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• Replication keeps popping up on SharePoint databases

  - by Ddono25

  My typical discovery scenario: We receive an alert that the transaction log is growing quickly. We are in Simple Recovery so I go to check it out. Log is already sized to 100GB and is at 80% capacity. I run the "Whats using my log files" script from SQL Server Central and see that Replication is enabled on the database. We do not set up replication, and I don't think Replication can be done on SharePoint content db's as Replication is not supported (requires PK on all tables). This has been occurring on random servers (about 5 so far, all within the past three weeks) and it only occurs on Content Databases. sp_removedbreplication does not always work in removing the Replication either. We have found that we need to run the sp_removedbreplication, change all db owners to SA and reset Recovery Mode to Simple to completely eradicate any vestiges of this bug. How would Replication be enabling itself? We have never set up Replication on these servers. There is no evidence of any type of Replication other than the 'log_reuse_wait_desc' from the DMV query and log growth. Any help on this ghost would be appreciated!

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• Process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process sending out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response [INFO] Mon Jan 10 16:31:47 2011 Blocked outgoing ICMP packet (ICMP type 3) from 192.168.1.189 to 212.25.57.90 Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome.

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• Testing for disk write

  - by Montecristo

  I'm writing an application for storing lots of images (size <5MB) on an ext3 filesystem, this is what I have for now. After some searching here on serverfault I have decided for a structure of directories like this: 000/000/000000001.jpg ... 236/519/236519107.jpg This structure will allow me to save up to 1'000'000'000 images as I'll store a max of 1'000 images in each leaf. I've created it, from a theoretical point of view seems ok to me (though I've no experience on this), but I want to find out what will happen when there will be directories full of files in there. A question about creating this structure: is it better to create it all in one go (takes approx 50 minutes on my pc) or should I create directories as they are needed? From a developer point of view I think the first option is better (no extra waiting time for the user), but from a sysadmin point of view, is this ok? I've thought I could do as if the filesystem is already under the running application, I'll make a script that will save images as fast as it can, monitoring things as follows: how much time does it take for an image to be saved when there is no or little space used? how does this change when the space starts to be used up? how much time does it take for an image to be read from a random leaf? Does this change a lot when there are lots of files? Does launching this command sync; echo 3 | sudo tee /proc/sys/vm/drop_caches has any sense at all? Is this the only thing I have to do to have a clean start if I want to start over again with my tests? Do you have any suggestions or corrections?

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• Why is my biometric logon method no longer default and how to fix it? Win 7-based lenovo laptop

  - by StormRyder

  My laptop has been having some random problems with hibernating properly. That is a whole another topic that I still haven't resolved, but this is a different issue. The issues are connected, I guess, because one time after my computer experienced a failed hibernate, my login screen changed: since then my login screen always appears as the standard one with a prompt to type in a password. I can still use the finger scanner by clicking "other credentials" button. But that's annoying having to do that every time; previously the prompt to use finger scanner was the default one, whereas the typing password access was the alternate. How do I bring this arrangement back? In other words, how to switch the default from the type password prompt to the finger scan prompt? From online searches, I have only found discussions of turning the biometric access on or off... but clearly it is turned on and working, since I can use it. It's just not the default for some reason...

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• Excel 2007 pivot table does not aggregate properly

  - by Patrick

  I am using a an excel pivot table to summarize some data and just found a problem. The problem deals with how aggregate values are calculated. Let's say I have a table of data with three columns: Name, Date, Value. If I create a table where Name and then Date are used as Row Labels and Value is the aggregate value, ie Average. The pivot table will look something like this: +John .3450 5/14/2010 1.234 5/15/2010 3.450 5/16/2010 -3.25 What I think should be happening here is that the values for each date are averaged and then those values are averaged to come up with the value in the same row as the Name, John. But that is not what it does. It takes the average for each date, which it shows across from the date, but then instead of taking the average of those numbers, it actually uses the raw data and computes the average for all of John's values. It should show the average of the daily averages to correspond with the tree hierarchy, but instead just shows me the average for all of John's values. It essential will only aggregate at one level, but visually creates sub levels that it is not using. Does anyone know how to change this or understand by what logic this makes sense? Why would I create any sub groupings if I cannot compute aggregates on them?

