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• Ask a DNS server what sites it hosts - and how to possibly prevent misuse

  - by Exit

  I've got a server which I host my company website as well as some of my clients. I noticed a domain which I created, but never used, was being attacked by a poke and hope hacker. I imagine that the hacker collected the domain from either hitting my DNS server and requesting what domains are hosted. So, in the interest of prevention and better server management, how would I ask my own DNS server (Linux CentOS 4) what sites are being hosted on it? Also, is there a way to prevent these types of attacks by hiding this information? I would assume that DNS servers would need to keep some information public, but I'm not sure if there is something that most hosts do to help prevent these bandwidth wasting poke and hope attacks. Thanks in advance.

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• fail2ban with Cloudflare

  - by tatersalad58

  I'm using fail2ban to block web vulnerability scanners. It is working correctly when visiting the site if CloudFlare is bypassed, but a user can still access it if going through it. I have mod_cloudflare installed. Is it possible to block users with IPtables when using Cloudflare? Ubuntu Server 12.04 32-bit Access.log: 112.64.89.231 - - [29/Aug/2012:19:16:01 -0500] "GET /muieblackcat HTTP/1.1" 404 469 "-" "-" Jail.conf [apache-probe] enabled = true port = http,https filter = apache-probe logpath = /var/log/apache2/access.log action = iptables-multiport[name=apache-probe, port="http,https", protocol=tcp] maxretry = 1 bantime = 30 # Test Apache-probe.conf [Definition] failregex = ^<HOST>.*"GET \/muieblackcat HTTP\/1\.1".* ignoreregex =

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• 421 Concurrent Connections - Ratelimit from helpdesk to rackspace server

  - by g18c

  We have Kayako helpdesk running on our WHM Linux server. When e-mails come in from customers, notifications are sent out by Kayako to a number of staff whose mailboxes are hosted on Rackspace mail servers. I noticed a large queue in the Exim queued message viewer of WHM - when looking in Exim logs I can see many lines 2012-10-13 20:06:56 1TN72s-0007Cw-1l SMTP error from remote mail server after initial connection: host mx2.emailsrvr.com [173.203.2.32]: 421 Too many concurrent connections from this client. One client email results in about 5 emails to rackspace servers, perhaps 60 emails per 1 hour on average - not a huge amount but enough to cause messages to be rejected when sent in short bursts. In this case ideally if we can limit the connections sent to the rackspace server we can comply with their limit. For our requirements if we send 1 email every10 seconds or so, this would be OK. Messages to all other servers should go through a normal rates, only mx1.emailsrvr.com and mx2.emailsrvr.com should have this connection limit policy applied. Is this possible?

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• Getting rid of Plesk on a VPS

  - by TomA

  I've been using a relatively expensive VPS for hosting about 30 domains and I want to migrate to a cheaper one, without Plesk. Both use CentOS. My users will not care, they don't use Plesk anyway. But I will not be able to use it for creating new virtual hosts, FTP accounts etc. I'm not a commandline guru, esp. not in a server environment. Is there a free Plesk alternative for these purposes? I need to: Create a new virtual host with it's own FTP account Setup some basic FTP quota I don't need: DNS management (the new VPS service has an external DNS management GUI) Mail server management (I use Google Apps) Any suggestions welcome, from Plesk alternatives to "RTFM" or links to tutorials.

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• Rewrite URL before passing to proxy Lighttpd

  - by futureelite7

  Hi, I'm trying to setup a reverse proxy in lighttpd, such that all requests (and only those requests) under /mobile/video is redirected to the / directory of a secondary web server. This is pretty easy in apache, but I can't for the life of me figure out how to do so in lighttpd. $HTTP["url"] =~ "^/wsmobile/video/" { url.rewrite-once = ( ".*" => "/test/" ) proxy.server = ( "" => ( ( "host" => "210.200.144.26", "port" => 9091 ) ) ) } I've tried using the http["url"] directive, but lighttpd simply ignore those requests and continue to pass the full url to the secondary server, which of course chokes and throws 404s. However, if I do a global rewrite then everything gets forwarded to the secondary server, which is also not what I want. How do I go about this task?

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• Monitoring Maximum Process Network Activity

  - by user125973

  We have a collocated server on which we run some OpenVZ hosts. Recently, we have had to pay a lot extra we keep exceeding our bandwidth quota. Our quota is 5 Mb/s but we have spike to almost 50. I looked at the graphs and there are some spikes happening at some intervals. I want to know which process is causing this so I need a tool that monitors the processes and gives me the one with the maximum instant traffic (It doesn't matter how much traffic we have as long as we don't exceed the 5Mb/s quota). Does anyone have a recommendation for this? My hosts are CentOS 5 with OpenVZ so I can see all the containter processes from the host, if that helps in any way.

