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• Bridging with aliased Ethernet card for Virtualizing with single Ethernet card

  - by user113505

  We are having a server with good CPU and RAM,so we are planning to do XEN virtualization on ubuntu 12.04 server to handle high traffic. The plan is to keep the host machine only to manage VMs(no NAT ing). A New public IP will be assigned to that VM,For that i think we need a Bridge to external network(Since my Machine has only single ethernet card aliased with 4 different Pub IP's) Is it possible to create a bridge using aliased IP single ethernet card aliased to 4 pub IPs Do we need an additional Ethernet card to do Bridging.Only have ssh access to the machine. Any suggestions will be appreciated.

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• Cisco ASA Hairpinning with Dynamic IP

  - by Joseph Sturtevant

  I currently have my Cisco ASA 5505 firewall configured to forward port 80 from the outside interface to a host on my dmz interface. I also need to allow clients on my inside interface to access the host in the dmz by entering the public ip / dns record in their browsers. I was able to do that by following the instructions here, resulting in the following configuration: static (dmz,outside) tcp interface www 192.168.1.5 www netmask 255.255.255.255 static (dmz,inside) tcp 74.125.45.100 www 192.168.1.5 www netmask 255.255.255.255 (Where 74.125.45.100 is my public IP and 192.168.1.5 is the IP of the dmz host) This works great except for the fact that my network has a dynamic public IP and this configuration will therefore break as soon as my public IP changes. Is there a way to do what I want with a dynamic ip? Note: Adding an internal DNS record won't solve my problem since I have multiple dmz hosts mapped to different ports on the public IP.

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• Chroot with CentOS 5.3 + openssh 4.3p2

  - by Scud

  OS: CentOS 5.3, with openssh 4.3p2 Trying to set 'chroot' in ssh shell, but openssh version prior to 4.8 doesn't take below settings. yum update openssh open up to version 4.3 which is quite old. Doesn't CentOS support openssh 4.8 or up? If that's the case, how to set chroot with openssh 4.3? or is it better to just using FTP? My purpose is limit SFTP or FTP access to certain folder, not root folder. Thanks! Match group sftponly ChrootDirectory /home/%u X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp

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• Need help diagnosing network performance issues

  - by tokes

  I am currently working in a developing country as a system analyst for a government department. My area of expertise is software projects, but I've come across a few issues with the network setup in my office. (Unfortunately, being a developing country, there's not a lot of professional help available for this sort of thing.) Most recently, I am trying to diagnose a problem with slowness on the network. Our office is connected to the internet via an ADSL wireless modem/router (called Router). The modem is connected via ethernet to a switch (called Switch). The modem also acts as a wireless access point (called Wireless1), though because it is in a room at the end of the floor, it's range is limited. There are ethernet ports installed around the office. The cables of these all lead back to the same switch. In closer vicinity to the bulk of the client computers, there is another wireless router that acts as an access point for those clients (called Wireless2). That router is connected via ethernet to a wall port, and therefore to Switch. There is also a Windows server which acts as a DNS server (called DNSBox) which is located in the same room and is connected directly to Switch. ---Internet----------| Router/Wireless1 192.168.10.1 ---------------| |----|=========| DNSBox | |-------------------- 192.168.10.4 --------------------| Switch |---Other clients---- | |-------------------- |----|=========| Wireless2 ------------------| 192.168.10.198 One final thing to mention about the network setup. All clients are configured with manual IP addresses. Their router/gateway is set to the IP address of Router, and their DNS server is set to the IP address of DNSBox (with a secondary IP set to an external IP - that of our ISP's DNS server). Here are the symptoms we are experiencing: Clients connected to Wireless2 AP experience slow and unstable connections to the internet. (Slow here is defined as speeds of ~1KB/s, though ping response times seem to be as normal.) Clients connected via ethernet to Switch also experience the same slowness. Clients connected to Wireless1 AP (i.e. connecting via wireless directly to the ADSL modem) experience normal connections to the internet. Clients connected via ethernet to Router (i.e. connecting via ethernet directly to the ADSL modem) also experience normal connections to the internet. I also tried to gauge the connection performance between two machines on the network via ethernet: A file transfer between two clients who were both directly connected to Switch was the fastest; A file transfer between one client directly connected to Switch, and one client directly connected to Router (which is directly connected to Switch) performed much slower; A file transfer between two clients directly connected to Router also performed slowly. Things I have attempted to diagnose the problem: Restarted Switch -- no change. We tried unplugging ethernet jacks from Switch 4 at a time and testing the internet connection. The thought here was that perhaps a client on the network has contracted a virus, and is possibly spamming the network with traffic? (Not very technical, I know.) Unfortunately we couldn't get any significant increases in performance using this method. There were a couple of times when it seemed to be better, but then the connection speed quickly dropped back to slow/dead pace. I didn't want to unplug all jacks from Switch because I was concerned that users might be affected or that I would re-plug in the jacks incorrectly (should I even be worried about that? a port is a port on a switch, right?) I tried swapping the ethernet cable used to connect Router to Switch -- no change in performance. I tried swapping the port used on Switch for Router -- no change in performance. Anyone got any ideas on what this could be? Should I be mentioning specific brand names/models of the hardware used? Virii outbreaks are common in this country/office -- what could I be doing to figure out if a virus is at fault? If it is a virus, it doesn't seem to be generating a lot of traffic to/from the internet, because a) I can still get a good speed if I am directly connected to Router / Wireless1 and b) our ISP data usage has not risen suspiciously. Thanks for your help! Update #1 Here are the specs of some of the hardware: Switch is an Edimax ES3132RL 32-Port 10/100 Rackmount Switch Router is a D-Link DSL-G604T Update #2 I just tried unplugging everything except a laptop and Router from Switch. Speeds are still slow. I guess that means that Router / Switch are not being flooded? It seems more and more likely that the cause is something to do with the interaction between Router and Switch. However, I still can't find any useful resources on setting the LAN speed for either (and I'm not well-versed in these advanced networking configurations).

