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Articles indexed Monday June 4 2012

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  • What is this very short power cable called?

    - by Portman
    I have a couple of networking components in my rack that take giant AC adapters ("power bricks") that don't fit neatly into my rackmount PDU. I have one "thingy" that is shown below, and I need to buy a few more. But I have no idea what I'm searching for because I don't know what the "thingy" is called. Yes, this drawing is terrible. I would ask my 4-year-old to draw it for me because she's a better artist, but she's taking a nap.

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  • Why is Internet access and Wi-Fi always so terrible at large tech conferences?

    - by Joel Spolsky
    Every tech conference I've ever been to, and I've been to a lot, has had absolutely abysmal Wi-Fi and Internet access. Sometimes it's the DHCP server running out of addresses. Sometimes the backhaul is clearly inadequate. Sometimes there's one router for a ballroom with 3000 people. But it's always SOMETHING. It never works. What are some of the best practices for conference organizers? What questions should they ask the conference venue or ISP to know, in advance, if the Wi-Fi is going to work? What are the most common causes of crappy Wi-Fi at conferences? Are they avoidable, or is Wi-Fi simply not an adequate technology for large conferences?

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  • How does Subnetting Work?

    - by Kyle Brandt
    How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? What is NAT (Network Address Translation). Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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  • My server's been hacked EMERGENCY

    - by Grant unwin
    I'm on my way into work at 9.30 p.m. on a Sunday because our server has been compromised somehow and was resulting in a DOS attack on our provider. The servers access to the Internet has been shut down which means over 5-600 of our clients sites are now down. Now this could be an FTP hack, or some weakness in code somewhere. I'm not sure till I get there. How can I track this down quickly? We're in for a whole lot of litigation if I don't get the server back up ASAP. Any help is appreciated. UPDATE Thanks to everyone for your help. Luckily I WASN'T the only person responsible for this server, just the nearest. We managed to resolve this problem, although it may not apply to many others in a different situation. I'll detail what we did. We unplugged the server from the net. It was performing (attempting to perform) a Denial Of Service attack on another server in Indonesia, and the guilty party was also based there. We firstly tried to identify where on the server this was coming from, considering we have over 500 sites on the server, we expected to be moonlighting for some time. However, with SSH access still, we ran a command to find all files edited or created in the time the attacks started. Luckily, the offending file was created over the winter holidays which meant that not many other files were created on the server at that time. We were then able to identify the offending file which was inside the uploaded images folder within a ZenCart website. After a short cigarette break we concluded that, due to the files location, it must have been uploaded via a file upload facility that was inadequetly secured. After some googling, we found that there was a security vulnerability that allowed files to be uploaded, within the ZenCart admin panel, for a picture for a record company. (The section that it never really even used), posting this form just uploaded any file, it did not check the extension of the file, and didn't even check to see if the user was logged in. This meant that any files could be uploaded, including a PHP file for the attack. We secured the vulnerability with ZenCart on the infected site, and removed the offending files. The job was done, and I was home for 2 a.m. The Moral - Always apply security patches for ZenCart, or any other CMS system for that matter. As when security updates are released, the whole world is made aware of the vulnerability. - Always do backups, and backup your backups. - Employ or arrange for someone that will be there in times like these. To prevent anyone from relying on a panicy post on Server Fault. Happy servering!

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  • Running OpenVZ virtual servers within a Xen XCP vritual server? Bad practice?

    - by Damainman
    I have a 1 server with 8GB RAM and 2xQuadcore Processors. It currently has the Xen XCP installed on it, and centos6.2 x64 running on a virtual machine. I have a server control panel software that I want to use and it allows the administration via a web interface for Openvz machines. My questions are: Would this be considered bad practice? Would there be a big performance hit? Should I avoid this all together or am I going about it all wrong? Thank you in advance.

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  • avconv - not working with movflags

    - by MarKa
    With the Parameter "-movflags frag_custom" my avconv says [mp4 muxer @ 0x8d05f60] [Eval @ 0x7fffcc763f00] Undefined constant or missing '(' in 'frag_custom' [mp4 muxer @ 0x8d05f60] Unable to parse option value "frag_custom" [mp4 muxer @ 0x8d05f60] Error setting option movflags to value frag_custom. But with avconv is compiled with a mp4 muxer, so whats the problem ? Version is avconv 0.8.1-4:0.8.1-0ubuntu1

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  • Error in Apache: /var/run/apache2 not found

