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• Is USB supported in safe mode on XP?

  - by Hugh Allen

  According Microsoft, "Universal Serial Bus Devices Do Not Work in Safe Mode" under XP. However, in my testing this is incorrect. USB keyboards, mice and flash drives seem to work fine in safe mode (I made sure the BIOS was not providing support). This makes sense because a failure of a standard input device would be, in Microsoft parlance, a "bad user experience". So, Is USB supported in safe mode on XP? If your answer is no (agreeing with Microsoft), please provide a test case, preferably in a virtual machine, where a standard HID keyboard or mouse fails. Please state hardware / BIOS / OS configuration. Note that you will need a PS/2 keyboard attached in addition to your USB device(s) in order to use the boot menu. Virtual machine software usually emulates a PS/2 keyboard. Alternatively, you could add the /safeboot switch to boot.ini. If your answer is yes, please provide a link to some supporting documentation (either from Microsoft or someone authoritative). Your answer might be "devices X, Y and Z are supported but nothing else", in which case also give a link.

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• Options for small windows network setup without dedicated server?

  - by Mitch

  I'm very weak on networking and hope someone can point me in the right direction: I have written some windows client/server software which incorporates a database which is located on a windows server. I have a test installation running at a customer's office where the server has a static IP address. In this case its easy for the clients to access the database because of the fixed IP address. Also, customers with network servers generally have specialist support staff to set up my software, so its not such a problem for me. However I also need to offer the software to customers who have small offices with less than 10 PCs and no dedicated network server. In this case I want the customer to be able to nominate one PC as the database "server" and install my software and have the clients access it. But in this situation I believe the "server" PC may not have a dedicated IP address. Q1: What is the best way to set this up simply and make it work? Can I reliably reference the "server" by using its name, or is there a way to assign dummy fixed IP addresses? Ideally this needs to be workable on small networks running a mixture of XP/Vista/Windows7 as my target market may well have mixed OSes etc. I guess this would be akin to home networking? Many thanks Mitch

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• Linux authentication via ADS -- allowing only specific groups in PAM

  - by Kenaniah

  I'm taking the samba / winbind / PAM route to authenticate users on our linux servers from our Active Directory domain. Everything works, but I want to limit what AD groups are allowed to authenticate. Winbind / PAM currently allows any enabled user account in the active directory, and pam_winbind.so doesn't seem to heed the require_membership_of=MYDOMAIN\\mygroup parameter. Doesn't matter if I set it in the /etc/pam.d/system-auth or /etc/security/pam_winbind.conf files. How can I force winbind to honor the require_membership_of setting? Using CentOS 5.5 with up-to-date packages. Update: turns out that PAM always allows root to pass through auth, by virtue of the fact that it's root. So as long as the account exists, root will pass auth. Any other account is subjected to the auth constraints. Update 2: require_membership_of seems to be working, except for when the requesting user has the root uid. In that case, the login succeeds regardless of the require_membership_of setting. This is not an issue for any other account. How can I configure PAM to force the require_membership_of check even when the current user is root? Current PAM config is below: auth sufficient pam_winbind.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth required pam_deny.so account sufficient pam_winbind.so account sufficient pam_localuser.so account required pam_unix.so broken_shadow password ..... (excluded for brevity) session required pam_winbind.so session required pam_mkhomedir.so skel=/etc/skel umask=0077 session required pam_limits.so session required pam_unix.so require_memebership_of is currently set in the /etc/security/pam_winbind.conf file, and is working (except for the root case outlined above).

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• Do you really need cable management for a cabinet with just switches and patch panels?

