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• How do you synchronise huge sparse files (VM disk images) between machines?

  - by chrisdew

  Is there a command, such as rsync, which can synchronise huge, sparse, files from one linux server to another? It is very important that the destination file remains sparse. It may be longer (but not bigger) than the drive which contains it. Only changed blocks should be sent across the wire. I have tried rsync, but got no joy. groups.google.com/group/mailing.unix.rsync/browse_thread/thread/94f39271980513d3 If I write a programme to do this, am I just reinventing the wheel? http://www.finalcog.com/synchronise-block-devices Thanks, Chris.

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• Cannot resolve a single A Record from client machine

  - by Alex

  I set up a simple Bind server on my VPS and it is working properly. The problem occurs with my local windows machines, which are connected to internet through the home router. I created an A-record named 'dev' and it is invisible from my local network for some reason, though people from other locations can resolve dev.mydomain.com. Ironically, dev.mydomain.com cannot be resolved for myself only. If I add another A-record, say, 'gamma' then it becomes visible from my local windows machines instantly. So this is just for that particular 'dev' name. The only difference is that I had dev.mydomain.com server on another IP but that was a month ago; all nameservers have been changed since then. I tried to reboot my router and flushed dns cache on windows machines: no result. Thank you in advance.

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• Preventing - Large Number of Failed Login Attempts from IP

  - by Silver89

  I'm running a CentOS 6.3 server and currently receive emails entitled "Large Number of Failed Login Attempts from IP" from my server every 15 minutes or so. Surely with the below configured it should mean only the person using the (my static ip) should be able to even try and log in? If that's the case where are these remote unknown users trying to log into which is generating these emails? Current Security Steps: root login is only allowed without-password StrictModes yes SSH password login is disabled - PasswordAuthentication no SSH public keys are used SSH port has been changed to a number greater than 40k cPHulk is configured and running Logins limited to specific ip address cPanel and WHM limited to my static ip only hosts.allow sshd: (my static ip) vsftpd: (my static ip) whostmgrd: (my static ip) hosts.deny ALL : ALL

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• Can irssi ignore the 24h dsl-reconnect

  - by mcnesium

  A couple of weeks ago I had to switch my ISP from cable to DSL. Now I have this ridiculous disconnect and reconnect every 24h. It's no big deal insofar as having a new IP address every day, but for one exception. Since I host my irssi screen on a machine inside the LAN, my history gets affected by the reconnect in terms of a topic announcement, the users in each channel, creation date and so on. It's about 10 lines of redundant content every day. This is annoying especially in channels with very little traffic, because you hardly see the actual content in line with the every-day-junk. So I was wondering if I can tell irssi to silently ignore the reconnection details, so that my only meta-content in each channel goes back to "Day changed to ...", like back in the days of cable-internet.

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• Deactivate SYN flooding mechanism

  - by mlaug

  I am running a server that is running a service on port 59380. There are more than 1000 machines out there connecting to that service. Once I need to restart the service all those machines are connecting at the same time. That made some trouble as I have seen that log entry in kern.log TCP: Possible SYN flooding on port 59380. *Sending cookies*. Check SNMP counters. So I changed sysctl net.ipv4.tcp_syncookies to 0 because the endpoints to not handle tcp syn cookies correctly. Finally I restarted my network to get the changes in production Next time I had to restart the service, the following message was logged TCP: Possible SYN flooding on port 59380. *Dropping request*. Check SNMP counters. How can I prevent the system for doing such actions? All necessary counter measures are done by iptables...

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• Change Apache DocumentDirectory path in trueCrypt partition

  - by Alan C

  Hello, I'm recently moving from windows to linux, so I've setup my machine to dual boot Windows7 and Ubuntu 10.04. I was able to successfully setup Apache on the Ubuntu partition, but I need to move the DocumentRoot since my websites are on a TrueCrypt partition that is in another hard drive so I can have them accessible in both OS. I followed some guides on how to change the path for the DocumentRoot so I end up modifiying the default file at /etc/apache2/sites-available DocumentRoot /media/truecrypt1/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /media/truecrypt1/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> Those are the lines that I've changed, but now when I go to localhost I always get the Forbidden You don't have permission to access / on this server. Apache/2.2.14 (Ubuntu) Server at localhost Port 80

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• Outlook is trying to retrieve data from Microsoft Exchange

  - by Adrian Baker

  Some of my users on my network keep getting a pop up message saying "Outlook is trying to retrieve data from Microsoft Exchange". Microsoft Office 2003 is installed on these computers and when this message appears it freezes every users outlook. I have read some articles, and they say it a problem with 2002 and 2003 version of outlook. So I have changed some users Office to MS Office 2007 but still I have the same problem. This is become a big problem as it is happening often and users are getting annoyed. If anyone can give me some advise on how to solve this problem and what could be causing this problem I would be most grateful.

