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• Weird unexpected image compression on a web server running Apache on Ubuntu?

  - by Billy Bob Thornton

  I have a weird problem on my production web server running Apache on Ubuntu: it compresses my images thereby dramatically lowering their quality! Actually I have two virtual hosts running, each located in a different folder. Wether I display .gif images by navigating on the two sites, or acceding them directly by their url, their size and quality are invariably degraded. I tried with three different browsers: same problem. Using them on other sites on the Web: no problem. Of course I disabled mod_deflate on the server (which should not compress images anyway), but the phenomenon remains. On my local développement server, running the same configuration, everything is Ok. Now I'm completely lost! For the record, my configuration: Ubuntu 10.04, Apache 2, Php 5.

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• apache2 mod_proxy without 301 moved permanently?

  - by Guy Sensei

  Is it possible to not send a 301 moved permanently response to the client when using mod_proxy? I would like the client to deal with the reverse proxy as opaquely as possible. My Virtual Host Settings- relevant snippet ProxyPreserveHost On ProxyPass /GTM http://192.168.1.27/GTM ProxyPassReverse /GTM http://192.168.1.27/GTM wget localhost/GTM --2011-09-27 21:54:22-- localhost/GTM Resolving localhost... ::1, 127.0.0.1 Connecting to localhost|::1|:80... failed: Connection refused. Connecting to localhost|127.0.0.1|:80... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: localhost/GTM/ [following] --2011-09-27 21:54:22-- localhost/GTM/ Reusing existing connection to localhost:80. HTTP request sent, awaiting response... 200 OK

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• How to boot from a flash drive OS using VirtualBox?

  - by kokbira

  I have two flash drive, one with Slax installed and another for Android x86 Live installed, but they do not boot in my laptop (in my work they boot perfectly). I can boot from some live CDs/DVDs or its ISO files using VirtualBox, but I cannot do it for live flash drives - I put the flash drives and start a VirtualBox without any virtual HD, but VirtualBox does not recognize them as boot options, as it does for CDs/DVDs. Any ideas? Any alternatives if VirtualBox does not support it? Edit1: I'm using Windows (Windows 7) but I would like to know how to do it in Linux (Ubuntu, for example) too.

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• Monitoring remote laptops

  - by kaerast

  We're looking for something to monitor around 30 remote laptops that are constantly out on the road, never returning to base except for when there are serious hardware faults that need repairing. These laptops won't always be connected to the internet, they'll have mobile broadband and may work offline most of the time. They will be running a mixture of Windows XP, Vista and 7 and there is currently no server setup. We're primarily interested in making sure that Windows Updates and antivirus updates are happening, and I guess we should also be monitoring remaining disk space, what software is installed and ideally hardware health. It might also be nice if we could gain remote access to perform work on them. My main reason for wanting to monitor them is that it's going to be a real pain to get them back to base if anything goes wrong, so I want to be proactive in ensuring they last as long as possible. Can you recommend what I should be monitoring to ensure a long life? What tools would you use to monitor and maintain these computers?

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• dhclient configures /etc/resolv.conf with invalid entry

  - by kubal5003

  I'm trying to figure out why running dhclient on my interface sets /etc/resolv conf to the ip number of my gateway(router). This entry is invalid and each and every time causes inability to resolve any address. I would like to: stop dhclient from overwriting the /etc/resolv.conf or make dhclient write there the valid dns ip from my router More on the environment: I'm using virtual Debian Wheezy as a client system on Windows Seven x64. It is run by Virtualbox with networking mode set to bridged (all packets from debian are injected to my network interface on windows). If I manually configure the /etc/resolv.conf then everything works fine. Doing this on every boot is quite annoying.. PS I know I can write a script to do it for me, but this is not the solution I want. //edit router ip: 192.168.1.100 /etc/resolv.conf AFTER running dhclient eth0: "nameserver 192.168.1.100" what I would like the /etc/resolv.conf to look like: "nameserver 89.202.xxxx" (I don't have to provide the real ip do I? )

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• What could explain my partitions disappearing on a new SSD with Windows 7?

  - by charlesrandall

  So this morning, I had a fresh install of Windows 7 pro, on a new SSD (Patriot TorqX 128gb), which I just put in to a new Dell Studio XPS 9000. Everything was fine. I booted to windows, no problem. I go to work. 8 hours later, I come home, and I'm greeted by my boot screen complaining about no bootable devices. Windows repair from the Windows 7 pro disk says it can't fix the problem. It doesn't see any windows installs. I boot up GParted, and my SSD is completely unallocated. No space used, no partitions. Perhaps this is related to allowing windows 7 to create a utility partition when I installed? Only thing I can think of. Is there some kind of known hardware issue that can result in an SSD completely wiping itself?

