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• Windows Server 2008 network speed slow, Xen 3.4.3 HVM ISO

  - by Elliot.Bradshaw

  I've setup a VM running Windows Server 2008 on a host node running Xen 3.4.3-5 and the following kernel: 2.6.18-308.1.1.el5xen #1 SMP Wed Mar 7 05:38:01 EST 2012 i686 i686 i386 GNU/Linux The network speed on the VM is very slow--using the online speed tests I can only get it up to 8-9mbps. The line is 100mbps burstable and the host node has no problem achieving those speeds. If it setup a VM running CentOS, it too has no problems achieving those speeds. I've done some pretty exhaustive troubleshooting, but nothing has helped: New VM installations of Win2k8 do have the same network problem. Upgrading to most recent kernel-xen did not help (2.6.18-308.1.1.el5xen). Upgrading from xen 3.4.0 to xen 3.4.3-5 did not help. Disabling Windows firewall, etc did not help. Changing network card device config from auto negotiation to manually be 100mbps full duplex did not help. Changing the network receive buffer packet size did not help (tried all combos from 64k to 8k). At this point I'm pretty much out of ideas--any help would be appreciated!

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• Changing IP address in IIS for SharePoint site results in Directory listing error

  - by Dan

  I have a server here that has 2 roles. One is Exchange 2007 and the other is MOSS 2007. In IIS i have a site, go.domain.com which has our OWA. The other is internal.domain.com which is the MOSS site. I have given the NIC local IPs and each site is using host headers. The GO site has an SSL cert from NetSol, and the MOSS site has a self signed. Right now going to either shows the NetSol site, which browsers complain about when going to the internal.domain.com site, obviously, since they are on the same IP in IIS. Both sites have always run off the original IP of 10.0.0.3 in IIS. When i added the second IP to the NIC, (10.0.0.6) and changed the Sharepoint site in IIS to use this for http and https access, I now get this message in a browser when trying to connect. Directory Listing Denied This Virtual Directory does not allow contents to be listed. Changing the IP back to 10.0.0.3 and the internal site is back up. What am I missing here? Do i need to fool around with Alternate Access Mappings in Central Admin? Am i completely missing the point with multiple SSL certs and host headers?

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• fail2ban log parsing too slow on Raspberry Pi - options? [migrated]

  - by Gordon Morehouse

  I'm running fail2ban on a Raspberry Pi at 950MHz which I cannot overclock further. The Pi is occasionally subject to SYN floods on particular ports. I've set up iptables to throttle the rate of SYNs on the port of interest; when the throttle limits are exceeded, hosts which send SYNs are dropped into the REJECT chain and the particular SYN packet which exceeded the limit is logged. fail2ban then watches for these logged SYNs and, after seeing a few, temporarily bans the host for a short time (this is a transient issue in the app I'm working with). The problem is that the SYN floods can occasionally reach rates which are too fast for fail2ban to keep up with; I'll see 20-40 log messages per second, and eventually fail2ban falls behind and becomes ineffective. To add insult to injury, it continues consuming a LOT of CPU as it tries to catch up. I have verified that DROP chained packets from hosts already banned by fail2ban are not logged, and thus do not add to its load. What are my options here? I have a few ideas, but no clear path forward. Could I make the log-parse regex "easier" so it takes fewer cycles? Would using iptables --log-prefix to put a token near the start of the log message, and/or otherwise simplifying/altering the fail2ban regex help? Here is the current fail2ban config line containing a regex: failregex = kernel:.*?SRC=(?:::f{4,6}:)?(?P<host>[\w\-.^_]+) DST.*?SYN Is there a faster way for fail2ban to watch for the packets exceeding the limits than parsing kern.log? Could fail2ban be run under PyPy instead of CPython with minimal nonstandard wizardry (the OS is Raspbian 7, so, mostly Debian 7)? Is there something better than fail2ban that I could use to watch for the packets which exceed the SYN limits, and after N exceeds in X seconds, temporarily put the offending IP into the iptables DROP bucket, and take it out when the ban timer expires? Again, I'd vastly prefer a solution that uses as much software available in Debian as possible, though I can build Debian packages in a pinch.