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• how to set up domain name, bad request invalid hostname

  - by user45645

  assume i have a domain name which will be forwarded to my public ip (web server) automatically. in IIS 6, ip is public ip port is 6666, advanced - host value is www.hello.com firewall is open for 6666(web server port) and 53(DNS port), DMZ of router is my physical address in DNS, i have already had a zone called oldhello.com. And i expect a new domain name. So i have addded a new zone called hello.com and checked SOA server (P) is one.hello.local. then added a new host called one, full name is one.hello.com, ip address 192.168.7.3(my address in router) and then add a alias(CNAME) www, full name is www.hello.com, FQDN i choose the host i added before (one.hello.com) i expected that when i type the public ip in browser, can it be changed to domain name automatically. if not set host value www.hello.com, use public ip i can see the web however, after set up host value www.hello.com, browser show bad request invalid hostname

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• best way to record local modifications to an application's configuration files

  - by Menelaos Perdikeas

  I often install applications in Linux which don't come in package form but rather one just downloads a tarball, unpacks it, and runs the app out of the exploded folder. To adjust the application to my environment I need to modify the default configuration files, perhaps add an odd script of my own and I would like to have a way to record all these modifications automatically so I can apply them to another environment. Clearly, the modifications can not be reproduced verbatim as things like IP addresses or username need to change from system to system; still an exhaustive record to what was changed and added would be useful. My solution is to use a pattern involving git. Basically after I explode the tarball I do a git init and an initial commit and then I can save to a file the output of git diff and a cat of all files appearing as new in the git status -s. But I am sure there are more efficient ways. ???

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• ASUS P5B Plus motherboard - no any drives found - how to restore RAID array?

  - by Moha

  We have a small server machine with an ASUS P5B Plus motherboard and 4 SATA HDDs. The HDDs were configured in a RAID10 array. Up until now, everything worked fine, but now the system doesn't recognize the drives. BIOS is set to RAID, jMicron controller is set to RAID, yet I can't see any of the drives in the BIOS setup, and jMicron BIOS tells me "no any drives found" The HDDs all spin up, I hear no clicking sounds or anything that would suggest HDD error. I did a search on this problem and replaced the SATA cables as suggested, but nothing's changed. What I have in mind is checking the CMOS battery and resetting the BIOS to use IDE mode, but I don't know if it will ruin the RAID system on the HDDs. It is not a critical server and there's only one database running on it (which I have backup of), but I don't want to setup the server from scratch if not necessary. What should I try to restore the RAID array and put the server back to working order?

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• Fonts and encoding in windows live mail.

  - by Looser

  Sometimes I have non-english emails (arabic for example). When I try to open them with windows live mail, it doesn't show them correctly.. for example such this: &1588;&1603;&1585;&1575; &1610;&1575;&1605;&1575;&1606; (I changed it a bit to show here as I want) I had a look at options, there was encoding on arabic(windows) but I didn't find anything else. When I open this mail on yahoo however, there is no problem. What can I do?

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• Any examples of a complex, changeable system modelled with a spreadsheet?

  - by andygrunt

  When I asked this question using games as the example (hoping it would be more likely to have been done), it was closed as being off topic so let me ask it this way... Has anyone used a spreadsheet to model a complex, changeable system (something like crowd behaviour, weather systems, a closed ecology, evolution or whatever) and if so, can you point me at it? I'm hoping for a normal (albeit complex) spreadsheet using the spready's inbuilt formulae and functions rather than something specially coded. I'm also after something where it's possible to change the variables and see the changed outcome - perhaps the variables change using random numbers or the like.