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• Windows XP SP3 - Upgrade - No longer part of workgroup

  - by dbasnett

  When I woke up this morning I decided to have a really lousy day. For a long time I have been telling auto updater to remind me later about installing SP3. But not this morning... It looked good, until I tried to access my NAS. Can't connect, can't see it, nothing. The other computers can see it, so it is my PC. Oh, and they can no longer see me. It turns out the only thing I can see is the printer. So if you know what wonderful thing Microsoft decided to change during the upgrade (oxymoron in my opinion), I would be grateful. Short of turning on all of the services I have tried so many things, and rebooted so often, that I am just sick of it.

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• Double default gateway ubuntu server

  - by Elena

  Hi, I've just installed an Ubuntu server 9.10 on an EEEBox. This is my /etc/network/interfaces # The loopback network interface auto lo iface lo inet loopback auto wlan0 iface wlan0 inet static address 192.168.48.16 netmask 255.255.248.0 wireless-essid mynet auto eth0 iface eth0 inet static address xx.xx.xx.xx netmask 255.255.255.224 gateway xx.xx.yy.yy When I restart /etc/init.d/networking, I can access the eth0 ip address from the internet and I can ping the machines in my wifi network mynet. Everything works fine and I have one default gateway. But after some time if I check again the route I just find two default gateways: one is correct and is the previous one, but the other is the one of the wifi network. I have a quite low signal of mynet where my server is and sometimes the wifi just disconnect and then reconnect again. Then I think that this can be a problem and the dhcp of the wifi net, when reconnecting it also add a default gateway. Any idea on how to resolve this issue?

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• Linux: setting up an elite/high-anonimity Web proxy on a dedicated server

  - by YellowSquirrel

  I'm renting a dedicated server which I'd like to use to "surf the Web": basically I want to always surf the Web from the same static IP (the one of my dedicated server). I can do it by running Xvnc/FreeNX on the dedicated server, but this is kinda slow and clumsy (I tried it). What are the steps needed to install an "elite/high-anonimity" Web proxy on a dedicated (Debian) Linux server knowing that my two requirements are: I'm the only person that needs access to the proxy all I want is that my broadband (dynamic) IP is completely hidden (I want to always surf from my dedicated server's IP). Note that using the static IP people can find my domains and my real name and I'm perfectly fine with that (actually it is what I want). What I don't want is people knowing from which dynamic IP (broadband) I'm connecting. What are the steps needed to do that? (basically I don't care about "anonimity", what I want is to appear to surf from a static IP and I think I need what is called an "elite" Web proxy to do that, but I'm not sure) Technical infos and sample configuration most welcome :)

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• Urgent :The desktop currently has no desktop sources

  - by vDeepak

  Although i know there are large no. of post already floating over same issue , but am having no luck so far. I am getting below error message when trying to connect desktop by vmware view client 4: "the desktop currently has no desktop sources............. " My configuration is listed below: using view manager server over VM box. successully deployed 10 desktop VM over View manager and they are persistent mode. previoulsy few users were able to coonect to these desktops successfully under desktop sources i am getting "Domain name\user ID" and under status its showing "Ready" So when any other user who is authenticated trying to access desktop getting above mentioned error message. The other users are unique one who previously never logged in. Also i tried to rebooth the VM desktops assuming they might be locked by another user , but still am getting the same error message. Please help.