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• Canonical Redirect on Dynamic Mass Virtual Hosts on Apache

  - by Josh

  I have a Web app on Apache that allows users to point their domain to the server. Right now I'm using Apache's dynamic mass virtual hosts with an entry VirtualDocumentRoot /www/hosts/%0/docs So with www.companydomain.com it points to /www/hosts/www.companydomain.com/docs The problem is when the user goes to companydomain.com it will point to /www/hosts/companydomain.com/docs Is there an easy way to automatically have Apache check to see if a directory exists for the virtual host, and if not, look for the host name with "www." in front of it? Other subdomains are fine (i.e. abc.domain.com should point to a diff. directory than def.domain.com) but the whole "www" issue is a mystery to me. I am using dynamic mass virtual hosts so the server does not have to restart after each registration for the application. If there is a different way that is fine as long as apache isn't restarted each time. How can I accomplish this? Worst case scenario if there were a way to redirect to a "default" location on the server if not found I could always do a check via PHP or something but I feel like that is a bit hacked together and there has to be a more efficient way. Thanks in advance!

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• Windows 8 & Hyper-V Can't Bridge Wifi Connection

  - by xinunix

  So I have an odd issue that I can't quite figure out... I am running Windows 8 Enterprise on a Dell 6420 laptop. I have a Broadcom 802.11n wireless adapter. I am connected to an home router (Netgear WNDR3700) that is connected to the internet. It is a very simple home network setup. I am trying to stand-up a few VMs in Hyper-V and want the VMs to be able to access the internet over my wireless connection. I have found numerous examples of how to set this up using both External and Internal Virtual Switches but have yet to be able to get it to work on my machine. I have narrowed the issue down to the fact that my host machine always loses internet connection when I bridge my wifi connection (both when it is bridged automatically by windows when I setup an external virtual switch bound to the wifi adapter or if I do it manually by creating an internal virtual switch, right click on it and my wifi network and select "Bridge Connections".) In both cases after the bridge is established, my host machine can no longer connect to the internet. I am not sure where to start with troubleshooting this problem. After the bridge is setup, an ipconfig shows all netowrk devices on the machine as "Media Disconnected". I do know that the wireless adapter is connected to the router b/c it shows the connection as active and full-strength. The only thing I can possibly think of is that this machine also has the Cisco VPN client installed on it which installs a Cisco Virtual Network Adapter. Is it possible that this Cisco Virtual Adapter is causing me issues when I try to bridge? I saw some people had a similar issue with a VirtualBox virtual adapter when trying to share via Hyper-V. Any thoughts or suggestions on how to troubleshoot?

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• WAMP starts Apache or Mysql, but not both?

  - by ladenedge

  When I install WAMP, the Apache and Mysql services are set to run as the LocalService user and all works well. However, because I need to access remote UNC paths in my PHP code, I need to run at least Apache as a user that exists on both the local host and the remote host - I'll call him WampUser. When both Apache and Mysql are set to start as WampUser, I cannot start both at the same time. If both are stopped, I can start either successfully. When I attempt to start the other, I get Error 1053: The service did not respond to the start or control request in a timely fashion. This error appears immediately - there is no timeout. When at least one of the services is set to start as LocalService, both start fine. I can, therefore, solve my problem by setting Apache to WampUser and Mysql to LocalService, but I'm more interested in why this is happening in the first place. I'm especially curious because this situation does not occur on other servers - something I've done to this server has made these two services exclusive when running as the same user. Here are some miscellaneous data points: I am using Windows Server 2003. I've provided recursive Full Control to the C:\wamp directory for WampUser. Nothing appears in the event log after the service fails. No log entries appear in either the Mysql log or the Apache error log. Neither application appears in the process list when the appropriate service is stopped. Any ideas?