  - by ObligatoryMoniker

  We are about to start wiring out a building expansion and our vendor has laid out the racks in the following configuration: Option 1 1U Fiber patch panel 2U Cable Manager 2U 48 port Patch Panel 2U Cable Manager 2U 48 port Patch Panel 2U Cable Manager 1U 48 port Switch 2U Cable Manager 1U 48 port Switch Total = 15U All the patch panels would be connected to the switches with 1ft+ cables fed through cable management. What I am considering instead is: Option 2 1U Fiber patch panel 1U 24 port Patch Panel 1U 48 port Switch 2U 48 port Patch Panel 1U 48 port Switch 2U 48 port Patch Panel Total = 8U All of the patch panels would be connected to the switches with .5 ft cables directly on their face with the top 24 ports of each switch patched to the patch panel above it and the bottom 24 ports of each switch patched to the patch panel beneath it which would not require any cable management. If I go with option 2 it save all of the space used by cable management and allows us to keep adding on switches and patch panels at the end without having to re-cable all of the patch panels above. Our vendor has indicated that this is not best practice and that .5ft cables will introduce cross talk. I could understand that being the case if we were connecting the .5 ft cable directly into another switch but we are connecting it to a patch panel that likely has another 150 ft cable run from the back of the patch panel out to the port in the building in which case the real resulting cable is 150.5 ft at minimum before even connecting it to a PC. It seems like it makes much more sense to go with option 2. It is easier to expand, saves space, and saves money on cabling and cable management. Does this kind of configuration make sense or is there a legitimate reason to choose Option 1 over Option 2?

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• How to pass alias through sudo

  - by Tanktalus

  I have an alias that passes in some parameters to a tool that I use often. Sometimes I run as myself, sometimes under sudo. Unfortunately, of course, sudo doesn't recognise the alias. Does anyone have a hint on how to pass the alias through? In this case, I have a bunch of options for perl when I'm debugging: alias pd='perl -Ilib -I/home/myuser/lib -d' Sometimes, I have to debug my tools as root, so, instead of running: pd ./mytool --some params I need to run it under sudo. I've tried many ways: sudo eval $(alias pd)\; pd ./mytool --some params sudo $(alias pd)\; pd ./mytool --some params sudo bash -c "$(alias pd)\; pd ./mytool --some params" sudo bash -c "$(alias pd); pd ./mytool --some params" sudo bash -c eval\ "$(alias pd)\; pd ./mytool --some params" sudo bash -c eval\ "'$(alias pd)\; pd ./mytool --some params'" I was hoping for a nice, concise way to ensure that my current pd alias was fully used (in case I need to tweak it later), though some of my attempts weren't concise at all. My last resort is to put it into a shell script and put that somewhere that sudo will be able to find. But aliases are soooo handy sometimes, so it is a last resort.

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• Build suggestion for mini itx server [on hold]

  - by Spyros

  I am looking to create a home server and since there does not seem to be a nice ready made one to purchase, i thought of building a mini itx one. I am not familiar with the best hardware/case to pick and therefore i thought i would ask for your experience. I will most probably install a simple linux distro, probably Debian and most probably without a desktop environment as well. Therefore, I am not looking for the best graphics card, though a decent one is preferred for sure. I would say that the most important thing is that the case/hardware play well with each other and the machine has decent specs ( i think something like 8gb RAM and 1TB hdd is most probably my most important things). I understand that this question can be closed as subjective, but it would be a great help for me if some of you guys who have been doing a similar build, can suggest something. I tried to find a stack exchange variant for the question, but it seems that this one more closely relates to the subject. But I will definitely understand it if people close it due to being subjective in nature. If you can maybe move it somewhere or so, please feel free to do so. Thank you for your time :)

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• How can I find out if a port is opened or not?

  - by Roman

  I have installed Apache server on my Windows 7 computer. I was able to display the default index.php by typing http://localhost/ in the address line of my browser. However, I am still unable to see this page by typing IP address of my computer (neither locally (from the same computer) no globally (from another computer connected to the Internet)). I was told that I need to open port 80. I did it (in a way described here) but it did not solve the problem. First of all I would like to check which ports are opened and which are not. For example I am not sure that my port 80 was closed before I tried to open. I am also not sure that it is opened after I tried to open it. I tried to run a very simple web server written in Python. For that I used port 81 and it worked! And I did not try to open the port 81. So, it was opened by default. So, if 81 is opened by default, why 80 is not? Or it is? ADDITIONAL INFORMATION: 1. In my httpd.conf file I have "Listen 80". 2. This site tells me that port 80 on my computer is opened. 3. I get different responses if I try http://myip:80 and http://myip:81. In the last case browser (Chrome) writes me that link is broken. In the first case I get: Forbidden You don't have permission to access / on this server. 4. IE writes that "The website declined to show this webpage".

