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• Windows Server 2008: Limit UDP/TCP packets per IP or ban

  - by WBAR

  How I can limit UDP/TCP packets per IP send to my host (or better PORT) per second or minute ? Would be nice to ban that IP for 12/24 hours or even for ever. I got Windows Server 2008 and I'm very poor in Windows administration but quite good in Linux. EDIT: By basic problem is that They sending a lot of rubbish UPD and TCP packets.. TCP packets without SYNCH, fragmented UDP packets so my servers stop responding.. So I need to cut off users (IPs) sending more than X packets per second. I need solution witch provides me, somehow, configurable: X packets of certain type (UDP, TCP or both - lets say parameter named Z ) are allowed to be received by IP on Y port, otherwise this packet should be DROPPED. My virtual hosts are hosted by VirtualBox and I'm able to forward all incoming packets certain type and certain port to the specific Virtual Host, but I need to DROP them before my VirtualBox receive them.

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• linux migration/N high cpu consumption

  - by Alexander

  on my linux appliance based on 3.0.0-14 kernel I got: RPN:/tmp# ps axuf | grep migration root 6 92.9 0.0 0 0 ? S Apr23 2788:33 \_ [migration/0] root 7 99.7 0.0 0 0 ? S Apr23 2993:20 \_ [migration/1] my top is RPN:/tmp# top -b -n1 top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73 Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers Swap: 0k total, 0k used, 0k free, 183168k cached My question: why processes "migration/N" take so much CPU?

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• apache not starting in vagrant vm

  - by jimmyjambles

  I used Puphpet.com to create a Vagrant VM to be used for web development. The problem I am having is that the VM cannot start apache on boot. $ sudo /etc/init.d/apache2 start * Starting web server apache2 * * The apache2 configtest failed. Output of config test was: apache2: Syntax error on line 36 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/authz_default.load: Cannot load /usr/lib/apache2/modules/mod_authz_default.so into server: /usr/lib/apache2/modules/mod_authz_default.so: cannot open shared object file: No such file or directory Action 'configtest' failed. The Apache error log may have more information. the system is ubuntu 12, not sure what modifications I have to make to the puppet config to fix the problem.

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• What is the specific advantage of a blade server for virtualisation?

  - by ChrisZZ

  We are planning to implement a VDI Solution. We had some discussions about Blade vs Rack. As we are only planning to implement 75-100 Clients, we calculated, that we would need 2 Servers with Dual 8C Processors - and a shared storage server. This calculation is based on a paper by ORACLE, that says, 12 active virtual machines per core. Now, for buying to servers, a blade does not scale financially. But the Blade has some other advantages: a) The interconnectivity between the blades is super-fast. b) IO Virtualisation Are there other advantages, that we should consider, that would make up for price - and are this advantages so important, that we should think about investing in the blade?

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• ioncube not load after upgrading to php 5.4

  - by amir

  i am afraid that i broke somthing in my vps :/ i hope you can help me. i am on ubuntu-12.04-x86. and i moved to new vps so i tryied to upgrade the php to the news version from 5.3 to 5.4. anyway after installing i get this messages: fild loading /usr/lib/php5/20090626+lfs/ioncube_loader_lin_5.3.so /usr/php5/20090625+lfs/ioncube_loader_lin_5.3.so: undefined synbol: php_body_wri php 5.4.8-1~presise+1 (cli) (built(oct 29 2012) i need to mention that the server is working and php also working but when i do phpinfo there is no "with the ionCube PHP Loader v4.0.14, Copyright (c) 2002-2011, by ionCube Ltd." which was before :/ i installed with this guide:http://www.upubuntu.com/2012/03/how-to-upgrade-install-php-540-under.html i need to worry?

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• Source of Unexplained Requests in Server Logs

  - by Synetech inc.

  Hi, I am baffled by some entries in my server logs, specifically the web-server logs. Other than normal, expected traffic, I have noticed three types of request errors (eg 404, etc.): Broken links, ie links from old, external pages that point to pages that are no longer here Sequences of probes, ie some jerk trying to hack in by scanning my server for a series of exploitable admin type pages and such What appear to be completely random requests for things that have never existed on the server or even have anything to do with the server, and appear by themselves (ie not a series of requests like the probes) Could it somehow be a mistyped URL or IP? That’s about the only thing that I can think of, but still, how could I get a request on say, foobar.dyndns.org (12.34.56.78) for something like www.wantsfly.com/prx2.php or /MNG/LIVE or http://ant.dsabuse.com/abc.php?auth=45V456b09m&strPassword=X%5BMTR__CBZ%40VA&nLoginId=43. (Those are a few actual requests from my logs.) Can someone please explain scenario three to me? Thanks.