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• Change the default route without affecting existing TCP connections

  - by Patrick Horn

  Let's say I have two public network addresses on my server: one NAT through an ISP (192.168.99.0/24), and a VPN through a different ISP (192.168.1.0/24), already configured with a per-host route to the VPN server through my ISP. Here is my initial routing table. I am currently routing through my ISP on subnet 192.168.99.0/24. $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.99.1 0.0.0.0 UG 0 0 0 eth1 55.66.77.88 192.168.99.1 255.255.255.255 UGH 0 0 0 eth1 192.168.99.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 tap0 Now, I want new TCP connections to switch to my 192.168.1.0/24 so I type the following: $ route add -net 0.0.0.0 gw 192.168.1.1 dev tap0 When I do this, it causes some long-standing TCP connections to hang. Is there a way to I safely change the default interface for new connections, while allowing existing TCP connections to use the old route (i.e. do I need enable some sort of stateful routing table)? I am okay with a solution that only works with established TCP connections, and I don't care how hacky it is. For example, if there is a way to add temporary iptables rules for existing connections to force them over the old route. But there has to be some way to do this. EDIT: Just a note about a simple "route add -host ... " for existing connections: this solution would work if I am fine with leaving a subset of IPs on the old interface. However, in my application, this actually doesn't solve my problem because I want to allow new connections to come on the new interface even if they have the same source IP. I'm now looking at using the "ip route" command to set source-based routing rules.

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• DNS Does Not Register at Off-site Locations

  - by Russ Warren

  First of all, let me give you the specifics of our setup: Windows Small Business Server 2008 Domain w/ all applicable updates on the DC The DC does DHCP for the main site The DC does DNS for all sites 3 sites including our headquarters where the DC is located All sites are connected through OpenVPN SSL tunnels terminated by an Untangle box at each site The 2 remote sites us the Untangle box as a DHCP server for their subnet, which assigns the DC as the primary DNS server Collection of Windows XP and Windows 7 workstations connected to the domain Here's the issue: All of the workstations at the main site register with the DNS server on the domain controller fine. As they grab an IP from the DHCP server, it updates the DNS server with the new host record. I have 2 systems (each at different remote sites) that fail to register with the DNS server. I've attempted the following troubleshooting steps: Confirmed the network adapter is using the DC as a DNS server Confirmed 2-way traffic is possible between DC and workstation Verified the "Register with DNS server" setting was checked in the adapter properties Attempted ipconfig /registerdns and received no errors For the time being, I have setup a DHCP reservation for these systems and manually created a host record. This seems to work fine, but I need a solution for any new systems that go out there.

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• How small (spec wise) can a virtual machine be and still boot up and run some sort of OS?

  - by IllvilJa

  One of the advantages with virtual machines is that you can be very flexible with their sizes. If the host system permits it, you can have a very large virtual machine with a lot of virtual RAM and disk. Also, you can decide to go the other way around, to give the virtual machine a very modest amount of RAM and disk and then choose and configure the OS appropriately. The question is, how small virtual machines have people managed to setup (and get to both boot up and to run)? Virtual machines doing something usuful is preferable, even if I know "useful" in this context is awfully subjective, but laboratory-cases with a configuration stripped beyond common sense could be intresting as well, just to see what people manage to boot and run. Quite open ended question and quite academic, but think of it: an extremely small VM (which still does something useful) takes very little memory and disk and can be quite quickly saved to and restored from disk. If it's also gentle on CPU resources, one might consider having a huge number of such VMs up and running on a host. (Imagine a VM running just an old Commodore 64 or Commodore Amiga in it. Ok, way wrong CPU architecture for modern Virtualization software running on a x86-based PC but still an interesting thought. You could have quite a few such small VMs running on a modern PC.)