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• Remote desktop is slow when connecting to a computer which is part of a domain

  - by Peuge

  Hey all, We have two windows 2003 machines, one is a DC and another is joined to the domain of the DC. These machines are not locally available to us so we have to remote desktop into them. When we first got the machines remote desktop was blazing as the machines are only a couple of miles away. I then installed AD and setup routing and remote access, I also setup DNS on the DC. Now when I try remote Desktop into the machine which is part of the domain (not the DC) it is painfully slow! Remote Desktop onto the DC is also noticeably slower! Another problem is that our FTP to the DC has also become slow. I don't know what other information I can provide, as I am new to Sys Admin (moving over from development). The speed should be fast as these machines are only a couple of miles away. Any help / suggestions is greatly appreciated! Thanks Peuge

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• SQL Server crashes when remote query fails

  - by Hemanshu Bhojak

  Setup: I have a linked server setup on SQL Server 2005 which is pointing to an Oracle DB. The linked server has RPC enabled. Problem: When a query throws an exception on the remote server (Oracle DB) the SQL Server instance crashes. The logs say that the crash was due to some problem with the RPC call. Is there a way in which I can prevent the entire server to collapse but also use RPC over my linked server. EDIT: Event Log SQL Server is terminating because of fatal exception c0000005. This error may be caused by an unhandled Win32 or C++ exception, or by an access violation encountered during exception handling. Check the SQL error log for any related stack dumps or messages. This exception forces SQL Server to shutdown. To recover from this error, restart the server (unless SQLAgent is configured to auto restart). For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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• Getting 0x80070043 error when accessing Samba share from Windows 7

  - by FelixM

  I created a Samba share on my new Ubuntu 10.04 machine. When I try to access it from a Windows 7 client, I get network error 0x80070043 (The network path not found). However, I get this error when I click on the share in the Windows Explorer, so it seems that Windows does find the path. I already enabled NTLMv1, disabled 128bit security and made sure that NetBIOS is running. I briefly disabled the Windows firewall, it didn't make a difference. What could be the problem?

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• uwsgi_params not in nginx

  - by Halit Alptekin

  Firstly I setup nginx and uwsgi via apt-get. And,I add the line to nginx conf file(/etc/nginx/conf.d/default.conf) like below line; server { listen 80; server_name <replace with your hostname>; #Replace paths for real deployments... access_log /tmp/access.log; error_log /tmp/error.log; location / { include uwsgi_params; uwsgi_pass 127.0.0.1:8889; } } I had a error; Starting nginx: [emerg]: open() "/etc/nginx/uwsgi_params" failed (2: No such file or directory) in /etc/nginx/conf.d/default.conf:11 configuration file /etc/nginx/nginx.conf test failed If I add uwsgi_params file from uwsgi's source;I had a simple error. Thanks

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• DD-WRT Router acting as a Switch and Wi-Fi AP

  - by dotnetchris

  Recently I upgraded to Comcast Business and their modem has a built-in router so I took off my DD-WRT router and moved to a location in my home where I needed more ports and Wi-Fi (preferably without running new Ethernet cables since it's 50-100 foot run through floor and ceilings). I have my network cable from my Comcast modem going into Port 1 of my DD-WRT router with Port 2 and 3 being networked PCs. I have DD-WRT setup as a DHCP forwarder with the firewall disabled. This lets my all of my devices access the network fine. Is the correct the way to do this? Or is this a less optimal solution and it should be done in a slightly different way?