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• Windows 7 RDP Problem - connecting to external zone with computer names

  - by alex

  I recently installed Windows 7, all is well so far, apart from using RDP to access computers outside my domain. We use a datacenter, outside of our domain. I was using Windows Vista before (not sure if this is relevant) - I could RDP no problem to the machines (using their machine names - Web10 for example) I have changed my IP address to be the same as it was when i was using vista We use a draytek firewall - we use DMZ Host to map my IP to an external ip- which is allowed to access the datacenter I've disabled windows firewall When i try to connect in Remote Desktop client, using Web10, I can't connect, however, if I enter the actual IP address, i can. I have run out of ideas... any help is appreciated!

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• Session cach and tmp folder error on cPanel Centos

  - by Danialzo

  One of my clients has come across multiple breakdowns in their websites with the following error PHP Code: Warning: session_start() [function.session-start]:open(/tmp/sess_1d6616afe1b8a0d91a8d9ec29254b453, O_RDWR) failed: No space left on device (28) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/index.php on line 177Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/currency.php on line 45&#65279;Notice: Error: Can't create/write to file '/tmp/#sql_4c5_0.MYI' (Errcode: 28) Error No: 1 They are experiencing this problem while: Nothing has been recently changed on the server tmp and other folders are occupied with not more than 10% of their total space The error come and goes I would really appreciate it if anyone could guide me through. Thanks in advance

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• Thinkpad laptop heats up more than it used to - what are my options?

  - by jdelage

  Hi, I have a 3 yr old laptop (Thinkpad T61) which runs seemingly much hotter than it used to. It's not uncomfortable to touch, but I wonder whether I should do something about it. It does get uncomfortable if I have it on my lap (which I rarely need to do). I haven't made any mods to the laptop other than a bigger HD, and I recently cleaned up the inside (superficially - I didn't remove the fan). Are fans items that should be changed regularly? Edit: I use the laptop plugged in 90%+ of the time. Thanks, JDelage PS: I know that a 3-yr old laptop is old tech, but this one works perfectly so....

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• Options not available anymore in my Samsung 932bw lcd

  - by Sávio Mendes

  I think a friend messed up something in my monitor. I left him playing a game and when i came back, i noticed that the brightness was very high. I tried to change it but i couldn't, brithness, contrast, color warm and a few other options are marked as "not available" (he probably adjusted the brightness and changed something else too, that it's causing this thing). I updated the monitor driver, the vcard driver, plugged the monitor in other pc (I'm connected through dvi, but in the other pc i plugged through rgb) but nothing fixed it. Is there someway to force reset all the options or something like that to fix this? (I'm running Win7 RC1 but I don't think that it has something to do with it, it was working perfectly until he messed it up, and the other pc where I plugged it, runs winxp and the problem occurs too. And it doens't look like a the monitor is broken, it works like it always did, just these options are marked "not available" now...)

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• A dot between two numbers is converted to comma

  - by Isaac

  For example when i want to write 1.1 in MS Word, the . is suddenly converted to ',' when i write the second 1. Here is a illustration of what happens: Notes: I am typing in Arabic and i want the numbers Arabic. When I am typing in English it is fined and everything is better than expected: The . remains . I tried to reset Word settings based on the all the ways that MSDN suggests. Now all the styles and options are set to default and all add-ons are removed. I also tried to reset my Regional and Languages settings to a Standard one. I have also changed all the , separators to . How can i stop the Word from changing my dots to commas? (It only happens when dot is between two digits)

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• Cannot read/write a second drive in MBP 13

  - by Carlos

  I changed my original HDD for a SDD earlier this year and I just got one more SSD for my MBP 13 (2012) that I used to replace DVD drive. I'm using Mountain Lion. The SSD looks to be recognized allright, but I can't format it. Then I removed the main drive and tried the new one as the main drive and did the boot using a USB drive with MAC OS and everyhing worked as it should (like I just had one drive). However when I bring the first drive back together with the second they both show up but I can't use it. Seems like I have no permission, but when I look at it's properties it says I can read and write to it. Any ideas? Thanks a lot!

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• Windows screen resolution change: lengthen timeout

  - by Jonathan J

  Occasionally I need to change the screen resolution of the console of a Windows virtual machine using XenCenter. When you attempt this change, Windows will revert if you don't accept the changed resolution within 15 seconds of clicking 'apply.' (Normally, this is a good thing.) The problem is that if I have a slow connection between XenCenter and the Xen hypervisor, the virtual console display may not refresh quickly enough to allow me to respond within 15 seconds. As a result, I can't change the resolution, even though the new resolution is valid. Is there a way to increase the timeout before reverting to the original display resolution?