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• Tracking down the cause of a web service fault running in IIS

  - by BG100

  I have built a web service in Visual Studio 2008, and deployed it on IIS 7 running on Windows Server 2008 R2. It has been extensively tested, handles all errors gracefully and logs any uncaught errors to a file using log4net. The system normally runs perfectly, but occasionally (2 or 3 times a day) a fault occurs and screws up the application which needs an iisreset to get it working again. When the fault occurs I get some random errors that are caught by my catch-all error log, such as: Value cannot be null. Could not convert from type 'System.Boolean' to type 'System.DateTime'. Sequence contains no elements These errors are raised on every request until I manually do an iisreset, but there is no sight of them when the system is running normally. The web service is a stateless request-response application. Nothing is stored in the session. It could be load related, but I doubt it as there are only around 30 or 40 requests per minute. This is proving very tricky to track down. I can't work out what is putting IIS into this bad state, and why it needs an iisreset to get it working again. Nothing is reported in the event log. Can anyone suggest how to enable more extensive logging that might catch this fault? Also, does anyone know what might be causing the problem?

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• Nexus One WiFi connection problems.

  - by sunocky

  I have two new Nexus One for a research project. For the projects I need to keep a server running on the phone. But soon I found out that both the phones have inconsistent WiFi connection problems at my home. It can connect to my WiFi network, but will drop off in a random time. And in order to reconnect to my WiFi, I may need to reboot my router, or the phone will say "obtaining IP address" and then "Unsuccessful". I also own a G1 with firmware version 1.6, it has no such connection problems. Well, to my surprise, the two Nexus One works fine with connecting to the WiFi network at my work place, which is a WEP type WiFi connection. By the way, it is a WPA type connection at my home. Anyone knows what's the problems with the Nexus One? Any suggestions on what should I do if I want to keep the WiFi connection live all the time at my home? Thanks very much!

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• Apache 2.2 + mod_fcgid + PHP 5.4: (104) Connection reset by peer

  - by Michele Piccirillo

  On a Debian 6 VPS, I'm running PHP 5.4 via mod_fcgid on a couple of different virtual hosts, managed by Virtualmin GPL. At random, I get 500 Internal Server Errors; restarting Apache brings everything back to normality. Examining the logs, I find messages of this kind: [Thu Oct 04 15:39:35 2012] [warn] [client 173.252.100.117] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server [Thu Oct 04 15:39:35 2012] [error] [client 173.252.100.117] Premature end of script headers: index.php Any ideas about what is happening? UPDATE: I found a similar question and the author reported to have solved the problem disabling APC. I tried following the advice, but I'm still getting the same errors. VirtualHost configuration SuexecUserGroup "#1000" "#1000" ServerName example.com DocumentRoot /home/example/public_html ScriptAlias /cgi-bin/ /home/example/cgi-bin/ DirectoryIndex index.html index.htm index.php index.php4 index.php5 <Directory /home/example/public_html> Options -Indexes +IncludesNOEXEC +FollowSymLinks +ExecCGI allow from all AllowOverride All AddHandler fcgid-script .php AddHandler fcgid-script .php5 FCGIWrapper /home/example/fcgi-bin/php5.fcgi .php FCGIWrapper /home/example/fcgi-bin/php5.fcgi .php5 </Directory> <Directory /home/example/cgi-bin> allow from all </Directory> RemoveHandler .php RemoveHandler .php5 IPCCommTimeout 61 FcgidMaxRequestLen 1073741824 php5.fcgi #!/bin/bash PHPRC=$PWD/../etc/php5 export PHPRC umask 022 export PHP_FCGI_CHILDREN PHP_FCGI_MAX_REQUESTS=99999 export PHP_FCGI_MAX_REQUESTS SCRIPT_FILENAME=$PATH_TRANSLATED export SCRIPT_FILENAME exec /usr/bin/php5-cgi Package versions webmin-virtual-server/virtualmin-universal 3.94.gpl-2 apache2/squeeze 2.2.16-6+squeeze8 libapache2-mod-fcgid/squeeze 1:2.3.6-1+squeeze1 php5 5.4.7-1~dotdeb.0 php5-apc 5.4.7-1~dotdeb.0