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• Scheduled Task to show console window when logged on but still run when not logged on

  - by HeartWare

  Is it possible (and if so, how) to set up a task (console application) in Server 2008 so that it'll run both when a user is logged in and when no user is logged in, AND - if the user is logged in (either local or via RDP) - have the console appear on the screen while the program is running? Ie. the program should run under the defined user context and it writes status messages to stdout, which goes to a standard console window. This console window is either shown (if the defined user is currently logged in locally or via RDP), or not shown (but the application is still run). I have access to the source of the console application, so if it needs some additional code (like specifically opening up a new console window or what have you), then that's not a problem. At the moment, I can set up the task as "Run only when user is logged on" which will run the application when the user is logged on (local or RDP) and I can then see the status messages, or I can set it up as "Run whether user is logged or not" and no status output is visible - not even if the user is logged on.

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• SQL Server crashes when remote query fails

  - by Hemanshu Bhojak

  Setup: I have a linked server setup on SQL Server 2005 which is pointing to an Oracle DB. The linked server has RPC enabled. Problem: When a query throws an exception on the remote server (Oracle DB) the SQL Server instance crashes. The logs say that the crash was due to some problem with the RPC call. Is there a way in which I can prevent the entire server to collapse but also use RPC over my linked server. EDIT: Event Log SQL Server is terminating because of fatal exception c0000005. This error may be caused by an unhandled Win32 or C++ exception, or by an access violation encountered during exception handling. Check the SQL error log for any related stack dumps or messages. This exception forces SQL Server to shutdown. To recover from this error, restart the server (unless SQLAgent is configured to auto restart). For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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• email bouncing back

  - by moiz.in

  Some emails are bouncing back with the error message below The following organization rejected your message: cluster-m.mailcontrol.com Also when I looked the further details it gives me this information: Diagnostic information for administrators: Generating server: myserver.com.au [email protected] cluster-m.mailcontrol.com #554 5.7.1 Access denied ## Received: from myserver.com.au ([192.168.0.3]) by myserver.com.au ([192.168.0.3]) with mapi; Mon, 27 Jun 2011 08:04:50 +0800 From: XYZ <[email protected]> To: "XYZ ([email protected])" <[email protected]> Date: Mon, 27 Jun 2011 08:04:49 +0800 Subject: FW: Pic S979888 Thread-Topic: Pic S979888 Thread-Index: Acw0WppDIX2PPJwZR0OGVP1rbUtzDAAAzcuA Message-ID: <[email protected]> Accept-Language: en-US, en-AU Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: en-US, en-AU Content-Type: multipart/mixed; boundary="_004_573874A6BF36864EA3FB179BF7A43C2B031D388DF7D8bunsrvapp00_" MIME-Version: 1.0 Could you please tell me what is wrong with this and why is it bouncing back?

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• GnuPG PHP gnupg Folder & Files Permission

  - by Michael Robinson

  Situation: we plan on using PHP's GnuPG extension to encrypt/decrypt files. Currently we've setup some test cases, using keys generated with GPG. The generated files reside in: /Users/username/.gnupg/ I am able to get keyinfo for the key I want to use to encrypt/decrypt, but when I attempt to use addencryptkey, I get: (E_WARNING: 2): gnupg::addencryptkey() [gnupg.addencryptkey]: get_key failed I think this is due to the permissions on the ~/.gnupg folder & enclosed files. The files are owned by me - username, but apache runs as www. A few days ago I did have this working, but it seems each time I use GPG Keychain Access to import / export a key, the folder's permissions are changed. Question: What are the exact permissions required to allow PHP's GnuPG to add encrypt & decrypt keys?

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• ISA Proxy - HTTPS Traffic

  - by x100

  We have an ISA 2006 setup for our organisations proxy. It's been working well for the last few months just blocking everything except a few allowed web site and web applications. We need to allow some people to access a web application hosted off site via HTTPS. I've tried and tried, wasted 3 days on it and have given in. Can someone please tell me how on earth this is achieved? Looking at the Monitor, it looks like it passes one rule, then is blocked by the default rule. I just don't unterstand it well enough to take it on further.