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• Installed Java 7, but terminal still shows Java 6

  - by chipbk10

  I've installed Java 7 on my Mac (10.7.5), but in the terminal there is still java 6. java version "1.6.0_37" Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909) Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode) There will be no problem with the version 6 on terminal, if I always got that errors when I tried to install a java application (LatexDraw): : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 The problem is related to instability of java 6 inferred from this link I've read this installed-java-7-on-mac-osx-but-terminal-is-still-using-version-6 and also try to change my Java version by using export JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home", but in my folder /System/Library/Frameworks/JavaVM.framework/Versions, there is no version 1.7, only versions under 1.6 ??? So, how can I fix this issue?

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• What hash should be used to ensure file integrity?

  - by Corey Ogburn

  It's no secret that large files offered up for download often are coupled with their MD5 or SHA-1 hash so that after you download you can verify the file's integrity. Are these still the best algorithms to use for this? Obviously these are very popular hashes that potential downloaders would have easy access to. Ignoring that factor, what hashes have the best properties for being used for this? For example, bcrypt would be horrible for this. It's designed to be slow. That would suck to use on your 7.4 GB dual layer OS ISO you just downloaded when a 12 letter password might take up to a second with the right parameters.

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• What settings to use for fastest reloading of a MySQL backup?

  - by Alex R

  I have a MySQL database which dumps to a 3.5 GB backup (mysqldump) in about 10 minutes. But reloading this backup on a standby / test server takes upwards of 12 hours. What are some settings that would maximize reloading performance? The most promising appear to be innodb_buffer_pool_size, innodb_additional_mem_pool_size, and innodb_log_buffer_size... but I'm reaching the limits of my trial-and-error approach. Which of these settings "should" be the most important? Through trial-and-error I was not able to get more than 70% CPU utilization and 63% memory utilization. I'd like both at 100% during a reload. All tables are InnoDB.

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• Applying flattened css to xhtml

  - by rahul

  Hi, I try to apply flattened css to xhtml (which get from websites). I am using css4j-0.12.1.jar (from http://www.informatica.info/projects/css/) to process the url html content. For a few urls the code seems to be hang. Even no exception is thrown. For a particular stylableelement or style code doesnot return any value and hangs. For a few websites code hang in, CSSStyleDeclaration.getPropertyValue(style); and for a few websites code hang in, CSSStylableElement.getComputedStyle(); I am using the latest jar. Could you please update me, is there any known issue or fix for this. I am not sure where to post this issue. If anyone knows please update me. Thanks in Advance.

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• Starting multiple applications in Ubuntu Unity

  - by Black

  I would like to start multiple GUI applications with a single script or command in Ubuntu 12. By now, I have a shell script that starts an application in the foreground and waits for the termination of the application afterwards starts several applications (like browser, mailer, IRC client) in the background The script is working, however all the applications are getting the same icon and are treated like different windows of one application, i.e. the script. Is there a way to start applications from a script, that makes Unity display the icons of the applications, e.g. the Thunderbird icon, instead of a single default icon for the script? The script looks like this: ! /bin/bash wait for termination... /usr/bin/libreoffice path/to/document in background /usr/bin/thunderbird & /usr/bin/pidgin &

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• What RAID level for a backup server?

  - by ispirto

  I'm building a server with 12 x 3TB disks to use daily backups. I'm thinking to use RAID50 to get a good 27TB usable space. The disks will be used brutally to backup 9 servers with 1.5TB of data once a day. I'll keep the backups for 2 days. So for each server I'll have 3TB of separate partitions. Do you think this kind of huge backups would stress the disks too much and make them fail? Should I better go with RAID10? Oktay

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• RAID 1 after install and two controlers

  - by jfreak53

  I have question regarding RAID 1. Can I setup software RAID 1 after having installed the first drive and setup ubuntu 12? I know that during server install and partitioning I can select RAID and setup then, but what I am not clear on is how in the world to setup RAID 1 after the fact? Can someone provide directions for this? Also, can I RAID 1 two drives one being 500GB and the mirror drive being 1TB? Of course the mirror drive would have a 500GB partition but that's my point. Lastly, can one drive be on IDE and the other on a SATA controller? I know speed will be an issue, that doesn't matter, I just need to know if it will work without corrupting data and if it's the same process? Thanks.