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• What is a fairly accepted endpoints to concurrent calls ratio for a PBX?

  - by Logan Bibby

  Hey guys! Not too positive about the relevance of this question to Server Fault, but I'll let you guys poke around at it anyway. :) I'm trying to figure out what an accepted ratio of endpoints to concurrent calls on the "average" office PBX. I'm defining concurrent calls as any call being placed, including internal calls. I'm not going to be considering call centers into this ratio, I'll be looking at those differently, anyway. To give you guys a little history behind the question: I need this ratio to be able to figure out decent specs for a virtual PBX service I'm going to be rolling out within the upcoming months. The ratio will determine the number of trunks needed per PBX system. -- Logan

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• Photoshop CS4 slowing down, need advice to improve speed.

  - by Pennf0lio

  Hi, I just recently experienced problem with my Photoshop, It seem that it is slowing down when I am doing graphics design. Big or small files ( from 20 x 20 inch 300 dpi of resolution to 800x600 72 resolution ) it is really slowing down. Particularly when I am panning to my project It just get stuck for a few seconds then back to normal with slow movement. Can you guess what's wrong? I have an updated antivirus and I don't think virus is causing it. other adobe suite is working fine just my photoshop. I am running in windows 7, using Intel Core2 Duo 2.40 Ghz and has an Installed Ram of 2 GB. My primary scratch disk has 21 Gigabyte left and the secondary has a 13.89 GB. I need a solution urgently. I am planning to reformat my computer just to resolve my problem.

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• Redirect an Apache2 SSL VirtualHost with mod_alias

  - by Jeff

  I want to make sure there aren't any odd behaviors that I don't know about when redirecting a SSL VirtualHost with mod_alias Redirect as outlined by Apache here. My code seems to work, but since SSL virtual hosts are restricted to just one IP address, I want to make sure there aren't any problems eluding me. Explicitly not using TLS. I'm stuck with Apache 2.2 for now. <VirtualHost *:443> ServerName example.com SSLEngine On Redirect 301 / https://www.example.com/ </VirtualHost> <VirtualHost *:443> ServerName www.example.com SSLEngine On # Do stuff # </VirtualHost> So I guess my question is, should SSL VirtualHost redirection with mod_alias Redirect work the same as non-SSL redirection?

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• Will this increase my VPS failing rate ?

  - by Spencer Lim

  Will this increase my Virtual private Server failing rate if i :- install Microsoft Window Server 2008 Enterprise install SQL server enterprise 2008 install IIS 7.5 install ASP.Net Mvc 2 install Microsoft Exchange install Team foundation server on one mini VPS with specification of DELL Poweredge R710 shared plan DDR3 ECC RAMs 16GB and -- 1GB for this VPS using DELL PERC 6i raid controller (this thing alone about 1.5k-2k) and the SAS HDD (15K RPM) (146GB) -- 33GB to this VPS each hdd is freaking fast over 300MB read / write possible with proper tuning the motherboard is a DELL and it has twin redundant PSU (870watt 85%eff) its running on Intel Xeon 5502 (Quad Core) x2 so about 8 physical proc (fairly share) is there any ruler for this about one VPS can only install what what what service ? Thx for reply

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• Access Bind9 DNS in Virtualbox on Host

  - by Philipp Melab

  I've set up a Ubuntu 10.04 Virtual Box with a Bind9 DNS server. The Box has a NAT Network connection for internet access and a host-only adapter for static ip connections from the host (OSX Lion). Thats the only way i managed to get internet and static ip inside the box, guess there is a better one ... The DNS works fine from inside the virtualbox, but not from the host. The http and ftp on the guest system is accessible via both addresses, so connection between host and guest are fine i guess. I tried to add both IP's as name servers. I'm completely new to Bind9 and DNS configuration. Anybody has a hint for me whats wrong? Or how i have to configure the DNS server?

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• Running PHP scripts as the owner of the PHP file: security issues

  - by thomasrutter

  I'm using suexec to ensure that PHP scripts (and other CGI/FastCGI apps) are run as the account holder associated with the relevant virtual host. This allows for securing each users' scripts from reading/writing by other users. However, it occurs to me that this opens up a different security hole. Previously, the web server ran as an unprivileged user, with read-only access to user's files (unless the user changed the file permissions for some reason). Now, the web user can also write to user's files. So while I've prevented different users taking advantage of each other's scripts, I've made it so that in the event that some application has a remote code injection vulnerability, it now has not only read access but also write access to all that user's scripts and website. How can I deal with this? One idea I've had is to create a second user account for each user account in the system, so that each user has their own user account, and all their scripts are run under another user account. But that seems cumbersome.