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• Postfix connect timing out remotely, working fine locally

  - by Moritz

  Running Postfix on Debian I cannot connect to send mail any more. It worked until approximately a week ago. I do not recall touching the configuration of the server during that time, which makes it difficult for me to find out what the problem is. When connecting from the server to itself it works fine: root@xxxx:~# telnet localhost 25 Trying 127.0.0.1... Connected to localhost.localdomain. Escape character is '^]'. ehlo localhost 220 mail.xxxx.de ESMTP Postfix (Debian/GNU) 250-mail.xxxx.de 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN quit 221 2.0.0 Bye Connection closed by foreign host. Trying to do the same remotely times out: laptop:~ $ telnet mail.xxxx.de 25 Trying 93.xx.xx.xx... telnet: connect to address 93.xx.xx.xx: Operation timed out telnet: Unable to connect to remote host Configuration is as follows: root@xxxx:~# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix home_mailbox = Maildir/ inet_interfaces = all inet_protocols = ipv4 mailbox_command = mailbox_size_limit = 0 mydestination = localhost.localdomain, localhost.localdomain, localhost myhostname = mail.xxxx.de mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtp_tls_note_starttls_offer = yes smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_exceptions_networks = $mynetworks smtpd_sasl_local_domain = smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom virtual_alias_maps = proxy:mysql:$config_directory/mysql_virtual_alias_maps.cf virtual_gid_maps = static:8 virtual_mailbox_base = /var/vmail virtual_mailbox_domains = proxy:mysql:$config_directory/mysql_virtual_domains_maps.cf virtual_mailbox_maps = proxy:mysql:$config_directory/mysql_virtual_mailbox_maps.cf virtual_minimum_uid = 150 virtual_transport = dovecot Receiving mails is no problem, as is retrieving them remotely. Do you have an idea what I could check next?

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• ServerName not working in Apache2 and Ubuntu

  - by CreativeNotice

  Setting up a dev LAMP server and I wish to allow dynamic subdomains, aka ted.servername.com, bob.servername.com. Here's my sites-active file <VirtualHost *:80> # Admin Email, Server Name, Aliases ServerAdmin [email protected] ServerName happyslice.net ServerAlias *.happyslice.net # Index file and Document Root DirectoryIndex index.html DocumentRoot /home/sysadmin/public_html/happyslice.net/public # Custom Log file locations LogLevel warn ErrorLog /home/sysadmin/public_html/happyslice.net/log/error.log CustomLog /home/sysadmin/public_html/happyslice.net/log/access.log combined And here's the output from sudo apache2ctl -S VirtualHost configuration: wildcard NameVirtualHosts and default servers: *:80 is a NameVirtualHost default server happyslice.net (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost happyslice.net (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost happyslice.net (/etc/apache2/sites-enabled/happyslice.net:5) Syntax OK The server hostname is srv.happyslice.net. As you can see from apache2ctl when I use happyslice.net I get the default virtual host, when I use a subdomain, I get the happyslice.net host. So the later is working how I want, but the main url does not. I've tried all kinds of variations here, but it appears that ServerName just isn't being tied to the correct location. Thoughts? I'm stumped. FYI, I'm running Apache2.1 and Ubuntu 10.04 LTS

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• How to enable the 2 concurrent (+1 console) sessions on Windows Server 2012

  - by Dai

  I have a Windows Server 2012 VM running on Windows Azure. I want to enable the ability for 2 simultaneous administrative sessions over Remote Desktop. This is permitted under the EULA for Windows Server 2012. This is NOT the same thing as the fully-blown Terminal Services / RDS feature. In Windows Server 2000 and 2003, multiple concurrent sessions (up to a limit of 2, plus the root /console session) were enabled by default (such that logging-in via RDP without logging-out first would create a new session rather than reconnecting to the old session). In Server 2008 and later it uses single-sessions by default, as this simplifies administration (as most people want to connect to old sessions). In Windows Server 2008 R2, you can add the MMC snap-ins for Remote Desktop Host Configuration which allows you to re-enable concurrent sessions. However, in Server 2012, after adding the Remote Administration snap-ins from Server Manager it seems the Remote Desktop Host Configuration snap-in has been removed. How can I re-enable the multiple concurrent sessions for Remote Desktop for Administration in Windows Server 2012?