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• Windows 7 "Could not reconnect all network drives" on boot

  - by Thermionix

  Windows 7 won't reconnect to my network drives on startup. Once it is done booting opening Windows Explorer and clicking each share will mount them. Windows 7 Enterprise N Service Pack 1 I have attempted formatting the windows machine - first thing done to machine was to map the network drives, upon reboot they were disconnected. It is running on an Crucial M4 64gb SSD. The host of the network shares is a Ubuntu-Server machine connected through a gigabit switch. A modem provides dhcp, although both these machines have static IP's defined. It won't reconnect the drives regardless of whether they're SAMBA shares or NFS shares - therefore I believe it's an issue with the windows machine. Ubuntu 11.10 (GNU/Linux 3.0.0-12-server x86_64) I've tried using ip address instead of netbios name for mapping shares on the windows machine, Also tried setting EnableLinkedConnections=1 gpedit.msc Computer Configuration - Administrative Templates - System-Logon - always wait for the network at computer startup and logon = yes

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• Debian is equal to Ubuntu

  - by rkmax

  The title of the question is confusing, and does not explain my point well. I've always used Ubuntu server from version 10.04 and never had problem, now I have 4 machines with ubuntu 12.04.1 LTS installed on them and I found that under any circumstances where there is a high burden throws me a problem and machine crashes constantly. the most common is CPU#X stuck for Ns! Now I wonder if the administration of Debian is equal to that of ubuntu, regarding Servicos, packages, folders structure for example I would like to know if the services are installed in the same manner using invoke-rc.d, which handles additional security, including for not giving blind caning. I've been looking for a comparison chart but have not found anything yet, something between Debian 6.0.6 and Ubuntu 12.04 also the most common "hiccups" when you install the system

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• [SOLVED] vmware problems - networking - no packet response

  - by jack

  XP is my host. Ubuntu is my Guest in VMware. When I do the following commands, I should get SMTP respones but now get no response. I use wireshark to analayze it. Also in wireshark shows nothing. root@vmware:~# netcat 192.168.1.2 25 220 762462a8c4d Microsoft ESMTP MAIL Service, Version: 6.0.2600.5949 ready at Fri, 12 May 2010 18:04:20 +0800 EHLO SAYHELLO VRFY TEST@LOCALHOST test \ sdfsafsd How can I fix it? UPDATE: I came to know that this is no VMWare problem. This is Netcat problem. For this, you might have to type Ctrl+M {ENTER} {ENTER}

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• Authentication issues setting up iRedMail on Debian

  - by Sergio Rinaudo

  I'm setting up an exchange server using iRedMail. Following the official iRedMail installation guide (http://www.iredmail.org/install_iredmail_on_debian.html) and the Digital Ocean guide (https://www.digitalocean.com/community/articles/how-to-install-iredmail-on-ubuntu-12-04-x64) I was able to install iRedMail without any problems, so I have all the services up and running. I can configure domains and emails using iRedAdmin BUT I have problem both sending and receiving email, what I get from Roundcube is 'Authentication error' when trying to send an email. Also I can't receive anything. I also tried to connect to the mx server using telnet, it connects, but after the STARTTLS command, when I start to write "MAIL FROM:" the connection is lost. Something in the configuration is not working (at the moment I have the configuration written by the iRedMail installation) but I do not know where, I hope someone can enlight me! Thank you

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• XCP vm created via xl create doesn't show up in Xencenter neither in xe vm-list

  - by user138664

  i am running XCP 1.4.90.530.170661 and i have many PV guests running and created via XenCenter. I have created now an openwrt PV guest via the xl create command but it doesn't show up in Xencenter neither in the vm-list command: xe vm-list uuid ( RO) : 6d29aac1-67ff-f83e-4dbc-894a3b6b9c10 name-label ( RW): slitaz power-state ( RO): running uuid ( RO) : 07d96dd1-8223-cd1c-587d-ae37e48d267b name-label ( RW): xen-centos6 power-state ( RO): running uuid ( RO) : 3164bcf1-e43c-badb-e0cf-5423751fffb9 name-label ( RW): xenwin7 power-state ( RO): running uuid ( RO) : 8a31725e-4bcb-48ac-ba7b-e7c1ba310789 name-label ( RW): Control domain on host: xen-mini power-state ( RO): running xl list Name ID Mem VCPUs State Time(s) Domain-0 0 300 2 r----- 4862.5 xenwin7 2 766 1 -b---- 4933.1 slitaz 10 255 1 -b---- 30.8 xen-centos6 11 767 1 -b---- 46.9 openwrt 12 32 1 -b---- 6.8 are these two different kinds of PV vm? if yes, is there a way to export the "xl create" one as xva/ova and import it to show up like the others? Thanks in advance, /c/

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• Daily Weekly and Monthly DB backup with logrotate?

