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• Server suddenly running out of entropy

  - by Creshal

  Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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• What is the effect on LVM snapshot size when a file block is rewritten with it's original contents?

  - by NevilleDNZ

  I'm exploring using LVM snapshot's to off site incremental archives from a snapshot "master" file system. In essence: simply copy across only the files on the "master" that have changed since the last incremental copy to the "archive". Then snapshot the "archive" to retain the incremental. I am a bit puzzled as to the block usage behaviour of the archive's own incremental snapshot. I'm expecting that LVM is not smart enough to know that the "file block" is actually unchanged, and the a new copy will be allocated and written for the fresh "archive" file system. Can anyone confirm this, or point me to a document/page that gives some hints? BTW: the OS hard disk cache, hard disk physical cache and hard disk itself also doesn't need to do any actual "disk writes" as the "disk block" likewise is unnecessary. Any pointers to discussion of this style of optimisation would also be ineresting.

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• Windows 7 Windows Explorer jumpy tree view

  - by P a u l

  Is there any way to get Windows Explorer tree view in Windows 7 to stop jumping? I think they really messed up this design. Click a node to expand a deeper level and it instantly scrolls the tree vertically to a new location. This is not a good feature since my eye completely loses the node it was focused on and I have to hunt for where I was. I want the tree view to remain fixed where it is unless I scroll it myself.

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• Wireless dropouts that only affect subset of devices

  - by jwaddell

  When watching videos streamed over WiFi from a NAS box (D-Link DNS-323) I am getting wireless dropouts. However they only appear to occur when I have left my laptop (Dell Inspiron 9300 running Windows XP SP3) running; the laptop is usually suspended if I'm not using it. The dropouts have occurred when streaming to a Netgear EVA8000 streaming device, and also to a PS3. I'm using a Netgear DG834G as the wireless modem/router. When a dropout occurs I go to the laptop and see that its wireless connection has also dropped out. The odd thing is that my wife's MacBook and my iPhone still maintain their connections. What could be causing this behaviour, and how do I go about fixing it?

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• Chrome: automatically redirect me to highest ranking search result, like Firefox does

  - by Siim K

  How to emulate the Firefox (I'm using v3.6) address bar search redirection in Google Chrome? For example, if I type... imdb moon ...to the address bar and press Return in Firefox then it redirects me straight to http://www.imdb.com/title/tt1182345/ (and I've not visited the page before) When I try this is Chrome then I just get the google search page http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=imdb+moon So seems like Firefox redirects automatically to the highest ranking search result URL - is there a setting or add-on for Chrome to achieve the same behaviour?

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• Throttling apache downloads selectively

  - by Synchro

  I have a linux box running Debian Sarge (old I know) and apache 2.0.54. It serves two kinds of files - regular web pages and small images, and a lot of large podcast mp3s. The podcast downloads swamp the connection and make the rest of the site unresponsive, so I'm looking to throttle the data transfer rate (not the request rate) of just the podcasts. I've set up haproxy using this technique which does what it says it will, but solves a different problem - even only 5 simultaneous podcast downloads is enough to saturate the link. In a perfect world, haproxy would support per-connection throttling, but it doesn't. So far I've looked at mod_bw (won't compile for me, seems unsupported), mod_cband (unsupported, widely reported as problematic) and iptables using tc. The iptables approach would allow me to throttle things, but would not be at all selective, slowing down everything on the server, not just the podcasts, so would just move the bottleneck without changing overall behaviour. Ideas?

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• Upon clicking on a file, excel opens but not the file itself

  - by william

  Platform: Windows XP SP2, Excel 2007 Problem description: Upon clicking on a file in Windows Explorer (file is either .xls or .xlsx) Excel 2007 opens, but does not open the file itself. I need either to click on a file again in Windows Explorer or open it manually with File/Open ... from Excel. Does anyone know what could cause this rather strange behaviour ? The old versions of Excel worked "normally" ... i.e. upon clicking on a file, an Excel would open along with the file. Please, help !