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• SSRS 2005 inaccessible after install

  - by Gabriel Guimarães

  Hi I've just installed SQL 2005 and Database Engine is ok, however I can't access it for nothing. When I go to http://localhost/reports I get this prompt for a username and password and it fails with 401.1. When I tried to disable kerberos on the virtual directories, nothing changed. I've tried changing the auth to anonymous and get: Internet Explorer cannot display the webpage. When I access from another machine, I get the prompt only once and get this error. Internet Explorer cannot display the webpage. Can't access this with IE or SSMS 2005. If I try to access with Management Studio i get this error: TITLE: Microsoft SQL Server Management Studio The underlying connection was closed: An unexpected error occurred on a receive. (Microsoft.SqlServer.Management.UI.RSClient) ADDITIONAL INFORMATION: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. (System) An existing connection was forcibly closed by the remote host (System) BUTTONS: OK By the way the server info: its a Win 2003 R2 Standard with IIS 6 Can't seem to understand this. Does anyone have a hint?

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• Window 7 image in vmware will allow network connection out but not http

  - by Ormis

  I am currently trying to create a set of images to deploy on my network, but I've run in to a snag. When I create my own Windows 7 image I can successfully use NAT for connecting to the network but whenever I try to access a webpage I get nothing. To be more specific, All firewalls/iptables are disabled on my host machine, my virtual machine, and my network. I can do lookups and all addresses respond correctly (i'm even using Google's DNS). On the host OS i have full connectivity. On the virtual machine I can ping any device I want and all addresses resolve correctly. Within a browser I cannot reach any page via hostname or IP. I feel almost like port 80 is being blocked but i can't find any reason this would be the case. If anyone has had this occur before, I would love some insight to the problem. I understand this question is a bit out of the norm for stackoverflow, but I've run out of ideas. Thank you for any help you can provide.

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• Network config for KVM on physical machine with single NIC and single public IP

  - by neo0

  I have a physical machine running CentOS 6.4 and I will rent a place to run it in a data center. I want to install KVM on that machine to run some virtual machines. The problem is my physical machine have only one NIC and the data center give me a public IP for that interface. So how should I configure network on the physical machine to make it assign for each vm a private IP that can connect to Internet. If I create a br0 bridged with eth0 interface and create a vm with option --bridge=br0 then KVM could not assign an IP for the vm so setup can not be done. Should I use NAT mode? Does KVM have any host-only network like Virtualbox? But the vm still has to connect to outside? Thank you! Update I install the guest network using NAT (--network network:default) and then I only have to port-forwarding from the host. But if I config br0 bridged with physical eth0 then the guest can not get an IP from boot. So I removed the br0 and it worked.

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• Cisco Catalyst 3750 connected to Cisco ASA 5505 and dropping packets

  - by Bo102010

  (Cross posted from Super User per suggestion there) At the office, I have inherited a network that I am still trying to fully comprehend. I have a problem today with a new connection between: A port on a Cisco Catalyst 3750 [WS-C3750G-48TS-S running C3750-IPSERVICESK9-M version 12.2(53)SE1] A port on a Cisco ASA 5505 [ASA Software version 8.3(2)] The 3750 is home to a Vlan that has a few ports assigned to it. interface Vlan3 description Internal network (172.18.160.0/24) ip address 172.18.160.1 255.255.255.0 I have a host (outside of my control) that needs to be in this VLAN (i.e it must have an address 172.18.160.something/24) that also needs to access the Internet. To accomplish this, I ran a link from the Catalyst (Gi1/0/13) to the ASA (Ethernet 0/5). I configured the Catalyst port like so: interface GigabitEthernet1/0/13 description To ASA, 172.18.160.69 switchport access vlan 3 switchport mode access speed 100 duplex full I configured the ASA like so: interface Vlan1 nameif inside security-level 100 ip address 172.18.160.69 255.255.255.0 interface Ethernet0/5 speed 100 duplex full Then I plugged the host into Ethernet 0/4 on the ASA and instructed its owner to make its default gateway 172.18.160.69. I made a NAT rule in the ASA and set up some rules, and it's able to access the Internet without issue. However, I noticed that the Catalyst reports a ton of packets being dropped toward the ASA. Catalyst3750#show interfaces GigabitEthernet 1/0/13 | include counters|drops Last clearing of "show interface" counters 00:28:13 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 136909347 This is a huge number of drops, since there's not much traffic on this VLAN at all. I tried these things: Make sure speed and duplex agree on both sides (100 Mbps / Full) Set no cdp enable on the Catalyst Gi10/13 Set no keepalive on the Catalyst Gi10/13 Checked for excessive CPU usage on both Checked for excessive traffic on both Am I missing something? Any help would be appreciated.