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• recursive grep started at / hangs

  - by Martin

  I have used following grep search pattern on multiple platforms: grep -r -I -D skip 'string_to_match' / For example on FreeBSD 8.0, FreeBSD 6.4 and Debian 6.0(squeeze). Command does a recursive search starting from root directory, assumes that binary files do not have the 'string_to_match' and skips devices, sockets and named pipes. FreeBSD 8.0 and FreeBSD 6.4 use GNU grep version 2.5.1 and Debian 6.0 uses GNU grep version 2.6.3. On FreeBSD 6.4, last information printed to stderr was "grep: /dev/cuad0: Device busy". After this grep just idles as according to "top -m io -o total" the I/O usage of grep is nonexistent. Same behavior is true under FreeBSD 8.0, but last information sent to stderr is "grep: /tmp/.wine-0: Permission denied" on my installation. In case of Debian, last output to stderr is "grep: /proc/sysrq-trigger: Input/output error". If I check the I/O usage of grep process under Debian, it is following: root@Debian:~# iotop -bp 22439 Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 22439 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % grep -r -I -D skip 10.10.10.99 / Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 22439 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % grep -r -I -D skip 10.10.10.99 / Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 22439 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % grep -r -I -D skip 10.10.10.99 / ^Croot@Debian:~# What might cause this? Is there a way to view which file grep is currently processing in case lsof is not present? I'm able to use lsof under Debian and looks like the problematic file name there is "0xc6b2c230 file struct, ty=0, op=0xc0d34120". I'm not sure what this is.. I'm not able to use lsof or fstat under FreeBSD. PS: I know I could use find utility, but this is not the question.

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• Can I use a Windows Server 2003 Domain Controller but my home router for DNS?

  - by NetworkingWannabie

  Hi All Probably easiest to start with a description of my current setup, which works (oh, and this is a home setup not an office or anything): I have an ADSL modem with a static IP address (192.168.128.1), and its DHCP capability is disabled. I have a permanently powered up Windows Server 2003 machine with a fixed IP (192.168.128.2) which provides my domain controller, dhcp, and dns. The default gateway for everything is my ADSL modem everything is setup to use the WS2003 machine as the primary DNS with the ADSL modem as Secondary DNS just in case the server goes down (everything includes the server itself). Lastly, just in case it's relevant, I have my DHCP leases set to infinite (or whatever the right term is). Everything is pretty hunky dory. Except, that is, for the fact that my server is ALWAYS on, and it isn't always used, so I'm burning juice that I don't need to - my server burns around 120W which isn't immense but isn't irrelevant either, so I'd like to put it into a stand-by state when it isn't being used (the more standby the better) and then get the clients to wake it up. Am I correct in assuming that this won't work at the moment - A given client would need an IP address to wake the machine up, and it needs to machine to be awake to get an IP - catch 22? Assuming I'm correct, can I move to using my router (which is always on) for DHCP? What impact will this have on DC and DNS? Alternatively, does anyone have a better way for me to achieve this? Can I get the server to wake up when it sees clients look for a DHCP server, etc? Wow, that came out longer than expected! Thanks for your help.

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• New build won't boot: some fans turning, no beep or video