    - by Julen
    This is more self-answered question but since it drove me crazy I would like to share with the community and maybe someone can tell me why it happened or what it caused. The thing is I wanted to install in my Ubuntu 10.4 machine a CGI app, one built in the samples that come with the gSOAP toolkit. My intention was to access those from ASP .NET machine. Regular Ubuntu does not come with Apache so I install it from Sypnatic. Pretty easy. I followed this How to Install Apache2 webserver with PHP,CGI and Perl Support in Ubuntu Server. Instead of apache.conf I tweaked httpd.conf since a college here used that file instead of the first to put his Apache running. Besides I was able to access his CGI from my ASP .NET but mysteriously I could not from mine, I was getting always "The request failed with HTTP status 503: Service Temporarily Unavailable". Checking Apache error.log I found these messages: No such file or directory: unable to connect to cgi daemon after multiple tries: /home/julen/htdocs/cgi-bin/calcserver And looking more carefully whenever I restarted Apache I got this other message No such file or directory: Couldn't bind unix domain socket /var/run/apache2/cgisock. cgid daemon failed to initialize I am pretty new with Ubuntu and I could not think that Apache and Synaptic made a mistake in the installation process of the server, but it is true that the /var/run/apache2 was missing whereas in my college's computer was not. I tried to find and "elegant" solution but I found a post from 2006 that had an slight reference to it. Finally I decided to create the folder myself (as root) and then everything worked fine. Hope this helps others if they encounter a similar problem. Still I have the doubt why the folders was not created in the first place. Best, Julen.

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  • Linux SFTP and many local user accounts, limits with mount --bind?

    - by user123428
    I am in the process of building a solution to handle many developers (possibly hundreds) to work on their files via sftp, each one Jailed in their home directory. For our particular needs, we have a samba mount point that contains all of the users home directories. I have started developing the following solution and hit some walls: - I have configured a Ubuntu Lucid Server as sftp server. - In order to jail the user in their home directory (without allowing them the browse a directory up and seeing all the other users folders) I am using mount --bind and not a symbolic link (also some ftp clients don't really work with sym links). - The user accounts are local unix user accounts on the sftp server (not using a directory service or anything) that have an empty home folder created on the local machine, then I use mount --bind to bind the empty folder to the actual users home directory on the samba share. With this solution I am hitting a couple of problems, in the case of a server reboot, all the mount --binds are lost because they are not written in fstab. Then I have read somewhere that the maximum amount of entries in fstab are 400 (which does not really help us). I have thought of a solution of writing something that stores the mounts in a text file as a backup and on server reboot, run the script that re mounts. I am just really unsure about this whole process and was wondering if anyone has any insight on possibly a better solution for SFTP? (not FTP)

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  • How do I troubleshoot a server I can't get logged into?

    - by Karl
    This morning I am unable to log into SQL Server because it appears to be busy doing something, so much so that CPU usage is constantly at 98%-99%. I am guessing that something has gone wrong with the maintenance plan that ran over the weekend, but I can't get into the error logs see what is happening. On logging in I keep getting messages like "insufficiently memory in the buffer pool" and "the server is not responding". Is there any way I can figure out what is happening without logging onto to the server? Or some way I can squeeze in a login?

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  • How to redirect sitemap.xml used depending on the domain?Undo edits

    - by Agustín Sabater
    How I can redirect sitemap.xml file access to different subfolders, if it can be reached from three different domains? domain1/sitemap.xml - dominio1/es/sitemap.xml domain2/sitemap.xml - dominio1/de/sitemap.xml domain3/sitemap.xml - dominio1/uk/sitemap.xml domain1, domain2, and domain3 target to the same folder. Is it possible? How can I do this? Should do it with PHP ? PS: The server is a linux running apache, the web platform is a wordpress.

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  • filestream restore very slow to DR server

    - by Jim
    We are backing up a database containing 100GB of filestream data. The backup takes under two hours to write. Restoring the same database to the DR environment is taking over forty hours. We don't have the same problem with other (non-filestream) databases, including some that are much larger. How do we try and get to the bottom of the problem. The database is in full recovery mode, and we are doing a full backup. Thanks.

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  • Likelihood of a hard drive PCB replacement working?

    - by Grant Limberg
    I have a 1.5TB Seagate 7200.11 that died. The platter still spins up initially when attached to a machine, but then the drive clicks and spins down. Then the cycle repeats. I've found a few sites that sell replacement PCBs, however I don't know if the PCB is the issue, or something else. Given the symptoms above, is it at all likely that a PCB replacement would help? If not, I won't waste my money on the PCB replacement. Note: I put the drive in an external ESATA controller and tried hooking it up to a Linux box here at work and got some error messages in the logs. I can post them if anyone thinks it will help in determining whether a PCB swap would fix the problem I'm running into.