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• "Server not found" for live version of site

  - by user1491819

  I can access my local dev site on my local pc, eg: http://mysite But I cannot access the live site, even though it works fine on other pc's: http://www.mysite.com The live site gives the error in Firefox: Server Not Found. Pinging www.mysite.com gives the error:"Ping request could not find host www.mysite.com" hosts file: 127.0.0.1 mysite I changed the hosts file to the following and rebooted: 127.0.0.1 mysitedev I'm running on XP, and have cleared the DNS cache using: ipconfig /flushdns I have verified the live site is up using: http://www.isup.me/ and the site loads fine using my phone. What could be preventing my local pc from accessing the live site?

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• MySQL replication/connection failing over SSL

  - by Marcel Tjandraatmadja

  I set up two MySQL servers where one is replicating from the other. They both work perfectly, but once I turn on SSL I get the following error: ERROR 2026 (HY000): SSL connection error I get the same error running from command line like so: mysql --ssl=1 --ssl-ca=/etc/mysql/certificates/ca-cert.pem --ssl-cert=/etc/mysql/certificates/client-cert.pem --ssl-key=/etc/mysql/certificates/client-key.pem --user=slave --password=slavepassword --host=master.url.com Both MySQL servers are running on version 5.0.77. There is a difference that MySQL in the master server was compiled under x86_64 while in the slave server under i686. Also both machines are running CentOS 5. Plus I generated certificates as per this page. Any idea for finding a solution?

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• Virtual fiber channel HBA in Solaris

  - by Phil

  We are trying to set up some virtual Fibre Channel HBA's in Solaris. This seems to be possible with NPIV. Creating NPIV's in a Solaris global zone works fine, but passing that NPIV to a zone didn't work at all. We tried to pass the NPIV as following: # zonecfg -z zone1 'info' zonename: studentz1 [...] device: match: /devices/pci@0,0/pci8086,25f9@6/pci8086,350c@0,3/pci1077,140@4/fp@1,0:devctl allow-partition not specified allow-raw-io not specified Wat we want to do is, set up an environment for SAN exercises. We don't have a physical host per student, so we try to virtualise that in some way (Solaris zones or VMware). It should be possible to display the WWN of the virtual HBA and mount the storage presented by the disk subsystem. Any ideas to pass the NPIV to a solaris zone or to virtualise this with vmware?

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• Virtualbox PXE Boot Failing with a Windows Server 2008 R2 Server

  - by Vbitz

  Some fast help on this would be good, I have been on this problem for 14 hours. In a Virtualbox test environment I have 2 virtual machines networked together using a internal network (no traffic runs though the host, it is all at a software level). One is a fresh client with 512mb of ram and a dual core set-up, the other is the server with 1.5GB of ram and running server 2008 r2. The server is configured as a dns server, dchp server, domain controller and also serves PXE booting though WDS (Windows Deployment Services). Both machines can see each other and I am able to start a network boot. The issue comes at the second to last stage of the pre windows PE install. On TFTP download of boot.sdi it starts it but stops during the boot process.

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• zsh right-justify in ps1

  - by Nate

  I'd like a multi-line zsh prompt with a right alined part, that will look something like this: 2.nate@host:/current/dir 16:00 -> I know about RPROMPT in zsh, but that has a right-aligned prompt opposite your normal prompt, which is on the same line of text as your typing. Is there a way to have a right-aligned portion to the first line of a multi-line command prompt? I'm looking for either a directive in the PS1 variable that says 'right align now' or a variable that is to PS1 what RPROMPT is to PROMPT. Thanks!

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• How to map DNS with my new IP address? [closed]

  - by Carsen

  I have installed apache2 in my ubuntu server. In apache2.conf, i have specified this <VirtualHost *:80> ServerName something.in DocumentRoot somewhere/public <Directory somewhere/public> AllowOverride all Options -MultiViews </Directory> </VirtualHost> Also, i have my Domain - something.in registered with Go Daddy. There i have changed A(HOST) to point to XXX.XXX.XX.XXX which is my public address. But when i type something.in in browser, i am not getting my apps home page. I got my public IP address as "XXX.XXX.XX.XXX is Natted to XX.XX.X.XX". which IP address should i use in my DNS settings? How to make apache2 in my ubuntu server listen to request for something.in?