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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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• svn using nginx Commit failed: path not found

  - by Alaa Alomari

  I have built svn server on my nginx webserver. my nginx configuration is server { listen 80; server_name svn.mysite.com; location / { access_log off; proxy_pass http://svn.mysite.com:81; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; include fastcgi_params; } } Now, i can svn co and svn up normally without having any problem and when i try to commit i get error: $svn up At revision 1285. $ svn info Path: . URL: http://svn.mysite.com/elpis-repo/crons Repository Root: http://svn.mysite.com/elpis-repo Repository UUID: 5303c0ba-bda0-4e3c-91d8-7dab350363a1 Revision: 1285 Node Kind: directory Schedule: normal Last Changed Author: alaa Last Changed Rev: 1280 Last Changed Date: 2012-04-29 10:18:34 +0300 (Sun, 29 Apr 2012) $svn st M config.php $svn ci -m "Just a test, add blank line to config" config.php Sending config.php svn: Commit failed (details follow): svn: File 'config.php' is out of date svn: '/elpis-repo/!svn/bc/1285/crons/config.php' path not found if i try to svn co on port 81 (my proxy_pass which is apache) and then svn ci, it will work smoothly! but why it doesn't work when i use nginx to accomplish it? any idea is highly appreciated.

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• Exchange 2010 POP3/IMAP4/Transport services complaining that they can't find SSL certificate after blue screen

  - by Graeme Donaldson

  We have a single-server Exchange 2010 setup. In the early hours of this morning the server had a blue screen and rebooted. After coming back up the POP3/IMAP4 and Transport services are complaining that they cannot find the correct SSL certificate for mail.example.com. POP3: Log Name: Application Source: MSExchangePOP3 Date: 2012/04/23 11:45:15 AM Event ID: 2007 Task Category: (1) Level: Error Keywords: Classic User: N/A Computer: exch01.domain.local Description: A certificate for the host name "mail.example.com" couldn't be found. SSL or TLS encryption can't be made to the POP3 service. IMAP4: Log Name: Application Source: MSExchangeIMAP4 Date: 2012/04/23 08:30:44 AM Event ID: 2007 Task Category: (1) Level: Error Keywords: Classic User: N/A Computer: exch01.domain.local Description: A certificate for the host name "mail.example.com" couldn't be found. Neither SSL or TLS encryption can be made to the IMAP service. Transport: Log Name: Application Source: MSExchangeTransport Date: 2012/04/23 08:32:27 AM Event ID: 12014 Task Category: TransportService Level: Error Keywords: Classic User: N/A Computer: exch01.domain.local Description: Microsoft Exchange could not find a certificate that contains the domain name mail.example.com in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Default EXCH01 with a FQDN parameter of mail.example.com. If the connector's FQDN is not specified, the computer's FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for that FQDN. If this certificate exists, run Enable-ExchangeCertificate -Services SMTP to make sure that the Microsoft Exchange Transport service has access to the certificate key. The odd part is that Get-ExchangeCertificate show the cert as enabled for all the relevant services, and OWA is working flawlessly using this certificate. [PS] C:\Users\graeme\Desktop>Get-ExchangeCertificate Thumbprint Services Subject ---------- -------- ------- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ....S. CN=exch01 YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY ....S. CN=exch01 ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ IP.WS. CN=mail.example.com, OU=Domain Control Validated, O=mail.exa... Here's the certificate in the computer account's personal cert store: Does anyone have any pointers for getting POP3/IMAP4/SMTP to use the cert again?