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• Data recovery after user profile corruption on Windows XP

  - by m68z8mi

  I'm away from home for college, and my computer back home has been having some issues. My dad took it to a computer store, and apparently the user profiles somehow got corrupted, so they're locked out of the computer. This is a Windows XP box, but I changed the default administrator account password, so that backdoor isn't a possibility. Now, that computer's HDD has a whole bunch of data on it which my dad would hate to lose, so I suggested that they take the HDD out, plug it into some other computer, and just copy all the data off that way (keeping in mind that the data itself wasn't encrypted). However, the computer store people said that wouldn't be possible unless they had the administrator account password (which I can't remember for the life of me), and that they'd either have to reformat and reinstall Windows, or else use some complicated sounding recovery process costing a decent amount of money. That sounds like complete BS to me, but I'm not 100% sure about it, so I thought I'd get some more opinions. Could someone more knowledgeable about this stuff suggest a good course of action to take?

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• When I plug an HDMI cable into my MacBook Pro with Retina Display, the resolution of the retina display changes

  - by Tyler Crompton

  I had an HDMI cable plugged in for a while that connected to a TV with no power. The retina display randomly flashed blue after a while and then changed to a different resolution (possibly 1080p). I unplugged the HDMI cable and nothing happened. So I restarted the computer to no avail. I was still having issues. So I fiddle with some settings after plugging in the HDMI cable again. Now, the retina display appears fine when no HDMI cable is plugged in, but when there is one plugged in, the resolution changes. I have mirroring turned off (which is what I want). The resolution of the retina display when an HDMI cable is plugged in is 3,360px x 2,100px (according to the size of a screenshot) and the external display is 1,600px is 900px. How can I fix the retina display to show with the correct resolution.

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• What's the best tool to use to automatically backup selected folders from Windows to my external hard drive?

  - by PhD

  I have a 1TB external hard drive and I'd like to periodically schedule backups of my "Libraries" in Windows to the external drive. I'd prefer if it could detect what files have changed and periodically transfer them to the drive instead of I having to do it manually. Is there a way in Windows 7 to do this automatically? If not, what are some external tools (preferably free) that I can use for this? EDIT: I've used Windows back-up and I find it restrictive for detecting changes and backing up automatically. That's all that I'm aware of. My WD hard drive had something for this but the application doesn't work any more and it wasn't that good either. So, I wish to know what are my options.

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• Mac OS X: Change $PATH from within python script

  - by Eye of Hell

  I have a bunch of python scripts. One of them installs software (subversion) that requires it's path to be added to $PATH. After it is installed, I want the next script to use the software. If I run export PATH=/opt/subversion/bin:$PATH in bash between the first and second script, all is ok. But if I add os.system( 'export PATH=/opt/subversion/bin:$PATH' ) as the last command of the first script (that installs subversion), $PATH remains unaltered after it exits. Is it any way to change $PATH from within python script so it will remain changed after the script finishes (inside single bash session, of course, I know about /etc/profile).

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• Share files - Ubuntu 12.4 and Windows 7 - one network - password not accepted

  - by gotqn

  I have three machines - two with windows 7 and one with Ubuntu 12.4 version. There are in the same network connected by modem. The two machines shares file with no problem, but they can not see the machine with Ubuntu. On the other hand, I am able to see the share files of the windows machines from the Ubuntu's Network. When I select a folder, it wants the network password - I changed it several times in order to be sure that I am entering the correct one but in every case it says that the password is wrong. I have read some topics about files sharing between Linux and windows in which it is said that I should use samba, but is there a more easy way to do this, using the build it options?

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• Logging on to server creates duplicate user profiles in Documents & Setting

  - by Tech

  Windows Server 2003. I am having a problem with the creation of new user profiles when logging in remotely to a terminal server. The new user profile gets added under Documents & Settings as username.domainname. Deleting the new profile does not allow the original profile to be reverted to. Went logging on to the server again, it creates another new user profile. Nothing was changed in the Active Directory or security settings. How do I get the original profile to be used?

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