  - by Dave

  When my new system is powered up, the case fan and power supply fans turn fine. The CPU fan twitches, but never gets going. Although I've heard that with AMDs and Gigabyte motherboards that is not necessary a problem. Hard drive is spinning. However, there is absolutely no indication that anything else is happening. The motherboard, as far as I can tell, does not have an internal speaker, but I harvested one from another machine and plugged it in and still no beeps at all. The monitor screen stays black, on both the integrated VGA and DVI. This is a brand new build, and has never successfully booted. My parts are: AMD Athlon II X2 245 Regor 2.9GHz Socket AM3 65W Dual-Core Processor Model ADX245OCGQBOX - includes CPU cooler) GIGABYTE GA-MA785GPMT-UD2H AM3 AMD 785G HDMI Micro ATX AMD Motherboard - Retail G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL8D-4GBRM - Retail CORSAIR CMPSU-400CX 400W ATX12V V2.2 80 PLUS Certified Compatible with Core i7 Power Supply - Retail SAMSUNG Spinpoint F3 HD502HJ 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive COOLER MASTER Elite 341 RC-341C-KKN1-GP Black Steel MicroATX Mid Tower Computer Case - Retail I also have a DVD burner, but it acts the same whether that is plugged in or not. I'm using the on board video. What I've tried so far: I've switched power supplies, with no difference. I've tried different monitors (of which all are working on other machines) with no difference. I have tried putting it one memory module at a time, with no difference. I have tried the absolute minimum I can think of (power supply into motherboard, power button ONLY plugged into front panel, CPU fan plugged in), with no difference. I appreciate any ideas anyone might have. Do I need to RMA the motherboard? This is my first build, so there might be something obvious. I was very careful in assembly with static; I'm confident nothing was zapped during assembly.

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• Making one of the folders default in Apache

  - by OmerO

  Hello, The file & directory structure of my website is as follows: /Library/WebServer/mysite/joomla .. /Library/WebServer/mysite/wiki .. /Library/WebServer/mysite/forum .. /Library/WebServer/mysite/index.php As you see, there are various applications each residing in separate folders. Now, in order to define this structure, I have made this entry in Apache http-vhosts.config file: ServerName mysite.com DocumentRoot "/Library/WebServer/mysite" ** And I already have the DirectoryIndex defined: DirectoryIndex index.html index.php, and so on. So far so good but I want this specific functionality: When someone visits mysite, he/she should automatically directed to: /Library/WebServer/mysite/joomla (and therefore /Library/WebServer/mysite/joomla/index.php) I don't want to achieve that functionality by putting a redirection code inside /Library/WebServer/mysite/index.php or /Library/WebServer/mysite/index.htm because that causes time delays (because of the redirection, of course) But in this case, the only proper way of achieving it seems to set DocumentRoot this way: DocumentRoot "/Library/WebServer/mysite/joomla" But when I set it that way, then the other folders (/wiki, /forum, etc.) are simply not served by Apache. To work around it, I put directives like: Alias /wiki /Library/WebServer/mysite/wiki .. Alias /forum /library/WebServer/mysite/forum and it did work actually the way I wanted. But... I still cannot use it that way because in this case I just couldn't manage to make the wiki use Short URLs (as described in link text) So, I have to set the DocumentRoot back to /Library/WebServer/mysite and shoud be able to assign /Library/WebServer/mysite/joomla as the "default directory" (my own terminology :) Can I do it in Apache? Is there any other way you might suggest? Thanks.

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• Dovecot (on Mac OS X Server 3 - Mavericks) giving “Error: Failed to autocreate mailbox INBOX: Permission denied”

  - by user2965240

  I recently upgraded my server to Mavericks and I thought everything had gone perfectly. As it turns out, that was not exactly the case. After everything working fine for a week or so, I created a new user and my mail server flat out stopped working. Most frustratingly, there were no log errors (in any of the many mail logs) which shed any light on the cause. After much trial and error, I finally got my mail server functioning (partially) by reinstalling server and restoring the mail folder from the previous day's backup (yay for backups). However, as is often the case, there were MANY permission issues. After slogging through various permission problems, I believe that my system is now receiving mail, however none of my users can check it because every time someone attempts to login the server generates following error: Error: Failed to autocreate mailbox INBOX: Permission denied I would assume that this is yet another permissions problem, however after much searching, I still cannot resolve this. To be clear, I don't want Dovecot to autocreate any mailboxes at this point because all of the mailboxes should exist. Any help on this would be sooooooo greatly appreciated. P.S. On a side note: why is it that repairing permissions never takes care of difficult issues like these? That would be awfully helpful...

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• grep --color=auto with -i option disables the matching text color, why?