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• Why do fonts sometimes look "fat" on Mac OS X?

  - by jtimberman

  Sometimes when resuming from suspend, the fonts in Mac OS X look "fatter" than normal. Unfortunately right now I can't get my Macbook Pro to exhibit the "normal" behavior for comparison, it has been abnormal yesterday and today. If I can get screenshots of what I think is 'normal', I'll add them. "Fixing" this has been random. I use an external monitor, and sometimes unplugging it and plugging back in, or even turning it off and back on has worked. Sometimes with the display attached (or not) detecting displays works. Sometimes logging out or rebooting entirely is what it takes. Displays used: Macbook Pro 15" built-in display Dell 27" LCD (2009 model) Software where I see this happen, at least most noticably: Firefox (screenshots below) iTerm Things MacIrssi (screenshots below) I am using Mac OS X 10.5.8. "Abnormal" view from MacIrssi with Inconsolata 16 pt. image full size "Abnormal" view from Firefox. Finally got it to switch back, though after resuming from suspend its back to "fat" :-(. image full size And 'normal' in Firefox:

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• Is there a way to avoid Wacom Control Panel to stop showing in certain cases?

  - by S.gfx

  This is the problem: Suddenly, you double click on desktop Wacom tablet settings icon, and it won't show the dialog. It appears to be loaded as it's shown down in the Windows taskbar. I suspect it is caused by change of resolution or some setting, maybe suddenly it sets the origin of the panel dialog at some 3000 pixels to the right or something. I have dug in the wacom_tablet.dat file to see if I can fix it changing some value there, but it looks like a log, a history, more than a ini for settings. And anyway does not solve it. My solution is having always a very complete settings file done and backed up to restore (with Wacom utility for this, which in previous driver versions did not exist) when this happens, but it is counter-productive: You change the settings even per each project (and software) needs. I have seen it happenning with Cintiq 12", intuos4 A6, Graphires, Intuos 1. Is it just me, doing something weird every time? I doubt it, it's normal use, I am amazed that it seems no one else has had this problem (or nobody asked). It happens often with typical use. Maybe it's because I'm setting a shortcut in the desktop? Weird as it works perfect until some random moment. (I have dug in Wacom's forums and FAQs, then here, but nothing related to it. Neither in "related questions".) The thing happens in Win XP, 7, etc. It's done so for years in my experience, and several times at work, which is worse.

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• SSH freeze when UFW is enabled

  - by Cristian Vrabie

  I have a small Ubuntu 10.10 server and i recently noticed a weird behavior (not sure if it was happening before). If I have ufw enabled (with default deny all in, allow all out, allow all http, allow all on a random port i use for ssh) when i perform some actions in a ssh sesion, the ssh console completely freezes. The server continues to work and if i close the console i can start another ssh session. This happens no matter from where I log in (tried from another ubuntu and a mac). The actions are fairly reproducible, for example vim some config files (though vim-ing other files works), cat some other file, etc. The freeze never happens if ufw is disabled. Any idea what's going on? Thanks! Cristian Addition: if you're wondering, yes, I have TcpKeepAlive on yes and I doubt is related (it would happen with ufw disabled too) As requested: my ufw conf below. Also, i don't know if it has something to do but the server has 2 ips. On one is configured the ssh domain, and on one to serve hhtp (via apache2) Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ------ ---- 19922/tcp ALLOW IN Anywhere 9418/tcp ALLOW IN Anywhere 80/tcp ALLOW IN Anywhere 443/tcp ALLOW IN Anywhere

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• Can I get all active directory passwords in clear text using reversible encryption?