  - by benjisail

  I am currently keeping daily backup of my database by doing a daily mysqldump and by using logrotate to keep the 7 last days of mysqldump. I would like to improve this backup process to keep 7 daily backup, 3 weekly backups and 12 monthly backup. I found this article which explain how to di this with logrotate : http://www.hotcoding.com/os/sysadmin/35751.html However I am using the dateext logrotate option to name my backup files so I cannot use this solution. How can I do daily, weekly and monthly backup with logrotate and with the dateext option?

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• How anti-virus on the host machne affects performance of virtual machines?

  - by Ladislav Mrnka

  I'm diagnosing some issue with Oracle virtual box where virtual machine sometimes perform terribly slow (much slower then notebook with worse configuration): Notebook i7 (2 cores with HT = 4 logical CPUs), 4GB RAM, 5400 rpm disk, Win 7 64bit Virtual machine (Oracle Virtual Box) Host: i7 (4 cores with HT = 8 logical CPUs, 12 GB RAM, system runs from SSD, virtual machine from 7200 rpm disk, Win 7 64bit) Virtual machine: 4 cores assigned, 8 GB RAM assigned, Win 2008 R2 Enterprise (64 bit) Virtual machine uses bridge to separate network interface (machine has two) VPN for network communication No other virtual machine runs on the host Host has installed ESET Smart Security All SW is updated with last version. My question is if anti-virus on the host machine can somehow affect performance of the virtual machine and if so how can I turn it off without turning the anti-virus itself?

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• Strange Maintenance Plan SubPlans behaviour: each SP runs all the tasks of all other SP at odd times

  - by Wentu

  SQL Server 2005: I have a problem with scheduling a Maintenance Plan (MP) with 3 subplans (SP). SP1 is scheduled to run hourly, SP2 daily at 7.00 and SP3 on sundays at 8.00 Reading MP history I see that what happened (I know it seems crazy) is: 11: SP1 runs and executes all the tasks of SP1 SP2 and SP3 12: SP2 runs and does the same 13: SP3 runs and does the same 14: SP1 runs and does the same From the job Activity monitor, SP1 has last run time at 14, SP2 and SP3 are never been executed. All of the SP are scheduled correctly in the Job Activity Monitor (SP2 for tomorrow at 7, SP3 for next sunday at 8) Do you have any idea what is happening? Thankx a lot Wentu

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• Block by file type, but just file extension using MDaemon

  - by Arjun Rajagopalan

  I've had users sending copyrighted files (songs, videos) to each other over email. I blocked the file extensions .mp3 etc. What some users have done is to rename files to .doc etc. I cant block .doc etc filetypes because they are needed for day-to-day work. I'm using MDaemon 12 mailserver, Does anyone know how to make it block these attachments? I've been working on some content scanning for filetype code, but was wondering if there is a already made solution?

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• Java sound doesn't work under Linux

  - by Cliff

  I just installed Fedora 12 and after downloading and running the Java Sound Demo I get exceptions. If I run just a vanilla Java program that plays a .wav file it runs silently with no sound and no exceptions. Every other app seems to play sound. I also took some advice from this thread in the Ubuntu forums which almost seemed to work. (Installing aoss got rid of the initial exceptions in the sound demo but I still hear nothing when I play.) I'm getting frustrated by the individual hoops I have to go through to eek sound out of my speakers when running Java apps on Linux platforms! Can somebody help me figure out what's wrong?

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• sed comand - remove virus from wordpress [duplicate]

  - by EliaszKubala

  This question already has an answer here: How do I deal with a compromised server? 12 answers I have malicious code in every php file. This malicius code is auto paste at the beginning of file. I want to remove this with UNIX command from console. This is malicious code: <?php $guobywgpku = '..... u=$bhpegpvvmc-1; ?> I write this RegExp, "/<\?php \$guobywgpku.*\?>/m" and this RegExp work. I tested it here. The problem is, write command which remove this malicious code from every php file on the sever. Please Help me. Now i have something like this. sed "/<\?php \$guobywgpku.*\?>/m" index.php

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• Passenger package not found after adding phusion repo Ubuntu 12.04

  - by speshak

  I'm trying to install the official Passenger (and Nginx) packages from Phusion on an Ubuntu 12.04.3 server. I have the following in /etc/apt/sources.list.d/passenger: deb https://oss-binaries.phusionpassenger.com/apt/passenger precise main Even after running apt-get update there is no passenger package found by apt. I did verify that the package info appears in /var/lib/apt/lists/oss-binaries.phusionpassenger.com_apt_passenger_dists_precise_main_binary-amd64_Packages but at this point I'm at a loss as to why the package isn't available via apt-get. There are some packages (libapache2-mod-passenger, passenger-docs) that are available. These packages seem to also exist in universe, but apt-cache show lists both locations.

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