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• servers connected to a poweredge 6248 receive traffic for their 'neighbours'

  - by Hannes

  In the network we have a few vlans but at the moment I was investigating vlan2 which carries the most traffic. When tcpdumping on the eth0.2 interface, I see a lot of packets arriving which are not addressed to, nor coming from the server. I checked this on several servers in the network and they all have the same issues. In short, our switches don't switch the traffic but threat it like they are a hub. Can you tell me what settings on the dell poweredge 6248 should prevent this behaviour?

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• Questions about Wordpress 3.0 RC

  - by Nimbuz

  I'm looking to upgrade my blog from Wordpress 2.5 to 3.0 RC, but I'm not sure if: List item It is stable? It will support existing v2.5 plugins? It will support my custom themes? Or do I have to design them from scratch for 3.0? Many thanks for your help!

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• Is there an FTP client for Windows 7 with a text-based UI? (not text-prompt based, like ftp.exe)

  - by Alan B

  Is there such as thing as a text-mode FTP client for Windows 7 ? By 'text-mode' I mean one that runs in a CMD.EXE window as opposed to a Windows GUI application. It also needs to be something along the lines of FileZilla, i.e. menu-driven as opposed to command-entry clients like NcFTP or indeed the built-in one. edit: To avoid confusion, what I mean is an application similar to that pictured (ZTreeWin File Manager), which runs from CMD.EXE and uses text characters for its UI, within the CMD.EXE window. The built-in FTP client, and things like NcFTP offer a prompt at which you issue commands. That's not what I'm looking for.

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• Laptop screen turns off on removing power cord

  - by YatharthROCK

  After a recent upgrade to Windows 8.1 Pro from W8, my laptop's screen turns off as soon as you remove the power cord. It turns back on with no issues when you plug the power back in. Keyboard and mouse input is processed while the screen is off. My settings tell the screen to go off after 2 minutes of inactivity on battery. I was having a battery issue from before where my laptop would should down after 5 minutes of running on battery (despite showing 60% left), but I think that's unrelated. Any other info will be provided on request. Can anyone help me figure out what's going on? How can I stop this behaviour?

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• Text template or tool for documentation of computer configurations

  - by mjustin

  I regularly write and update technical documentation which will be used to set up a new virtual machine, or to have a lookup for system dependencies in networks with around 20-50 (server-side) computers. At the moment I use OpenOffice Writer with text tables, and create one document per intranet domain. To improve this documentation, I would like to collect some examples to identify areas where my documents can be improved, regarding general structure and content, to make it easy to read and use not only for me but also for technical staff, helpdesk etc. Are there simple text templates (for example for OpenOffice Writer) or tools (maybe database-driven) for structured documentation of a computer configuration? Such a template / tool should provide required and optional configuration sections, like 'operating system', 'installed services', 'mapped network drives', 'scheduled tasks', 'remote servers', 'logon user account', 'firewall settings', 'hard disk size' ... It is not so much low-level hardware docs but more infrastructure / integration information in these documents (no BIOS settings, MAC addresses).

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• Printing documents on HP printer very slow

  - by maxim

  I have a strange problem with HP drivers. I have configured a HP printer 2025dn with LAN connection, on 3 pc, using the cd rom of HP driver. All works well, but sometimes for certain documents the time for printing is very slow and long. I observe during this situation, in task manager, a process called rundll32.exe loads CPU at 100%. If I kill that process the printer starts printing fast the document in the queue. I wondering the reason of this strange behaviour.

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• Clicking on Dock icon does not bring window on top (OS X Lion)

  - by Andrey Fedoseev

  I am using OS X Lion and I have a very annoying problem with windows not showing up when I click on Dock icons. It happens when I have some windows opened in one space but I am viewing another space at the moment. For example, I have Mail and Skype on space #2 but I am on space #1. Note that all windows are not minimized. I want to quickly switch to Mail. So I click on Mail icon in Dock, it switches the space to #2, menubar shows that active window is Mail but Mail window is actually below Skype window. The strangest thing is that sometimes it works as expected showing the Mail on top. I can't see any logic here, it's absolutely unpredictable, thus annoying. Does anyone experienced such problems? I wonder if it's a bug or correct behaviour. Is there any way to fix that?