  - by christian123

  EDIT: Can anybody actually answer the question? Thanks, I don't need no audit trail, I WILL know all the passwords and users can't change them and I will continue to do so. This is not for hacking! We recently migrated away from a old and rusty Linux/Samba domain to an active directory. We had a custom little interface to manage accounts there. It always stored the passwords of all users and all service accounts in cleartext in a secure location (Of course, many of you will certainly not think of this a being secure, but without real exploits nobody could read that) and disabled password changing on the samba domain controller. In addition, no user can ever select his own passwords, we create them using pwgen. We don't change them every 40 days or so, but only every 2 years to reward employees for really learning them and NOT writing them down. We need the passwords to e.g. go into user accounts and modify settings that are too complicated for group policies or to help users. These might certainly be controversial policies, but I want to continue them on AD. Now I save new accounts and their PWGEN-generated (pwgen creates nice sounding random words with nice amounts of vowels, consonants and numbers) manually into the old text-file that the old scripts used to maintain automatically. How can I get this functionality back in AD? I see that there is "reversible encryption" in AD accounts, probably for challenge response authentication systems that need the cleartext password stored on the server. Is there a script that displays all these passwords? That would be great. (Again: I trust my DC not to be compromised.) Or can I have a plugin into AD users&computers that gets a notification of every new password and stores it into a file? On clients that is possible with GINA-dlls, they can get notified about passwords and get the cleartext.

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• Some process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process send out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response [INFO] Mon Jan 10 16:31:47 2011 Blocked outgoing ICMP packet (ICMP type 3) from 192.168.1.189 to 212.25.57.90 Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome. Thanks in advance

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• Some process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process send out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome. Thanks in advance

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• How is a subdomain passed to the webserver?

  - by Joshua Frank

  I know that dns resolves an address like example.com to an IP address like 11.22.33.44, but I'm a little confused about how subdomains are resolved, so that when you type http://subdomain.example.com, what actually gets passed to the server at 11.22.33.44? In other words, example.com = 11.22.33.44, but subdomain.example.com/path = ??? Are "subdomain" and "path" passed as http headers, or mapped in the url in some way, or what? Thanks in advance. Edit: If I'm understanding correctly, BloodPhilia says that subdomain.example.com actually is a different domain that in principle could resolve to a totally different IP. But if that's so, then what about hosts that have huge numbers of (what look like) subdomains, but which actually map to some path on the site. For instance, blogspot hosts millions of blogs, and they all look like this: aaa.blogspot.com bbb.blogspot.com ...millions more... yyy.blogspot.com zzz.blogspot.com Those are clearly not subdomains with their own IP's, but rather some mapping like aaa.blogspot.com -- www.blogspot.com/aaa, but how is this accomplished? What actually gets passed to the web server at blogspot.com?

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• Hosting django backend for iPhone / Android app

  - by Ashok Fernandez

  I am looking to make an iPhone / Android app for my university using the Appcelerator Titanium framework. The app will rely heavily on a server backend which will pull information from other sites, figuring out what is relevant to the user then deliver the content. Some of the information is individual to the user (calendar data), other bits are updates frequently but are shared (bus timetables) and others are static and the same for everyone (magazine articles). I was going to use django as I am fairly proficent in python so I thought it would save time. My question is, which hosting services do you recommend to host the server backend? I am expecting about 9000 people to use the app with very random spikes in traffic, but unfortunately I have very little to go on at this stage. I have heard a lot about Webfaction, is it suitable for something like this or am I likely to need something bigger? I don't really want to fork out for a VPS at this stage. What about Amazons EC2? Would that be more suitable than Webfaction? Sorry for the fairly open ended question, Im sort of new to this so I open to all suggestions.