  - by emptyset

  I was messing around with grep and put this in my .zshenv: export GREP_OPTIONS="--color=auto" export GREP_COLORS='mt=1;34' I was bonking my head on the keyboard and changing GREP_COLORS around for a minute trying to figure out why the folder colors were working, but the matching text wasn't. I was doing this: $ grep -R -n -i -e "functionFoo\(" --include=*.cs --exclude-dir=Logs * The line number and file names were set with the default colors, but the matching text wasn't. After spending way too much time, I thought to do this: $ grep -R -n -e "functionFoo\(" --include=*.cs --exclude-dir=Logs * (I removed the -i option.) That's all it took to get the matching text to correctly show up in bold blue. This is a Cygwin on Vista setup, with rxvt running zsh. Any idea why grep colors would break on specifying a case-insensitive match? Update: Under cygwin 1.7, it's a little bit better - case insensitive search works correctly, but it only highlights the word that matches the expression exactly. In other words, "FunctionFoo" highlights "FunctionFoo" but not "functionFoo" and vice versa. Probably a grep issue so I'll be submitting it to that list.

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• Domain changes required for SSL integration

  - by user131003

  Currently my site supports regular payment options (User is taken to Payment Gateway/PG website). Now I'm trying to implement "seamless" PG integration. I need SSL for this. I'm having a dedicated server with 5 static IPs from Hostgator/HG. options: I take SSL for www.my_domain.com. According to HG, I need to change IP of main site as current IP is not really dedicated as it is being shared by cpanel etc. So They need to bind another dedicated IP to main domain for SSL to work. This would required DNS change for main website and hence cause few hours downtime (which is ok). I've noticed that most of the e-commerce websites are using subdomains like secure.my_domain.com for ssl/https. This sounds like a better approach. But I've got few doubts in this case: a) Would I need to re-register with existing PGs (Paypal, Google Checkout, Authorize.net) if I switch to subdomain? Re-registering is not an option for me. b) Would DNS change be required for www.my_domain.com in this case. This confusion arose because of following reply from HG : "If the sub domain secure.my_domain.com is added to an existing cPanel it will use the IP for that cPanel so as long as it is a Dedicated IP that will be fine. If secure.my_domain.com gets setup as its own cPanel it will need to be assigned to a Dedicated IP which would have a DNS change involved.". PLease suggest.

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• FWBuilder DNS Object Run Time - when exactly does it resolve the DNS name?

  - by Jakobud

  In Firewall Builder, when you use the DNS Object and set it to run time, when exactly does the firewall (iptables in our case) actually resolve the DNS name? Is it whenever a call is made to that DNS name in the firewall? So the firewall would resolve the name on the fly whenever someone/something tries to access that DNS name? Or is it when you execute the fw script to load the rules into iptables? So in this case, it would resolve the DNS name that one time and then hard-code the resulting ip address into the iptable rules? From what I read, I think its #1, but it's just not 100% clear to me. We have two servers for a certain function on our network. One is the primary server and one is backup. alpha0.domain.com alpha1.domain.com In DNS we have this: alpha.domain.com -> alpha0.domain.com If the primary server goes down and we need to switch to the backup, I just change our local DNS record to point to alpha1.domain.com instead. So back to the firewall, if I just put in a Domain Object as alpha.domain.com, do I have to reload the firewall rules every time we switch to the backup alpha server and change the DNS record? Or will the firewall automatically resolve to the correct address even after the switch?

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• Setting cfengine3 class based on command output

  - by gnomie

  This question is very similar to How can I use the output of a command in cfengine3 but the answer does not apply in my case I believe. I want to update a git repository via "git pull" and based on whether that lead to changes trigger some follow up action. Simplified, if there was something like "match output and set class" via some body if_output_matches I would want to use something like this: bundle agent updateRepo { commands: "/usr/bin/git pull" contain => setuidgiddir_sh("$(globals.user)","$(globals.group)","$(target)"), classes => if_output_matches("Already up-to-date.","no_update"); reports: no_update:: "nothing updated"; } body contain setuidgiddir_sh(owner,group,folder) { exec_owner => "$(owner)"; exec_group => "$(group)"; useshell => "true"; chdir => "$(folder)"; } So, is it possible to use the output of a - possibly expensive command - and base some decision on that? The execresult function is no good choice for me as a) the pull may become expensive at times (not recommended following the cfengine3 reference) and b) does not allow to specify user, group, working dir - which is important in my case. The repository is in user space and not owned by root.