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  • How to change internal page numbers in the meta data of a PDF?

    - by YGA
    I have a pdf document I created through non-Acrobat means (printing to pdf, then merging a bunch of pdfs), but I'd like to manually change the page numbers (i.e. the first several pages are simply title pages, the page that is labeled "page 1" is really the 7th sheet of the pdf). What's the simplest (and ideally, free) way to do this? To be clear, I am not trying to change the numbers on the pages themselves, but the page numbers in the "metadata" that the pdf stores (the pages themselves are already numbered correctly; I just want "go to page 1" to go to the page labeled 1, which could be sheet 7). For what it's worth, I'm on Windows, though I have access to Macs as well.

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  • Outlook 2003 attachment section disappearing

    - by Pitto
    When I open a received mail my attachments "disappear". If I restart the application my attachments are there once again. After opening 4 - 6 email the problem is back there and I have to open / close the app again. I use windows 7 32bit professional and sp3 outlook 2003. In the 1st pic you can see the problem... In the 2nd one I've just quit outlook and opened it again (same email). Any hints?

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  • Why can I not use the full capacity of my SSD?

    - by bcmcfc
    I am using Paragon to migrate Windows 7 to an SSD. The C drive which should be migrated is a 100GB partition. During the process, Paragon formats the SSD to 80GB. Why doesn't it take the 100 GB? It later fails because it thinks there isn't enough space on the SSD. However the SSD is 11GB bigger than the partition, and only 45GB of the partition were used anyway. How do I get around this? Is there another tool to do the same job which does it better ?

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  • How to read iptables -L output?

    - by skrebbel
    I'm rather new to iptables, and I'm trying to understand its output. I tried to RTFM, but to no avail when it comes to little details like these. When iptables -vnL gives me a line such as: Chain INPUT (policy DROP 2199 packets, 304K bytes) I understand the first part: on incoming data, if the list below this line does not provide any exceptions, then the default policy is to DROP incoming packets. But what does the 2199 packets, 304K bytes part mean? Is that all the packets that were dropped? Is there any way to find out which packets that were, and where they came from? Thanks!

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  • Batch convert AppleWorks files into PDF within originating folder, delete original file?

    - by Manca Weeks
    Probably AppleScript is the way to go with this - I have found scripts online that do this, but snag on oversize printable area and put files in the same folder - I need files to stay in the folder the source came from. If the script also deleted the original AppleWorks file, that would be even better, but not required. I have tried the last script from this post: https://discussions.apple.com/message/10127260#10127260#10127260 Any suggestions would be much appreciated.

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  • How can I resolve "A clock interrupt was not received on a secondary processor within the allocated time interval."?

    - by dimas bimayakti
    I've been troubled by my laptop problem lately. It always blue screen error every time I use it. Every time it becomes blue screen it shows: A clock interrupt was not received on a secondary processor within the allocated time interval. I don't understand what it means, and I even bought a new HDD and RAM, I also haven't install new programs but the blue screen always appears. Is there anyone who has same problem with me and knows how to solve this problem

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  • Remap key combinations in Windows

    - by nickf
    This question is similar to this one, but the accepted solution doesn't work in my case. I work on two different laptops. On one, the Home and End keys are only available by pressing Fn+Left and Fn+Right. This can make it rather annoying when switching between the two since I always go to press Fn-Right and not get what I want. The tool suggested in the other question is Sharpkeys, however it doesn't recognise Fn+Right as a different key from Right, and I suspect that registry twiddling isn't going to help me here. (?) Is there any way to remap this combination? (I'm on Windows Vista if that helps)

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  • Why does the Mobile Safari Browser on iOS not allow file uploads? [migrated]

    - by Kirinriki
    As already known, it's not possible for iOS users to select image files to upload from Safari on iPhone, because the browse button to display the "select file"- dialog is disabled. It works fine on Android, but not on iPhone... What is the particular reason for that issue? I heard that the browse button is disabled because there isn't a file browser on the iPhone. Someone other said that Safari just disabled root access. Is there any reliable source which explains the issue? (I need it for my thesis.)

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  • Does anyone have experience with BSODs while creating a universal image with FOG?