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• Desktop PC does not power up on power button

  - by hIpPy

  When I press the power button on my desktop, it does not power up completely. Before I press the power button, I see lights on the motherboard. Everything is normal. On power button press, the fans on the cpu, graphics card and motherboard start to spin a little for a second or two and then they stop. No beeps during this process. It has been doing this for a while now but it used to start up after some trials. Once it starts up, I have NO issues at all like random shutdowns so it is not an issue with OS. I'm just guessing here but it seems as if the PSU (Antec TP2-550ATX) is dying out and does not have enough power now - just a guess. It's an old desktop assembled in 2005 but I have maintained it well. Any ideas? Please help. Thanks. Below is the complete configuration. DFI LAN-Party UT NF4 Ultra-D 6/23 {6.70}, Evercool EC-VC-RE 41/47C, AMD Opteron 170 2.0GHz {1.3.2.16} 1.312V 36/41C, ThermalRight SI-120, Panaflo 120×38mm OCZ Platinum 2×1GB 200MHz 2.66V 3-3-2-7 1T XFX 7800GTX 256MB 475/1250MHz {91.31}, Zalman VF900 Cu led 41/56C WD Caviar 320GB 7200RPM 16MB SATA 3Gb/s Antec TP2-550ATX Antec P180 WinXP sp2 KB896256 Logitech MX310 Razer Mantis Speed BenQ FP91G+ 19" LCD 8ms DVI Creative Audigy2 ZS {4.42} BenQ DW1640 Logitech z-5300e 5.1 280W Legend: Driver versions: {} User settings: [] Voltage: V Wattage: W Temperature: C (Celsius) min/max

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• GNU Screen and Finch Not Playing Nicely

  - by Sean M

  I use finch for instant messaging, and for persistence, finch is one of the things that runs in my screen session. There are three main computers that I access my screen session from, and each works at a different screen resolution. Because of the different resolutions, when I switch computers, I use screen -rd to attach to my screen session. Using screen -x results in problems. When I attach to the session, though, finch experiences display problems. I have to wait up to several minutes for finch to become responsive - it doesn't redraw properly at all. Trying to switch between chats just writes ^n and ^p, or ^(1-9) for numbers. It fixes itself after some time. Using ctrl-l does not help. Switching back and forth between screen windows does not help. This is an annoying behavior that I don't experience with any other applications running in screen. Is this a bug in screen or finch, and if not, what can I change about my configuration to correct it ? (would appreciate it if "finch" could be used as a tag for this instead of or in addition to "pidgin")

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• picking a linux compatable motherboard

  - by Chris

  Last time I bought a new computer (I build them myself) I got a motherboard that had really poor linux support for a long time. Specifically the audio. I had to wait months before the kernel supported the on board audio chipset. That is exactly the situation I'm trying to avoid this time around. I have some specific questions about "server motherboards" actually. I looked at a few models of server motherboards by intel, and some random models on newegg. I wasn't able to see much of a difference from regular desktop motherboard other than most had two sockets, and support for much more ram. These boards seem more popular with Linux users. Why? AMD and Intel both have server CPUs as well. Some question, what's the difference? To make this question more concrete, I was looking at this this motherboard. The main questions about it that I can't answer are: Can I get a motherboard without on board raid and audio? I wanted to get a hardware raid controller and a PCI audio card. I thought a server motherboard would be cheaper and not have these "extras", since who wants an audio card on a server? Where can I found out about Linux support for the components on this board? "Intel ICH10R", "Realtek ALC889", "Marvell 88E8056" I'm buying this computer to work as a Linux desktop for a lot of compiling, coding and audio/video work, but I don't want to rule out the possibility of installing windows and playing some games at one point. (even if the last game I got has been sitting in its box unopened for almost a year). Is it a good idea to buy a "server motherboard" and play games on it, or are desktop boards better value for this? The ultimate solution for me would be a motherboard that had GPL divers for onboard LAN, a single CPU socket, lots of PCI express and PCI. USB 3.0, and no fancy hard disk controllers since I'll be getting a separate one.