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• Application to store/browse/view photos?

  - by amorfis

  I am looking for application which I can install on Ubuntu server and put my photos there. It can be by web interface, it can be by mounted samba disk. What I require: Ability to add tags to photos. Ability to move photos. I.e. if I set photos directory to /home/photos, but then I want to move all photos to e.g. /home/common/photos - I don't want to lose all the tags. I used to use FSpot and it was great, but it lacked point 2, and I lost everything :(

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• Unable to connect to a remote SQL Server Instance over a VPN

  - by Jack Njiri

  I'm running SQL Server 2005 on two different servers running Win XP. The two servers are in different physical locations and are connected via a dedecated point to point data link in a virtual private network(VPN). Im only able to connect to the remote instance of SQL Server by specifying the IP address on the server name property. If I provide the actual server name say 'ServerA', then I get an error message. Everything works fine except configuring replication at the subscriber level, which requires the actual name of the instance, not an IP address or alias. I have already configured both instances on allow remote connections and im running the SQL Server Browser. How do I connect to the remote instance by providing the instance name? Alternatively how I configure subscription to a remote publisher without supplying the remote instance name?

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• Windows Update cannot currently check for updates, because the service is not running

  - by Lee

  This morning I attempted to run Windows Update on two of my Windows 7 PCs (both are virtual machines), and I ran into this interesting pop-up error message. I have never encountered this problem before, so I was somewhat perplexed. From the message, my first thought was to see if the Windows Update service was running. It was. As usual, the solution is never so simple. I attempted to restart the service and reboot the PCs to no avail. So, I am off to the interwebs for a solution. I did find a solution to the problem, so I thought to post it for my future reference and for anyone else who may encounter this problem. I will be posting the answer shortly. If you have alternate solutions that have worked for you, please feel free to leave a post or comment.

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• Apache2 memory usage when uploading large files

  - by abhaga

  Hi, I am running apache2.2.12 along with PHP 5.2.10. PHP is configured to run as a separate process through fcgid. The problem is that when users upload a file, size of the apache process swells by almost the same amount. So if somebody tries to upload a 200 MB file, one of the child process swells to current size+200 MB. If 2 users simultaneously start uploading, my server crashes. Now it is the virtual memory size which is increasing but since I am on a OpenVZ based VPS, that is what counts. My questions are: Is it the normal Apache behavior or can I do something to fix this? If not, is there a more memory efficient way of handling big file uploads. Going by the current behavior, I will need 1 GB of free RAM for every apache child accepting a upload. Thanks! Abhaya -

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• Most efficient Way to setup a game server

  - by alex bowers

  I'm running a PHP based game which has over 45 Million members predicted for end of this year (2011) Currently we are on 7.5 Million, this game is being ran on facebook and I am in desperate need to help get this game server as efficient and as powerful as possible. it is a dedicated server with Processor Manufacturer Intel Model i7 920 Frequency 4x 2x 2.66 GHz NIC GigaEthernet RAM 12 GB Hard disk 4 x 1 TB specs. It has apache installed, cPanel, phpMyAdmin, several apache mods and MySQL. The game also runs 47 mysql calls per second per user. Is there any alternatives to the above which could be faster, more efficient etc? I dont mind having to recode the game to fit to it, as long as it maximises our upper limit of members on the game. Thanks Also, is there a way to tell what our maximum limit to players, database calls etc is? Thank you again, hope you guys can help :)

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• Dell V105 printer and OS X 10.6

  - by James

  I am trying to get a Dell V105 printer to work with my iMac. It is running 10.6 and I have installed all the drivers on the Snow Leopard disk. I believe there is no official Dell driver but I have also heard the Dell printers are made by third parties that may sell the same printer under different names. There a quite a few Lexmark models that seem to look very similar and I have tried setting the driver to the 2600 series that looks very similar but that has not enabled me to print. Although it claims to give me the supply levels correctly. Can anyone help? Thanks for your time

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• How would I put together a site requiring several TB? [closed]

  - by acidzombie24

  Lets say I have a site with unmetered 100MBPS bandwidth (i assume its bits?) and the ram i require. Most plans i see offer HDD that hold 250gb and 1TB. But what happens if i compile/generate enough data that i require 10tb or 25tb? (I'd likely have two servers but...) I wouldn't be serving all of that data (well not to the public) so CDN wouldn't make sense. What do i do in this scenario? Do I need to get a custom plan from a hosting provider? (if so how do i find them?) Are there services that allow me to mount remote drives (that sounds wrong unless its a CDN so maybe not). Are there host that deals specifically with unmetered bandwidth and provides lots of disk space? Math says ~1TB is the most i'll ever need but if i happen to need more i'd like to know my options.