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• Any experience with SATA SAS Interposer Cards?

  - by korkman

  Driven by the current price difference between SATA and SAS disks on one side and the potentially bad behaviour of SATA disks in bigger storage arrays on the other side, I have found so-called SATA-to-SAS interposer cards. Advertised as "seamlessly adding SAS capabilities to existing SATA disk drives", I wonder if anyone here has had some experience with these or similar products. The major benefits I can identify are the increased cable voltage (if all drives are SAS connected), the ability to power-cycle the drive and multipath (if desired). Obviously the SATA drive will still have to be RAID edition. The question is: Do these cards indeed increase the overall reliability of a storage system, or will failing SATA disks cause trouble nevertheless? Edit: I'm not asking for hypothetical answers, only actual experience please. I'm well aware that the typical 10k SAS drive is more reliable (and better performing) than 7200 SATA drives. But how does a nearline SAS, which is phyiscally the same disk as its SATA counterpart, compare to the SATA version with interposer?

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• Why does Pages.app connect to a server through https and keep the connection open?

  - by ggustafsson

  Every time i start up the program Pages (iWork) it connects to a server through https. What is going on? Why would Apple do this? I use no features under Pages that could warrant this behaviour. It connects to IP address 2.22.240.224 on port 443 and keeps the connection open until i close the application. All the info i can get from Wireshark is a bunch of Apple-related domain names. Edit: The same thing happens with Numbers. I have disabled "Documents & Data" on iCloud so that shouldn't be the reason why. Edit 2: The programs in the iWork suite stopped doing this after recent updates so it's not an issue anymore.

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• how to create a simple radio station [on hold]

  - by John

  I've been digging around for ages but not getting very far so any links or tips would be massively appreciated. I want to create a central "radio station" in my home to stream one playlist to any computers pointing their browser to the ip within my internal network. I have an old mini slave mac mini running ubuntu and was originally thinking I could get php and apache to handle this but then quickly realised that of course, php will serve out streaming independently per connection ie no radio station. Are there any servers already built for this sort of behaviour? is shoutcast one of the only versions Thanks, John

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• Yahoo toolbar and local sites (e.g. Intranet)

  - by Klaptrap

  We have local sites running on IIS in regular MS Windows network. User base has IE, FireFox and Chrome. Local sites are isolated by host headers and DNS record created for the common IP accordingly. This is a regular set-up. Users without Yahoo Toolbar type http://intranet and the sites resolves. Users with Yahoo toolbar type http://intranet and the toolbar goes off to search for this site in public domain. This is irrespective to whether the address is typed into the browser address bar or the toolbar. All versions of toolbar and IE are affected. I cannot see a setting on the toolbar to switch this "irritating" behaviour off and simply un-installing the toolbar is not an option. Any ideas?

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• Findstr not finding file when searching by extension

  - by feiht thief

  I am experiencing some odd behaviour when using findstr to search a collection of .php files. Depending on how I specify the file list, the file is not being found, even though it contains the string in question. These two files contain the string "personemail": Content.php and People.php A) Works as expected (finds personemail in Content.php and People.php) findstr /i /s /c:"personemail" * B) Fails (finds only in Content.php) - expected to find in Content.php and People.php findstr /i /s /c:"personemail" *.php C) Works as expected (finds in People.php): findstr /i /s /c:"personemail" p*.php What is going on?

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• XCache permission issue

  - by Guilhem Soulas

  I successfully installed XCache on a Linux server where WHM/cPanel is installed too. However when I go to the admin interface it shows me only the cache for the owner of the folder (= a cPanel account). So I copied the admin interface on another cPanel account of the same server and I'm surprised about the memory allocation because it seems to use the memory I set in php.ini for EACH user. So if set the memory size to 64M and I have 10 users, doesn't it mean that XCache can take up to 640M? It's not the behaviour I want because I can't control the memory in that case! I would like to set 64M only for the entire server.