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• rc scripts dependencies

  - by chris

  On a Ubuntu 10.04.1 LTS server install certain services fail to start properly after a reboot. I have a couple of virtual interfaces defined on eth0: /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 172.16.5.240 netmask 255.255.255.0 gateway 172.16.5.1 auto eth0:1 iface eth0:1 inet static address 172.16.5.241 netmask 255.255.255.0 gateway 172.16.5.1 auto eth0:2 iface eth0:2 inet static address 172.16.5.242 netmask 255.255.255.0 gateway 172.16.5.1 auto eth0:3 iface eth0:3 inet static address 172.16.5.243 netmask 255.255.255.0 gateway 172.16.5.1 and so on... The services that try to bind to for example 172.16.5.243 fail during boot, complaining that there is no such IP address. My questions: 1) Are the services started parallel by default? Can I disable that so they run sequentially? 2) Is there a way to define dependencies between rc scripts? I'm only familiar with the defining the order of seqentially started scripts using the numbers in /etc/rc[0-6].d/) Any other fix or workaround appreciated.

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• load average in top and procs in vmstat

  - by Mingfei.hua

  As far as I know, the load average in top is the numbers of precess(threads) in running or uninterrupted sleep status, So it should be equal to (procs-r +1 )+ procs-b in vmstat, but in practice, this two number always have big gap. Any wrongs in my understanding, appreciate so much if some guys give me some guide. top - 05:34:50 up 1 day, 20:56, 5 users, load average: 2.83, 2.67, 1.62 Tasks: 79 total, 1 running, 78 sleeping, 0 stopped, 0 zombie Cpu(s): 6.8%us, 1.8%sy, 0.0%ni, 91.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.4%st Mem: 1758000k total, 582636k used, 1175364k free, 103932k buffers Swap: 917500k total, 0k used, 917500k free, 180868k cached procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 1182524 103784 180860 0 0 1 9 6 53 7 2 91 0 0 0 0 0 1182524 103784 180860 0 0 0 36 70 117 0 0 100 0 0 0 0 0 1182516 103784 180860 0 0 0 0 73 132 0 1 100 0 0 0 0 0 1182516 103784 180860 0 0 0 0 60 127 0 0 100 0 0 1 0 0 1182516 103784 180860 0 0 0 0 62 102 0 0 100 0 0 0 0 0 1182628 103784 180860 0 0 0 0 289 238 1 2 97 0 0 2 0 0 1152160 103784 180892 0 0 0 8 1481 2371 54 12 34 0 0 1 0 0 1182192 103784 180860 0 0 0 0 681 834 19 4 78 0 0 0 0 0 1182200 103784 180860 0 0 0 0 80 147 0 1 100 0 0 0 0 0 1182200 103784 180860 0 0 0 0 53 107 0 0 100 0 0 0 0 0 1182208 103788 180856 0 0 0 72 64 123 0 0 100 1 0

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• Unexplained cache RAM drops on Linux machine

  - by FunkyChicken

  I run a CentOS 5.7 64 machine with 24gb ram and running kernel 2.6.18-274.12.1.el5. This machine runs only Nginx, php-fpm and Xcache as extra applications. Since about 3 weeks my memory behavior on this machine has changed and I cannot explain why. There are no crons running which flush anything like this. There are also no large numbers of files being deleted/changed during these drops. The 'cached' memory gets dropped about every few hours, but it's never a set gap between flushes, this indicates to me that some bottleneck gets reached instead. It also always seems to be when total memory usages gets to about 18GB, but again, not always exactly 18GB. This is a graph of my memory usage: As you can see in the graph the 'buffers' always stay more or less the same, it is mainly the 'cache' that gets dropped. Running vmstat -m I have outputted the memory usage just before and just after a memory drop. The output is here: http://pastebin.com/diff.php?i=hJqZqztm 'old version' being before, 'new version' being after a drop. About 3 weeks ago my server crashed during a heavy DDOS attack, after I rebooted the machine this odd behavior started. I have checked a bunch of logs, restarted the machine again, and cannot find any indication what changed. During these 'cache' memory drops, my iNode usage drops at the same time. Does anyone have any idea what might be causing this behavior? Clearly my RAM isn't full, so I am curious why this could be happening.