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• How to troubleshoot connectivity when curl gets an *empty response*

  - by chad

  I want to know how to proceed in troubleshooting why a curl request to a webserver doesn't work. I'm not looking for help that would be dependent upon my environment, I just want to know how to collect information about exactly what part of the communication is failing, port numbers, etc. chad-integration:~ # curl -v 111.222.159.30 * About to connect() to 111.222.159.30 port 80 (#0) * Trying 111.222.159.30... connected * Connected to 111.222.159.30 (111.222.159.30) port 80 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.19.0 (x86_64-suse-linux-gnu) libcurl/7.19.0 OpenSSL/0.9.8h zlib/1.2.3 libidn/1.10 > Host: 111.222.159.30 > Accept: */* > * Empty reply from server * Connection #0 to host 111.222.159.30 left intact curl: (52) Empty reply from server * Closing connection #0 So, I understand that an empty response means that curl didn't get any response from the server. No problem, that's precisely what I'm trying to figure out. But what more specific info can I derive from cURL here? It was able to successfully "connect", so doesn't that involve some bidirectional communication? If so, then why does the response not come also? Note, I've verified my service is up and returning responses. Note, I'm a bit green at this level of networking, so feel free to provide some general orientation material.

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• Debian Squeeze Linux 9p virtfs guest mount failure

  - by Tero Kilkanen

  First some background information on the server: Host OS: Debian Linux Squeeze + qemu-kvm version 1.0+dfsg-8~bpo60+1 Guest OS: Debian Linux Squeeze I use qemu-kvm via libvirt. I have set up 9p VirtFS with the following in Guest's XML config: <filesystem type='mount' accessmode='passthrough'> <source dir='/srv/www'/> <target dir='wwwdata'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </filesystem> That is, I want to share /srv/www to the guest OS using mount tag wwwdata. When I try to mount the VirtFS share from the guest, I get an error message: root@server:~# mount -t 9p -o trans=virtio,version=9p2000.L2 wwwdata /srv/www/ mount: wwwdata: can't read superblock I also tried virtfs target dir/mount_tag www at first. I got the same error message. However, I was able to mount the VirtFS share using mount tag www1111, or www1 or similar. Some more notes on this one. dmesg doesn't show anything useful either in guest or the host. The only sign is this entry in the guest dmesg: [ 36.054936] Installing v9fs 9p2000 file system support Does anyone know how to get this working correctly? Google gives no useful information on this issue; I've tried several searches.

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• Problems starting autossh on boot [ubuntu]

  - by Ken

  I'm trying to automatically start an SSH tunnel to my server on boot from a ubuntu box. I have an ubuntu box that's mounted on an 18-wheeler and is networked behind an air card. The box hosts a mysql database that i'm trying to have replicated when the aircard is connected. As I can never be sure of my IP and how many or which routers I'm behind I'm connected to my replication server with an SSH tunnel. I got that working using the following command: ssh -R 3307:localhost:3307 [email protected] Now I'd like that to start whenever the box is, and be alive all the time, so I installed auto-ssh and setup this little script: ID=xkenneth HOST=erdosmiller.com AUTOSSH_POLL=15 AUTOSSH_PORT=20000 AUTOSSH_GATETIME=30 AUTOSSH_DEBUG=yes AUTOSSH_PATH=/usr/bin/ssh export AUTOSSH_POLL AUTOSSH_DEBUG AUTOSSH_PATH AUTOSSH_GATETIME AUTOSSH_PORT autossh -2 -fN -M 20000 -R 3307:localhost:3306 ${ID}@${HOST} I've tried putting this scrip in /etc/init.d/ and using a post-up command in /etc/network/interfaces as well as putting it in /etc/network/if-up.d/. In both situations the script starts on boot, but the tunnel doesn't appear to be correctly established. The script works when run manually.

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• KVM network bridge with two NICs

  - by Eil

  Greetings, I'm trying to set up bridged networking with KVM and am getting nowhere. There are docs and tutorials on the subject, but they all seem to conflict or don't provide enough info. I was wondering if someone can give me a high-level overview of how to get this working. I can probably work out the details myself (configuring the interfaces, adding routes, etc), I just need help on the big picture: how everything is interconnected. I have a RHEL5 server with KVM installed and running. It has two physical NICs, eth0 and eth1 in the same VLAN. I would like to use eth1 for all traffic between the guests and the rest of the network and reserve eth0 for host management, guest migrations, etc if possible. I'm not picky about which one gets the default route, although it would be nice if we could make it eth0. All of the guests will have static IPs. I would prefer that when a new guest is added, the networking configuration only needs to be set from within the guest itself. Basically, I want this: eth0: all host traffic eth1: all guest traffic Open to any other suggestions if this isn't possible or will be kludgy/difficult. Pointers to existing documentation might not be helpful since I've already been though just about everything out there. Thanks for any help.