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• Use of backreferences in fail2ban filters possible?

  - by Izzy

  From time to time, I see collections of suspect "File not found" errors in my Apache logs, basically using the pattern File does not exist: /var/www/file, referer: http://my.server.com/file In human terms: The file was not found, though it referenced here itself. A clear hacking attempt, as that's hardly possible (and the REQUEST_URIs often enough suggest the same). In my eyes a clear case for fail2ban – if I could get backreferences to work here: failregex = ^%(_apache_error_client)s File does not exist: /var/www(.+), referer: http://.+\1$ (Justin Case: above examples assume the DIRECTORY_ROOT of that webserver being /var/www) I googled for hours, searched the fail2ban wiki up and down – but nowhere I could find a statement concerning backreferences in its filters. Are they not supported, or did I do it the wrong way? Any hints how to make it work (except from "dirty hacks" like first sending the request to another fake url using mod-rewrite, and then catching on that (if anyone is interested, I can elaborate on that approach in an answer), or doing something similar using mod-security)? as an entire log line was requested: [Fri Nov 08 14:57:28 2013] [error] [client 50.67.234.213] File does not exist: /var/www/text/files.htm++++++++++++++++++++++++++Result:+using+proxy+27.34.142.47:9090;+no+post+sending+forms+are+found;, referer: http://www.myserver.com/text/files.htm++++++++++++++++++++++++++Result:+using+proxy+27.34.142.47:9090;+no+post+sending+forms+are+found; (sorry, logs were just switched, so this long candidate was the only one left currently; minor adjustments were made for privacy reasons)

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• Puppet : How to override / redefine outside child class (usecase and example detailled)

  - by alex8657

  The use case i try to illustrate is when to declare some item (eq mysqld service) with a default configuration that could be included on every node (class stripdown in the example, for basenode), and still be able to override this same item in some specific class (eg mysql::server), to be included by specific nodes (eg myserver.local) I illustrated this use case with the example below, where i want to disable mysql service on all nodes, but activate it on a specific node. But of course, Puppet parsing fails because the Service[mysql] is included twice. And of course, class mysql::server bears no relation to be a child of class stripdown Is there a way to override the Service["mysql"], or mark it as the main one, or whatever ? I was thinking about the virtual items and the realize function, but it only permits apply an item multiple times, not to redefine or override. # In stripdown.pp : class stripdown { service {"mysql": enable => "false", ensure => "stopped" } } # In mysql.pp : class mysql::server { service { mysqld: enable => true, ensure => running, hasrestart => true, hasstatus => true, path => "/etc/init.d/mysql", require => Package["mysql-server"], } } # Then nodes in nodes.pp : node basenode { include stripdown } node myserver.local inherits basenode { include mysql::server` # BOOM, fails here because of Service["mysql"] redefinition }

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• UPS power requirements for server

  - by captainentropy

  Greetings! So, I just placed an order for a new server. The company recommended that I get a 3000W UPS. (!) As best as I could I calculated the following wattage consumption based on benchmarked data or datasheets provided by the manufacturers of each component: number watts **total watts** MoBo 1 240 240 CPUs (E5540) 2 80 160 RAID cards (3ware) 2 18 36 RAM (6x4GB) 6 3 18 DVD drive 1 7 7 floppy 1 2 2 RE4 drives 8 7 56 WD20 drives 8 6 48 Intel X25 SSD 2 0.15 0.3 total = 567 So that is for the PSU requirements only. The PSUs in the machine are a 720W for the master node and 800W each for two subsystems. That's a total of 2320W that can be delivered by these PSUs. But that is 4X the amount being consumed, at most, by the components. I didn't count case fans or the eSATA card (3W maybe?) or what the PSUs themselves require but assuming I double or triple my calculations I'm not even remotely close to the 3000W UPS I was suggested to get. They run at least $1100. I could get a 2000W for about $750 or a 1500W for $450 and still be well over my estimated power need. I don't think I need a whole lot of run time in the case of a power outage, maybe 20 minutes max, enough time to shutdown if the power doesn't come on within 5-10 minutes. Any thoughts? Am I off on my calculations? Did I overlook something major? If so what are your suggestions for a UPS? Thanks!