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• .htaccess redirect to error page if port is not 80

  - by Momo

  I'm running a portable server through usb stick. The thing is I also have WAMP installed in my local machine and Apache somehow gets started on windows startup, because of some random reason which I don't recall now and it can't be changed. I want to prepare my portable server in situations like this, so closing httpd.exe from process and starting my portable server is not an option. Anyway, because of already active httpd.exe my portable server's WordPress site can only be accessed through localhost:81 - this is a problem as WP site is very dependent on the URL and I don't want to include the url with port on WP database. Here is what I want to do through .htaccess: On any path except for error.php file check if not port 80 If not port 80 redirect to /error.php?code=port It it possible for it to have priority over WP redirection or URL handling? In the error.php I provided info on how to manually close httpd.exe and such so my family and friends can access the portable site. It's sort of like a gallery and calender application for events and other such stuff... Please help? I'm I can't figure it out at all. I know others may not have apache already running, but I want to prepare for such a situation. Something like the following, but the following doesn't work. # BEGIN WordPress <IfModule mod_rewrite.c> <If "%{SERVER_PORT} = 80"> RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </If> <Else> RewriteEngine On RewriteRule ^(error.php)($|/) - [L] RewriteRule ^(.*)$ /error.php?code=port [L] </Else> </IfModule> # END WordPress By the way, the portable server Server2Go automatically generates vhosts based o the hostname set on it's config file and changes ports if the port (e.g. 80) is already open.

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• I receive email not addressed to me - virus?

  - by Anne

  Every once in a while I receive email (on Gmail) that isn't addressed to me. Gmail puts it in the spam box, because it 'can't verify that it has been sent by [sender]'. The emails, when opened, contain confidential information about deliveries and paid bills (it does look an awful lot like 'real' mail from well-known companies, and it doesn't look like a scam, since the mail is informative - they give information instead of asking for credit card numbers ;-)), and I even got an email from "Facebook" that I requested a password change and that I have to 'click here' to change the password for [email address that isn't mine]. I am not the only addressee, there seems to be a whole list of Gmail addresses beginning with 'a'. The original addressee obviously has some sort of virus, and now I wonder if this could be a risk for me too. Is my email being sent around without my knowing too? I am not the kind of person who randomly clicks on shady links - I am very careful on the internet - but maybe there are other ways of catching viruses? Is there something I should do/check? Thank you for your help!

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• WEP/WPA/WPA2 and wifi sniffing

  - by jcea

  Hi, I know that WEP traffic can be "sniffed" by any user of the WIFI. I know that WPA/WPA2 traffic is encrypted using a different link key for each user, so they can't sniff traffic... unless they capture the initial handshake. If you are using a PSK (preshared key) schema, then you recover the link key trivially from this initial handshake. If you don't know the PSK, you can capture the handshake and try to crack the PSK by bruteforce offline. Is my understanding correct so far?. I know that WPA2 has AES mode and can use "secure" tokens like X.509 certificates and such, and it is said to be secure against sniffing because capturing the handshake doesn't help you. So, is WPA2+AES secure (so far) against sniffing, and how it actually works?. That is, how is the (random) link key negociated?. When using X.509 certificates or a (private and personal) passphrase. Do WPA/WPA2 have other sniffer-secure modes beside WPA2+AES? How is broadcast traffic managed to be received by all the WIFI users, if each has a different link key?. Thanks in advance! :).

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