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  • Configure Postfix to allow incoming mails only from one (defined) mail-id

    - by Saurabh
    I have set-up Postfix with Spamassassin on Ubuntu 12.04.5. Fundamental usage of Postfix is to (pipe) trigger a PHP file. Till here I've arrived successfully. Now, to avoid unneccessary load on the server, and also to avoid unwanted mails triggering my PHP script, I want to configure Postfix to allow mails only from [email protected] and reject everything else. How to achieve this absolute lock-down on mail server unless mail comes from [email protected]?

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  • Removable Disk Drives Not Appearing

    - by user24416
    OS: Vista, SP1 My SD/MMC drive does not appear anywhere (MyComputer, Disk Manager). In My Computer the only available drives ar C:\, D:\ and J:. I can no longer view any removable disk drives. When I put my SD card into its slot, it doesn't get read at all. I can't load pictures from my card to my PC. Any insight would be greatly appreciated. Thanks!

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  • Can't open my messages in facebook?

    - by Ehsan Mamakani
    I was up to sending a very long message, about 90,000 characters, to a friend, I tried several times but I got error sending the message. Finally, I think part of my message was sent because I could see the characters in my message list under my friend's name, but when I clicked the name to see my whole message it wouldn't load the message. And NOW I can't access any of my messages and I get this message from facebook how can I get access to my messages and conversations again?

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  • Skip kernel module at boot

    - by Gris
    Hello. There is a broken kernel module, due to which I can not even load the OS, so I can not delete or fix it. Is it possible to skip this module at boot, using the kernel's parameters or something? Thanks.

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  • Serving a video and audio upload and streaming intense site

    - by Pollux Khafra
    I'm about to launch a new site that allows user to both upload/stream audio and video and I don't know anything about the server side of things. My original plan was to just use a dedicated server through Hostgator but from what I'm reading, Cloud hosting or Load balanced clustered is the best way to go for what Im trying to do. All the articles seem to have an agenda to sell you on an affiliate web host so how do I really need to do this?

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  • 500 error after creating htpasswd and edit htaccess

    - by bacord
    I just edited the htaccess file to include: AuthType Basic AuthName "My Protected Area" AuthUserFile /home/path/to/public_html/ Require valid-user I then created a htpasswd file via the htpasswd command. I have enabled the module: LoadModule authn_file_module modules/mod_authn_file.so in the Apache configuration. Now, when I load the page I now get a 500 error and apache log says "configuration error: couldn't check user. No user file?: /"

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  • Can't login to Debian (OpenVZ guest) server after setting up IPTables. How to Fix it?

    - by EApubs
    I have an OpenVZ VPS server with Debian. I just setup IPTables to allow the SSH port rebooted it. (Also set the rules to auto load on startup). Now I can't login to the server! How to fix this? Here are the rules : Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:325 DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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  • Swap implication in Linux and way to increase it

    - by vimalnath
    I used top command to print this on Linux box: [root@localhost ~]# top top - 23:38:38 up 361 days, 12:16, 2 users, load average: 0.09, 0.06, 0.01 Tasks: 129 total, 2 running, 126 sleeping, 1 stopped, 0 zombie Cpu(s): 0.0% us, 0.2% sy, 0.0% ni, 96.5% id, 3.4% wa, 0.0% hi, 0.0% si Mem: 2074712k total, 1996948k used, 77764k free, 16632k buffers Swap: 1052248k total, 1052248k used, 0k free, 331540k cached I am not sure what Swap:0k free means in the last line. Is this normal behavior for a linux box to have value of 0 Thanks

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  • Something is preventing incoming connections in Windows XP

    - by VarunDotCuDotCc
    I want to test Apache Server on my PC. When I visit my site from my PC at 127.0.0.1 or by typing my IP, it works. But when I try viewing my site from another PC by typing my IP, the site didn't load. I only see some data transfer activity on the PC on which the site is hosted. Note, I have tried installing different server software, disabling firewall and creating a connection as incoming connection, but nothing works.

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  • Chrome becomes totally unresponsive - Linux Mint

    - by SpyrosR
    Iam running Linux Mint on my laptop and i have some (serious) problems with Google Chrome.Randomly Chrome becomes totally unresponsive and iam not able to do anything,except restart the system from the power button.I think it's not an issue with system load and/or RAM,because if i for example open lot of "heavy" programs everything seems to work quite fine.When i only run Chrome with not many tabs at random times it freezes the whole system.The weird thing is that Chrome is not heavily loaded with tabs or extensions.I can't figure out what is causing this problem.Any suggestion?Thank you in advance.

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  • GNU Emacs is crashing with -nw

    - by Jack
    When I run emacs with -nw option, the emacs really open, but I can't do more nothing. As if the user input is blocked and no keyboard signal is received and/or interpreted. I've tried run without load .emacs file and some other behaviors: emacs -nw -Q --no-desktop --debug-ini foo.c But makes no difference and strangely the GUI-version(using Gtk) is working fine. My gnu-emacs version is GNU Emacs 23.3.1 Any help to help to fix it is very appreciated.

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  • On ESXi, guest machines hang for significant intervals compared to real machines. How can I fix this?