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• Where is my problem? The P6X58D Premium Mobo, Windows 7, or other?

  - by Dylan Yaga

  I was having problems with my USB devices for an hour last night, and I am unable to determine the root cause of the problem. The two symptoms are: At seemingly random times (not consistently spaced by time or caused by any detectable event) my USB devices become "detached". Windows will play the USB disconnect sound and then the reconnect sound. The devices disconnected and then reconnected. My USB Keyboard will "stick" on one key for several seconds before processing any other keystroke made. The mouse also does not respond to clicks. I do not lose mouse movement or USB device connectivity. And after a moment of this several beeps will be emitted from the speakers. Hardware Specs: GFX Card: EVGA GeForce GTX 470 Superclocked 1280MB DDR5 PCIe Motherboard: ASUS P6X58D Premium Intel X58 Socket LGA1366 MB Processor: Intel Core i7-920 2.66Ghz 8M LGA1366 CPU Memory: Corsair Dominator 6144MB PC12800 DDR3 Storage: Hitachi 1TB Serial ATA HD 1600MHz 7200/32MB/SATA-3G Cooling: Corsair Hydro H50 CPU Liquid Cooler Case: Corsair Obsidian 800D Full Tower Case Power Supply: Corsair HX1000W 1000W Modular Power Supply Steps I have taken to narrow down the problem: Restarted the computer. - No change Changed USB port the Hub was connected to on the CPU. - No change Removed all devices from USB Hub and connected directly to CPU. - No change Used a different USB keyboard both in USB Hub and directly to CPU. - No change Disconnected and reconnected all cables. - No change Disassembled the Tower and determined if the USB headers were firmly connected. - No change Checked device manager for errors. Checked all USB devices. - Nothing flagged After an hour of frustration trying to narrow down the problem it appeared to disappear. But I am torn between it being a Mobo problem or an OS problem. Is there anything else I can do to narrow down the problem before a reformat and then eventually exchanging the Mobo?

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• Setting up a network where packets are traced

  - by Marcus

  My situation is the following: I have an internet connection, which is shared between people. More or less obviously, people is using it to download illegal stuff. Since I'm the owner of the connection, I want to avoid being sued. I don't want to prevent the people from doing the things they want, but I want to be legally safe. Now, I have relatively little competences in network administration, so I was wondering: is it possible to setup a network, where the source and destination of the packets are logged? I would use this to prove, in case of lawsuit, that the traffic was coming from a given machine. if the idea is feasible, is there any wireless router on which I can install linux, where I can install the packet sniffer? how much space could the logs take (containing only the timestamp/source/destination), per GB of traffic? a very rough estimation would be very helpful. if a machine on my network is sending bittorrent packets to a certain IP, would this log be able to reflect the time, source ip and destination ip? I assume that obviously the torrent data would be encrypted and un-decryptable. Am I missing something? Is there a better strategy? Any pointer to documentation would be helpful as well - in that case, I would use this as starting point.

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• Windows 7 comments field missing when browsing network