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• Yet another "can't connect to MySQL over the network" question - but i seriously tried everything

  - by mireille raad

  Hello, I was left with the easy task of installing moodle. I am VPNing to 2 servers, one for the database and the other apache/php server 1 must connect over LAN to the mySQL db on server 2 I added a user with following priveleges : +---------------+------------+ | host | user | +---------------+------------+ | % | mir | | 10.10.40.15 | mir | | x.x.x.x | mir | | localhost | mir | Disabled firewall temporary made sure that my username/password combinations are correct, flushed priveleges, restarted mysqld i wnt to /etc/my.cnf .. if i try to add the port=3306 bind-address=10.10.40.15 or anything that is different from 0.0.0.0 or 127.0.0.1 - mysql wouldn't restart i read and tried many forums and pages and asked friends for tips but nothing works So my question to you : are there any networking extensions that need to be installed for mysql, how do i know nothing is missing from the installation any troubleshooting tips, any idea how to fix this, any step by step check list, am i missing something simple/stupid, please anything that comes to mind, let me know Appreciate your feedback on this friday night stuck at work :P

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• Problem Adding Windows 7 64-bit print drivers to 32-bit Windows 2003 Print Server

  - by Richard West

  I have installed the final RTM version of Windows 7 professional 64 bit on a test system before we begin the roll out in our company. I'm having problems connecting to several HP printers that we have on the network. These printers are being shared from a Windows 2003 server host. I have downloaded the lastest HP Universal Printer dirver, however I'm unable to add the 64 bit driver onto the 2003 server system (it's 32 bit). Does anyone have any advice on how I can get connected to these printers from the Windows 7 system?

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• Setting up a static IP address (public) in Ubuntu

  - by ycseattle

  I have a business class internet connection and need to setup a static ip address for a machine. I did a search online and only find how to setup static local ip addresses (like 192.168..). I tried the same technique, and only setup the ip address and netmask, but after restart networking the computer could not connect to the outside world. This is what I did: 1) edit /etc/network/interfaces iface eth0 inet static address 173.10.xxx.xx netmask 255.255.255.252 2) edit /etc/resolv.conf search wp.comcast.net nameserver xx.xx.xx.xxx nameserver xx.xx.xx.xxx 3) restart network sudo /etc/init.d/networking restart Now the last step didn't report error, ifconfig shows the ip address was set, but this server cannot connect to outside world, ping google.com and reports "unknown host google.com". Any ideas?

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• Windows XP app not able to talk to web server

  - by weotch

  My company makes an app built with Adobe Air which talks to our webserver for user authentication. Some users are not able to login. Running Charles Proxy tells us that the "host cannot be found." Loading up the webserver in IE, initially we weren't able to visit the site, we had to add it to trusted sites. My guess is that some security setting is denying our app as well. Does anyone have any suggestions as far as where to make security looser for our app?

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• VMWare Workstation Performance

  - by tekiegreg

  Hi there, awhile ago I upgraded my laptop to Windows 7 x64 from Windows XP 32 bit edition. However not before virtualizing the physical installation and I continue to run it under VMWare Workstation today. The performance on the resulting VM is just absolutely atrocious! I've done a lot of uninstalling stuff that's not longer needed since the machine is virtual in an effort to reduce RAM, but in general the responsiveness seems sluggish. I also run the Virtual Machine on it's own separate HD that is seldom used by the host OS. I'm just hoping for some general tips in increasing VMWare performance anywhere, thoughts? EDIT: Both of the below answers were excellent starting points for me. However I did like the selected answer's strategies on disk management. I am running the Virtual Machine in a separate external hard disk, likely I'm going to have to reconfigure somehow. Thanks all!

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• How to spawn-fcgi multiple fcgi processes ?

  - by Shrinath

  We have nginx installed and would like to spawn-fcgi multiple ".fcgi" files. The programs were written in C. How do we spawn all the files at one go ? Edit This is the scenario : I have 3 different programs to serve. Lets say, I've search results from google, yahoo, bing. I want to show 3 columns which host results of above providers. I have 3 fcgi scripts, one for each provider. How do you suggest I put all 3 into action ?

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• forwarding port 3306 on macosx in order to connect to a remote mysql db

  - by Jonathan Mayhak

  I'm on macosx 10.6.2 trying to connect to ubuntu server 8.04.1 at linode. ssh -L 127.0.0.1:3306:[[remote ip]]:3306 user@server -N I want to set up ssh tunneling so that I can access a remote mysql server. First of all, I'm told bind: Address already in use. This is only after I've tried the command before. How do I manually close a port forwarding session? Second, when I change the command to be ssh -L 127.0.0.1:3310:[[remote ip]]:3306 user@server -N (I changed the local port to listen on). I'm told channel 1: open failed: connect failed: Connection refused when I try to connect to the mysql server via mysql workbench or sequel pro. To connect through mysql workbench I use the following settings: host: 127.0.0.1 port: 3310 (if 3306 is in use) username: mysql username password: mysql password database: I don't put anything in

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• How can I suppress /etc/issue without losing error messages?