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• Why can't I route to some sites from my MacBook Pro that I can see from my iPad?

  - by Robert Atkins

  I am on M1 Cable (residential) broadband in Singapore. I have an intermittent problem routing to some sites from my MacBook Pro—often Google-related sites (arduino.googlecode.com and ajax.googleapis.com right now, but sometimes even gmail.com.) This prevents StackExchange chat from working, for instance. Funny thing is, my iPad can route to those sites and they're on the same wireless network! I can ping the sites, but not traceroute to them which I find odd. That I can get through via the iPad implies the problem is with the MBP. In any case, calling M1 support is... not helpful. I get the same behaviour when I bypass the Airport Express entirely and plug the MBP directly into the cable modem. Can anybody explain a) how this is even possible and b) how to fix it? mella:~ ratkins$ ping ajax.googleapis.com PING googleapis.l.google.com (209.85.132.95): 56 data bytes 64 bytes from 209.85.132.95: icmp_seq=0 ttl=50 time=11.488 ms 64 bytes from 209.85.132.95: icmp_seq=1 ttl=53 time=13.012 ms 64 bytes from 209.85.132.95: icmp_seq=2 ttl=53 time=13.048 ms ^C --- googleapis.l.google.com ping statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 11.488/12.516/13.048/0.727 ms mella:~ ratkins$ traceroute ajax.googleapis.com traceroute to googleapis.l.google.com (209.85.132.95), 64 hops max, 52 byte packets traceroute: sendto: No route to host 1 traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 *traceroute: sendto: No route to host traceroute: wrote googleapis.l.google.com 52 chars, ret=-1 ^C mella:~ ratkins$ The traceroute from the iPad goes (and I'm copying this by hand): 10.0.1.1 119.56.34.1 172.20.8.222 172.31.253.11 202.65.245.1 202.65.245.142 209.85.243.156 72.14.233.145 209.85.132.82 From the MBP, I can't traceroute to any of the IPs from 172.20.8.222 onwards. [For extra flavour, not being able to access the above appears to stop me logging in to Server Fault via OpenID and formatting the above traceroutes correctly. Anyone with sufficient rep here to do so, I'd be much obliged.]

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• Configure nginx for multiple node.js apps with own domains

  - by udo

  I have a node webapp up and running with my nginx on debian squeeze. Now I want to add another one with an own domain but when I do so, only the first app is served and even if I go to the second domain I simply get redirected to the first webapp. Hope you see what I did wrong here: example1.conf: upstream example1.com { server 127.0.0.1:3000; } server { listen 80; server_name www.example1.com; rewrite ^/(.*) http://example1.com/$1 permanent; } # the nginx server instance server { listen 80; server_name example1.com; access_log /var/log/nginx/example1.com/access.log; # pass the request to the node.js server with the correct headers and much more can be added, see nginx config options location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_pass http://example1.com; proxy_redirect off; } } example2.conf: upstream example2.com { server 127.0.0.1:1111; } server { listen 80; server_name www.example2.com; rewrite ^/(.*) http://example2.com/$1 permanent; } # the nginx server instance server { listen 80; server_name example2.com; access_log /var/log/nginx/example2.com/access.log; # pass the request to the node.js server with the correct headers and much more can be added, see nginx config options location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_pass http://example2.com; proxy_redirect off; } } curl simply does this: zazzl:Desktop udo$ curl -I http://example2.com/ HTTP/1.1 301 Moved Permanently Server: nginx/1.2.2 Date: Sat, 04 Aug 2012 13:46:30 GMT Content-Type: text/html Content-Length: 184 Connection: keep-alive Location: http://example1.com/ Thanks :)

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