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• Can KVM CPU assignment count differ from physical hosts CPU count?

  - by javano

  I have read this question. I knew already that I could for example, have a quad core machine with four guests each having two vCPUs. As they don't all be require 100% CPU usage all the time, the scheduler would handle this for me. My question is about how this relates to a fail-over or migration situation; If host1 has two dual-core CPUs, and I assign guest1 four vCPUs (so it accessed all four physical cores), what will happen if I try and migrate it to host2 which only has one dual-core CPU? Can qemu-kvm emulate more vCPUs than there are physical? Or would I have to shut down the virtual machine, change the CPU assignment, migrate it, and then boot it back up (so no live migration)? Many thanks.

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• Security issues of running PHP scripts as the owner of the PHP file with suexec

  - by thomasrutter

  I'm using suexec to ensure that PHP scripts (and other CGI/FastCGI apps) are run as the account holder associated with the relevant virtual host. This allows for securing each users' scripts from reading/writing by other users. However, it occurs to me that this opens up a different security hole. Previously, the web server ran as an unprivileged user, with read-only access to user's files (unless the user changed the file permissions for some reason). Now, the web server can also write to user's files. So while I've prevented different users taking advantage of each other's scripts, I've made it so that in the event that some application has a remote code injection vulnerability, it now has not only read access but also write access to all that user's scripts and website. How can I deal with this? One idea I've had is to create a second user account for each user account in the system, so that each user has their own user account, and all their scripts are run under another user account. But that seems cumbersome.

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• Stream Music To Ventrilo From ESXi VM

  - by omghai2u

  I would like to stream music to my Ventrilo server from a Windows XP virtual machine running on an ESXi host. I have followed the instructions outlined here to stream music from something like VLC to the Ventrilo server on another machine and it works fine. I have also added the lines: sound.present = "TRUE" sound.virtualDev = "es1371" sound.fileName = "-1" sound.autodetect = "TRUE" to my .vmx file, as suggested here (http://communities.vmware.com/thread/191878), to get a sound card in my VM. The problem I am having is that it seems that my VM is not outputting any sound, so there's nothing to stream through Ventrilo. The Device Manager on the VM shows that this new sound card has drivers and doesn't appear to have any concerns with it. Can someone point me in the right direction to get my desired outcome? Thanks! PS. sorry for the long 2nd link, apparently I can only post 1 hyperlink with this low reputation.

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• Windows XP runs New Hardware Wizard for usb keyboard and mouse, can't find drivers

  - by Randy Orrison

  I have a PC that up until a couple days ago was working fine. I moved it from one site to another and now when I plug in the USB mouse or keyboard (the same ones that were working previously) XP brings up the New Hardware Wizard. Going through it, the correct keyboard and mouse are identified, but XP can't find the drivers. I've tried manually searching for the driver (using the Have Disk option) - the first file it's looking for is in the c:\i386 directory, but that installs a generic HID mouse device; the system then runs the hardware wizard for a new "unknown" device. The system was SP2, I have installed SP3 in hopes that would help, and I've also downloaded and installed the mouse drivers from Dell's site (there are no specific drivers for the keyboard), with no change. Before I completely reinstall XP, is there anything else I should try?

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• How can I peer into a Windows user's RDP session for support, where I initiate the support session?

  - by David Bullock

  I've used both WebEx and GoToAssist, but neither of them have a story to tell for 'unattended' access of a user's desktop unless the user is using the machine's primary console. Unattended in the sense that they phone me and I then appear in their session, rather than they visit a website and enter their details and wait for me. This is a common use-case, since the users' machine is a virtual desktop, and the session broker is connecting the user via RDP. They never have a session with their desktop unless it's a remote desktop session. At the moment, if I use either of the said products to get an unattended support session going, all I can see is the login screen of the physical console, telling me that a remote session is in progress. Are there alternative tools which will make me happy?

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• Mails bounce because of invalid character ('@') in username

  - by user1598585

  I have a working exim setup with virtual users, working alright, except for when I try to send email to certain servers. These servers reject my emails because of #5.1.3 Invalid character ('@') in username. The offending header parts seem to be: Return-path: <"[email protected]"@smtp.example.com> and ...(envelope-from <"[email protected]"@smtp.example.com>)... The problem is that I cannot find where and why the usernames are being generated like this. My router for submission is: dnslookup: driver = dnslookup domains = ! +local_domains transport = remote_smtp ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 no_more And the respective transport: remote_smtp: driver = smtp What can be producing this problem?

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