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• Very High Interrupt CPU usage in Win2k3 VM on vSphere

  - by Darragh

  Hi, I've been testing some software in a server virtual environment and I've noticed I get a huge amount of CPU usage on the Interrupts process. My question is, how does this relate to the virtual hardware platform as the rate is allot lower in a real system. Some how the hypervizor scheduler works hard to over come this problem but not as well as on real hardware does. Obvious things are high I/O and disk access but this application mostly just sits and works in memory allot. If anyone has experienced the same, please let me know. thanks in advance Screenshot: Process Explorer

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• Apple File Sharing fails to connect

  - by Josh

  Running OSX Lion Server (10.7.4), and about once a week or so the Apple File Sharing service stops letting clients connect to its shares. On the client we will see a dialog box stating "There was a problem connecting to the server ". Browsing the server we simply no longer see the shares. The clients are also running the latest OSX (10.7.4) In /var/log/system.log we see entries like the following: Jun 26 08:38:22 w3 AppleFileServer[20511]: received message with invalid client_id 157 Jun 26 08:42:11 w3 AppleFileServer[20511]: received message with invalid client_id 165 Jun 26 08:42:21 w3 AppleFileServer[20511]: received message with invalid client_id 174 Where 20511 appears to be the pid, and client_id appears to be incremented with each failed attempt. Nothing jumps out at me from /Library/Logs/AppleFileService/AppleFileService[Access|Error].log Restarting the service fixes the problem: serveradmin stop afp && serveradmin start afp So I added a script to do this daily using the periodic service. But, we still encounter this problem about once a a week.

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• Windows 7 file sharing password protecting or making stuff available to just me

  - by Carbonara

  Even with the new Homegroup feature I'm still finding the way Windows deals with folder sharing utterly baffling. Here's what I want to do. I have two computers, a PC Desktop and a laptop. I also live in a shared flat with other computer users. I have set up a Homegroup and a Workgroup on the desktop and joined them on the laptop and in the home group I have shared video, music and pictures. This is so that anyone on the network can view pictures and listen to music etc. But I want my Documents folder from my desktop to only be available to me on my laptop and not to anyone else that may be on the network. The Homegroup only allows (from what I can gather from the baffling array of options) sharing with everyone or no one. Is it possible to only allow the laptop to access the documents folder on the desktop? The user name and password are the same on both computers.

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• Apache Redirect to Jboss SSL

  - by Rick

  I'm trying to have an SSL Connection to an Apache server on port 443 which I want to use to proxy connections to a JBoss server on a different port. The SSL certificates sit on the Jboss server not on the Apache server. Is it possible to redirect HTTPS traffic from Apache to the Jboss Server and have the JBoss server do the SSL handshake? The Apache server must be able to redirect HTTPS traffic for two different URLS. One for a secure site. The other for access to web services. By the way I'm using it mutual authentication, if that makes any difference. What does the Apache config file need to contain? or are there any good example of this out there? Thanks

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• Lighttpd proxy module - use with hostname

  - by k_wave

  I have to proxy a site which is hosted on an external webspace through my lighty on example.org. My config so far: $HTTP["url"] =~ "^/webmail" { proxy.server = ("/webmail/" => ( # this entry should link to example2.org ("host" => "1.2.3.4", "port" => 80) )) } The webspace provider has configured my domain as vhost. So if i access http://1.2.3.4/webmail/ lighttpd will only deliver the main site of the webspace provider which says "Site example.org was not found on our server." Any suggestions how i have to configure lighty to proxy sites that are only hosted as vhost (and do not have an ip on their own)?

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• Setting write permissions for folders while creating a package with MSDeploy

  - by bala_88

  I'm using MSDeploy to create an artefact as a build step in NAnt. This particular build step is called on successful compilation. The artefact is then used to for deployment. Here is the step specified in my build file. <target name="BuildMsDeployPackage" depends="StageForMsDeployPackaging"> <exec program="${msdeploy.exe}" workingdir="${buildDirectory}" verbose="true" commandline="-verb:sync -source:iisapp=${packagingDirectory} -dest:package=${publishDirectory}\${webapp.artifact.zip}"/> The source here is my my web project. I want to be able to set specify write access to a couple of folders in the package that is created. Is this possible? I know that there is a setAcl provider for this specific purpose, but can this be used while creating a package?

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• Accessing apache on virtual pc

  - by Rick Hensly

  I am using a virtual pc to test my website. I can access all my webpages on the virtual pc. However, images don't load correctly. I can browse to my images folder and view all of them. However, if I click an image it will not load, and the apache log shows the virtual pc's ip trying to view the image: 192.168.0.55 - - [25/Jun/2009:20:10:41 -0400] "GET /images/pic.png HTTP/1.1" 302 220 Now, if I refresh the page it loads. 192.168.0.55 - - [25/Jun/2009:20:10:51 -0400] "GET /images/bg.png HTTP/1.1" 200 214 Also, images won't load in html or css. It seems like a redirecting problem or something, but I have no clue how to fix it. Thanks for any advice

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