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• Lightweight tool for viewing raw HTTP messages?

  - by rewbs

  Hi, I'm investigating differences in behaviour between a couple of Web servers. I need to see raw response data from the servers (i.e. before the response is de-chunked if it has "Transfer-Encoding:chunked" and before it is decompressed if it has "Content-Encoding:gzip"). I can find plenty of simple HTTP client that nearly do what I need (e.g. Poster, RESTClient), but they tend to decode the response one step too far. Network analysers like Wireshark give me what I need but are a bit heavyweight. Telnet is my best bet so far, but is a bit too simplistic (actions like capturing data or entering requests are a bit laborious). Can anyone recommend a good, lightweight tool for sending / viewing the raw data that constitute HTTP messages? Edit: I should add that I'm on Windows. Also, the tool would need to work both with remote and local servers.

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• Windows share mounted then symlinked on LAMP server. Serves up html, but not images.

  - by Samuurai

  This has really got me befuddled... I've mounted a share, like this: //srv1/UserUploads /mount/UserUploads cifs rw,user,exec,uid=wwwrun,gid=www,username=shareuser,password=sharepw 0 0 I then have a symlink here: WEBSVR:/Web/htdocs/public_html # ls -l useruploads lrwxrwxrwx 1 wwwrun www 18 Dec 7 09:18 useruploads -> /mount/UserUploads Oddly, if I ls inside the mounted area, items appear with a capital S -rwxrwSrwx 1 wwwrun www 4077 Dec 30 14:54 prop9.jpg -rwxrwSrwx 1 wwwrun www 4 Jan 12 15:57 test.html And if I bring up test.html in a browser, it works fine, but if I go to prop9.jpg, chrome gives me this error: This web page is not available. The web page at http://10.1.64.100/useruploads/webteam/help2let/prop6-1.jpg might be temporarily down or it may have moved permanently to a new web address. More information on this error Below is the original error message Error 100 (net::ERR_CONNECTION_CLOSED): Unknown error. Has anyone seen this behaviour where the binary files (images) arent displayed, but html/text is?

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• Why does the task pictogram flashes instead of opening the program?

  - by fredley

  Sometimes, when I select a click a program on the Windows 7 taskbar it won't appear (it doesn't gain focus and remains behind other open windows), and the icon will flash and turn orange. This happens reasonably frequently, and I've had it happen on two separate Windows installs on different machines. It just happened now and the only programs I have with active windows are Chrome, WMP and Explorer (2). It happened when I clicked Explorer. Once this has happened to one window, it affects all windows, and the only way I can switch between programs is by finding the window manually or using Windows+Tab. The only way I've come across to get the computer to snap out of this annoying behaviour is to restart the machine. Is there a way of stopping it? Edit Here's a video of it happening: http://www.youtube.com/watch?v=P12OxKK0kM4

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• My windows keyboard is being "clever" with the quote keys - how can I stop it?

  - by Marcin

  I'm using windows 7 on a laptop. On the laptop keyboard, for some reason, the quote key (which has both double and single quote on it) is doing some "clever" annoying things: When I press single-quote (or double-quote), windows doesn't send any characters until I press it twice (resulting in '' or "") When I press it before a vowel, I get some kind of accented character. As I usually only write English, this is annoying. The backtick/tilde key is subject to similar behaviour. I have not attempted to set up my computer to process anything other than English. My keyboard appears to be (in so far as these things are standard on laptops) a standard US qwerty keyboard. How can I stop this happening?

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• Check the disk for problems on Debian Lenny

  - by Equ

  Hi guys! I just bought a VPS hosting with Debian Lenny (I'm new to all this world). I've managed to install and setup everthing I need pretty well. My testing website works fast as expected most of the time, but sometimes it is really slow (response time is about 5-10 seconds). I checked everything and seems that there are may be some disk issues. How can I check the disk for problems/performance? What else could possible cause such a behaviour? Thank you!

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