to sanitize requests to the internal device through the reverse proxy? Running Apache2 on Ubuntu.

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• How to exclude a specific URL from basic authentication in Apache?

  - by ripper234

  Two scenarios: Directory I want my entire server to be password-protected, so I included this directory config in my sites-enabled/000-default: <Directory /> Options FollowSymLinks AllowOverride None AuthType Basic AuthName "Restricted Files" AuthUserFile /etc/apache2/passwords Require user someuser </Directory> The question is how can I exclude a specific URL from this? Proxy I found that the above password protection doesn't apply to mod_proxy, so I added this to my proxy.conf: <Proxy *> Order deny,allow Allow from all AuthType Basic AuthName "Restricted Files" AuthUserFile /etc/apache2/passwords Require user someuser </Proxy> How do I exclude a specific proxied URL from the password protection? I tried adding a new segment: <Proxy http://myspecific.url/> AuthType None </Proxy> but that didn't quite do the trick.

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• Configure Postfix to use external MX servers for delivery of local mail if user is unknown

  - by mr.b

  I have a following setup: linux box with postfix configured to be responsible for example.com domain domain's MX servers are configured so that mail sent to example.com is sent to google mail servers several user accounts on linux machine exist (same machine also hosts example.com site) When someone from the outside attempts to send mail to address ending with @example.com, it gets routed to google mail (and there handled appropriately). When linux machine tries to send mail to outside world, mail is delivered correctly, as reverse dns and spf records are configured correctly, so linux machine is valid mail sender for example.com domain (along with google mail servers). However, here's the problem. When php application (hosted at linux box) tries to send mail to [email protected] (and someuser doesn't exist on linux box), it fails, since it doesn't even consult google mail servers, but postfix smtp locally concludes that "someuser" is unknown. So, the question is: how do I tell postfix to relay mails sent to @example.com domain to google mail servers (so, to servers specified in MX records), IF and only if a mailbox is not found locally.

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