  - by Toymangenie

  I have just purchased three Windows 7 Professional Dell 64-bit PCs for testing prior to upgrading our company’s 120+ PCs from Windows XP Professional. The setup is a standard domain with a Windows Server 2003 32-bit server. We name each PC XP1 to XP150 so that when users join or leave, I don’t have to rename the PC. We use the Description field to allocate the user’s name to each PC. We also have a share set up on each PC using the user’s name. When I browse the network using Windows Explorer in XP, I get a useful display. The left pane showing the PC number and the right pane showing NAME and COMMENTS So, for example I would see: XP01 Fred Bloggs (Each PC on a new row.) The right pane is my main tool for administering the network. I can easily see the PC number and the name of the user. However, in Windows 7, this seems to have been thrown out of the window and replaced with fields that I do not need and in my case always display the same info. "Name", "Category", "Workgroup", "Network Location" In my case the Name column gives the PC number (XP10) etc and all three other columns display identical useless information. So I can’t see who is using XP10. When I am in “help desk” mode, I would naturally ask the user’s name and use my remote desktop client to view their screen. The user isn’t aware of their PC name, so I am finding it impossible to match the user name with a PC number. Any ideas how to overcome this "by design" change to Windows 7?

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• How to reinstall Windows 7 Embedded?

  - by Joshua Lim

  I need to reinstall Windows 7 Embedded on my server but I'm not able to do so despite repeated tries. I tried booting up the server with the Windows Embedded 7 Setup ISO attached (using IPMI) and I've also tried running setup.exe in the CDROM after Windows has booted up. Both methods fail. In the first case, the server simply reboots by itself after I selected "IBW" button. In the second case, the installer returns some files missing while installing. I'm sure my Windows Embedded 7 Setup ISO is correct, because earlier on, I used IBW on the same ISO to install Windows Embedded 7 onto the server. Of course, the C drive has empty when I first installed. What should I do? I read that the normal Windows 7 (not embedded version) installer allows you to reformat the C drive before re installing. There does not appear to be such an option for Windows embedded. Appreciate any tip. Thanks.

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• Is it possible for a faulty processor to cause audio static/noise?

  - by Tom

  I have a Core 2 Extreme processor I received from a friend and have set up an XBMC box using it. However, I constantly get audio static whenever playing any music or videos. Here is a video of the sound: http://www.youtube.com/watch?v=SqKQkxYRVA4 I have tried replacing everything short of the case and the processor, including cables, audio interfaces, operating systems, ram, etc, leading me to think it might be either the case shorting out the motherboards I have tried or a faulty processor. Is it possible for a faulty processor to cause audio static/noise? Any feedback would be appreciated. Edit - Here's a list of things I have tried: Reinstalling OS Installing/upgrading/repairing PulseAudio/Alsa Installing alternate OSes, straight Ubuntu, Lubuntu, Xubuntu, Arch, Mint, Windows 7 Switching audio from the external card to internal Optical, audio out through HDMI, audio out through headphones Different ports on receiver (my main desktop sounds fine on the same sound system) Different optical cables Unplugging everything unnecessary from the motherboard (1 HD, 1 Stick of Ram, 1 Keyboard) Swapping out ram Swapping out the motherboard Replacing the Graphics Card (was replaced due to fan being noisy, not specifically for this problem) Different harddrives Swapping power supply Disabling onboard audio Switching Power Cable Plugging in through surge protector Plugging into different outlet on separate circuit

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• TCP Server Memory management: #Connections Vs. #Requests

  - by Andrew

  Given that, there is no theoretical limit to number of concurrent TCP connections a Windows 2008 server can handle. Only thing will happen is, with each connection there will be memory consumption in server. Unfortunately, memory is not unlimited (and I want to utilize only physical memory). For example, lets say we've 2GB server memory. Now there are two extreme cases: Case 1: If we've allocated 64KB buffer for each connection (only to receive incoming request), then 32768 connections can consume all the 2GB of memory. This will not leave any memory to queue/process incoming requests from those connections. Case 2: On the other hand, lets say a single (or very few) connections continuously keeps sending request buffers (for example, video streaming from one connection to other) and server cannot process them within time, those buffers will get piled up in server and eventually will occupy most of the servers memory. And it will not leave any memory for new connection thereafter. This is the real dilemma in server design bugging me badly for last many days. If I can decide on max size of request buffer per connection and max number of requests to allow in queue per connection. Then, based on available server memory, it will then automatically set limit on max number of concurrent connections. How to decide on these limits to achieve best performance and throughput? I am just looking for perfect utilization of server resources. Are there any standard guidelines or empirical data available with someone who can share with me please.

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