    - by Devator
    I want to create a Windows XP universal image to image our computers using FOG server. The FOG server part is running fine, however when creating a Windows XP universal image, it keeps crashing (BSOD) with the 0x000007b error. I believe this has todo with the Mass Storage drivers, I followed many tutorials, but each of them crashes with the 0x000007b error. FYI, I followed this tutorial (but couldn't download the files, the host is down). I was wondering if any of you had experience with this and knows how to solve my problem?

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  • Unable to use cloned VM, OpenSUSE, VirtualBox

    - by Kremchik
    I've cloned a VM and now while booting it I see a message: Trying manual resume from /dev/sda1 Invoking userspace resume from /dev/sda1 resume: libgcrypt version: 1.5.0 Trying manual resume from /dev/sda1 invoking in-kernel resume from /dev/sda1 Waiting for device /dev/disk/by-id/ata-VBOX_HARDDISK_.....-part2 to appear: ... Could not find /dev/disk/...-part2 Want me to fall back to /dev/disk/...-part2 (Y/n) If I press 'Y' it tries to boot again with failure, then exits to /bin/sh. If I press 'n' it exits to /bin/sh immediately. I've read a solution here: http://diggerpage.blogspot.com/2011/11/cannot-boot-opensuse-12-after-cloning.html but I don't understand how to access files on disk to edit /etc/fstab and /boot/grub/menu.lst?

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  • How could I embed formatted XML source in WORD documents?

    - by eckes
    I'm writing a documentation with WORD that contains XML source code (whole files) as examples. The way I'm embedding the currently XML is quite cumbersome and doesn't seem to me as really maintainable: I'm finishing the editing of the document in WORD and create a PDF from it using Acrobat next, I open my XML files (2x input files, 2x generated output files) with IE and print them with the PDF printer supplied by Acrobat now, I open up Acrobat Pro and attach the four XML-PDF files to my original document The problem with that work flow for me is that it involves too much manual labor in order to get the documentation done. What I've tried up to now is not really satisfying for me: converting each XML to PDF and appending them like described above opening the XML files with SCiTE, copy as RTF and paste into Word playing around with the LaTeX packages minted, pygments and listings (I could write the docs with LaTeX too) but found some unsolvable problems in each of these packages I'm searching for a way that produces my documentation more automatic. For example embedding the XML files including formatting of IE (which I find quite readable). The files should be included by reference so that I don't have to paste the XML sources manually every time the XML changes.

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  • How do I set up Grub properly to quad-boot Windows, Mac OS X, Linux, and FreeBSD?

    - by Joe
    Grub has gone completely insane on me. My quad-boot system was working great up until I upgraded Ubuntu to 12.04. Since Ubuntu overwrote the Grub stuff I had to repair it with my Mac OS X and FreeBSD entries. After this, trying to boot Mac OS X gave me the error "couldn't open file" and FreeBSD gave the error "no such partition". Windows and Ubuntu worked fine. So I tried repairing again because I figured something must've gone wrong in the install process. Then only Ubuntu would boot. Trying to boot Windows would give me the error "no argument specified". I tried repairing Grub once again, since I seemed to be getting different results each time. This time, Ubuntu no longer appeared in the Grub menu, and the errors for the other OSes were the same. So I booted into the Ubuntu 12.04 live CD and ran Boot-Repair with recommended settings. Now Grub is completely skipped and Windows boots up. I have absolutely no idea what is going on or why I get different results every time I reinstall Grub. Here is how my partitions are set up: sda1 - Storage drive, sdb1 - Windows, sdb2 - Mac OS X, sdb3 - FreeBSD, sdb4 - Extended, sdb5 - Ubuntu, sdb6 - Shared storage, sdb7 - Shared Storage, Here's my grub.cfg file: grub.cfg

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  • Dropbox context menu missing in OS X

    - by slhck
    Problem My Dropbox context menu is missing in OS X Snow Leopard (10.6.8). While the Dropbox service runs normally, Finder doesn't show the icons and also doesn't give me the ability to browse files on the website or copy the public link. What I've tried Removed ~/.dropbox and ~/Dropbox/.dropbox.cache Reinstalled Dropbox.app (both 1.4.7 stable and 1.5.0 experimental), went through the setup again Restarted Finder Logged out and back in All of these I've done over and over again, in random permutations. I've made sure that Dropbox appears in the Login Items under my Account (and I've never touched that) I don't know if ~/Library/Contextual Menu Items is missing the Dropbox plugin or if there shouldn't be one after all. In any case, I can't get the icons or the menu to appear.

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