    - by Tarbox
    This is ESXi version 5.0.0. We plan on upgrading to 5.5 eventually. I have four code profiles, two taken on a real, unvirtualized machine, two taken on a virtual machine. Ordering the list of subroutines by time spent in each one, the two real profiles are practically identical. The two virtual profiles are different from each other and from the real profiles: a subset of subroutines are taking a lot more time on the virtual machines, and the subset is different for each run. The two virtual profiles take a similar amount of time, which is 3 times the amount of time the real profiles take. This gross "how long does it take?" result is consistent after hundreds of tests across three different virtual machines on two different host machines -- the virtual machine is just slower. I've only the code profiling on the four, however. Here's the most guilty set of lines: This is the real machine: 8µs $text = '' unless defined $text; 1.48ms foreach ( split( "\n", $text ) ) { This is the first run on the virtual machine: 20.1ms $text = '' unless defined $text; 1.49ms foreach ( split( "\n", $text ) ) { This is the second run on the virtual machine: 6µs $text = '' unless defined $text; 21.9ms foreach ( split( "\n", $text ) ) { My WAG is that the VM is swapping out the thread and then swapping it back in, destroying some level of cache in the process, but these code profiles were taken when the vm in question was the only active vm on the host, so... what? What does that mean? The guest itself is under light load, this is a latency problem for my users rather than throughput. The host is also under a light load, if I knew what resources to assign where, I could do it without worrying about the cost. I've attempted to lock memory, reserve cpu, assign a restrictive affinity, and disable hyperthread sharing. They don't help, it still takes the VM 2-4x the amount of time to do the same thing as the real machine. The host the tests were run on is 6x2.50GHz, Intel Xeon E5-26400 w/ 16gigs of ram. The guest exhibits the same performance under a wide combination of settings. The real machine is 4x2.13GHz, Xeon E5506 w/ 2 gigs of ram. Thank you for all advice.

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  • Where is the statusbar in Firefox 4? How do I get it back?

    - by lovinglinux
    Since version 4.0b7pre, there is no more statusbar in Firefox, which has been replaced by the new add-ons bar. The main problem is that a lot of users like me are missing some valuable information that was displayed in the statusbar on previous versions. For instance, when hovering a link the url is now displayed in the address bar and you can't see the entire address. Other information like which servers are being contacted when you load a page are no longer displayed.

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  • Lightweight ad-blocker for firefox

    - by student
    On a old machine (512 MB RAM) I am currently running ubuntu jaunty and firefox 3.0.15. I tried the ad blocker addon add block plus but it eats lots of RAM (300 MB). Is high memory load of this add-on a bug, which is fixed in a newer version or just normal? If so, why is the memory usage so high? Is there another ad blocker add-on for firefox or another browser- add-on combination for linux (ubuntu jaunty) which uses significant less RAM?

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  • Does Chrome use a different DNS server while Firefox and IE use a different one?

    - by Jian Lin
    Is the common set up for Chrome that it will use a different DNS server, while Firefox and IE will use a different one? My Chrome (including the one on the virtual PC) will sometimes "Resolving host" and wait there for 20, 30 seconds, while Firefox and IE won't. (so after 20, 30 seconds with a blank page, the page will finally not be able to load). So is there something that Chrome is doing that make the difference?

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  • How can I find out if a given program is 64 or 32 bit version?

    - by maaartinus
    How can I find out if a given program is 64 or 32 bit version? I can't to do it by simply looking at where it's installed, since some programs need no installer and may be put anywhere. Here, no process explorer will help me, since the application refuses to start. Reason why I need it: My new eclipse installation fails to load "jvm.dll" just like here. I'd bet I'm using 64-bit versions of both eclipse and JVM, but I'm slowly getting unsure....

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  • Cross-reference of computers having virtualization technology [closed]

    - by msorens
    When considering obtaining a new computer one of my prerequisites is the ability to load Windows 8 in a virtual machine (using VirtualBox). A prerequisite for that is that the host computer have virtualization technology. I located an Intel cross reference of chips having virtualization technology but I am trying to find a "higher level" cross reference between computer models and virtualization technology availability, skipping the extra step of having to first look up what CPU chip is in a machine, then cross-referencing that on Intel's list.

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  • Where is the statusbar in Firefox 4+? How do I get it back?

    - by lovinglinux
    Since version 4.0b7pre, there is no more statusbar in Firefox, which has been replaced by the new add-ons bar. The main problem is that a lot of users like me are missing some valuable information that was displayed in the statusbar on previous versions. For instance, when hovering a link the url is now displayed in the address bar and you can't see the entire address. Other information like which servers are being contacted when you load a page are no longer displayed.

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  • Debian or CentOS?

    - by Tres
    I am looking at using either Debian or CentOS for a production server and I've heard mixed reviews of each one. I've heard CentOS performs better under load, however I am aware that Debian has a much larger package repository. Personally, I am partial to Debian since I am less familiar with Red Hat distros, but wanted to reach out on Server Fault to see which I really should be using. Any ideas? Thanks!

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  • How to optimally configure memcache running on 16 cores 144G ram server?

    - by Ivko Maksimovic
    Memcache is the only important app running on the server Server has 16 cores and 144G RAM Memcache is given 135G Memcache runs at 32 threads Gigabit network, test shows at least 300Mbit/s availability on network port 600 connections 3000 requests per second Say that memcache (memory) usage is at 50% - it's definitely not full As we increase number of requests towards server, requests slow down (from 8ms to 100ms per request) but server load remains 0.00. We suspect this can be solved by adjusting configuration but we don't understand many of the configuration parameters (besides, maybe, the number of threads). Any ideas?

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  • slow startup of event viewer on windows 7 but fast on server 2008

    - by Tim
    Hi, Since switching to Windows 7 for my desktop I've started to get really p***ed off at the length of time it takes to start the event viewer to display the application event log (typically 20-30 secs or disk griding - presumably to load and cache all the events) I've just noticed that on server 2008 R2 it seems instantaneous. Is my experience typical? Is there any setting I can tweak to make it fast on Windows 7 as well? Tim

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