  - by Andy

  Is it possible to tell the ssh client to not print the connects of /etc/issue to stdout when connecting to a remote host, but to print out any other diagnostic (e.g. error) messages? Either using ssh -q or having LogLevel quiet in ~/.ssh/config suppresses the /etc/issue printing, but also turn off error messages. I've tried touching ~/.hushlogin as well - that stops /etc/motd being printed, but doesn't affect /etc/issue. The most obvious solution is just to remove /etc/issue, but company policy dictates the file be there with dire warnings about unauthorised access. This is non-negotiable. Unfortunately, I've got a bunch of scripts that run across quite a few hosts via ssh, and the log files are a) very large and b) full of legalese. Since quite a lot of stuff runs unattended, I don't want to lose any error messages that are printed.

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• Multiple PHP versions running as cgi

  - by Pierre

  I'm trying to install a second version of PHP, to run alongside the current version of php. I've compiled the latest php source from github (5.5-DEV), and I'm trying to run it as CGI. Here is my virtual host config: <VirtualHost *:8055> DocumentRoot /Library/WebServer/Documents/ ScriptAlias /cgi-bin/ /usr/local/php55/cgi Action php55-cgi /cgi-bin/php-cgi AddHandler php55-cgi .php <Directory /Library/WebServer/Documents/> Options Indexes FollowSymLinks Includes ExecCGI AllowOverride All Order Allow,Deny Allow from all </Directory> DirectoryIndex index.html index.php </VirtualHost> But when I go to http://127.0.0.1:8055/info.php, I get the following error: Forbidden You don't have permission to access /cgi-bin/php-cgi/info.php on this server Edit I'm now switching between LoadModule php5_module /usr/local/php54/libphp5.so and LoadModule php5_module /usr/local/php55/libphp5.so It works for now, but is not ideal. I would like to have the different versions of php on different virtual hosts

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• Mount shared folder (vbox) as another user

  - by jlcd

  I'm trying to mount my vbox shared folder every time my ubuntu starts. So, I added an entry on /etc/init with this: description "mount vboxsf Desktop" start on startup task exec mount -t vboxsf Desktop /var/www/shared Seems to work, except by the fact that all the files are owned by "root", and I don't have permission to write on the folder (neither chmod nor chown seems to be working). So, how can I make all the files under this shared folder to be owned by www-data user/group? Thanks ps.: The main reason for me to have an automatic shared folder, is so I can create/edit files from the HOST on the GUEST www folder. If you have a better idea for that, instead of sharing the folder, fell free to say.

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• Finding a message in an archive in Kerio MailServer 6

  - by Karl Cassar

  I need to locate some emails from the archive. Kerio is set to archive emails on a daily basis, keeping the last 2 months. From the mail log, I found entries like: [09/Oct/2012 18:02:20] Recv: Queue-ID: 5074589c-00004ddb, Service: SMTP, From: <info@XXXXXXXXXXXX>, To: <Suzette@xxxxxxxxxxx>, Size: 699, Sender-Host: mail.XXXXXXXXXXX, User: automailer@XXXXXXXXXXXXXXX I need to locate this specific email. The archive folder has a lot of ZIP files like: 2012-Oct-06 2012-Oct-07 2012-Oct-08 2012-Oct-09 ... I assumed this would be in the 2012-Oct-09 zip file. I extracted it, and the zip file contains a lot of emails in the /#msgs/ folder, named: 0000000a.eml 0000000b.eml 0000000c.eml ... I did a search for the last part of the Queue-ID, 00004ddb, but it returned no results. I tried other random searches for other emails in the mail log, but I couldn't find a single one. Any idea how one goes about finding such an email in the archive?

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• Windows Server 2008 hangs up while booting

  - by Jim R

  Windows Server 2008 hangs up while booting after Windows update applied several updates. The server is a virtual instance on a Server 2008 Hyper-V host. Other virtual servers are fine, but have not been updated. The normal boot shows the horizontal barber poll forever. When I do a safe boot it also hangs up. With a "Please Wait..." after loading many '.sys' files. The last successfully loaded file listed is: '\Windows\system32\drivers\crcdisk.sys' That is the extent of what I have been able to determine.

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• Forwarding port 3306 on Mac OS X in order to connect to a remote MySQL Database

  - by Jonathan Mayhak

  I'm on Mac OS X 10.6.2 trying to connect to ubuntu server 8.04.1 at linode. ssh -L 127.0.0.1:3306:[[remote ip]]:3306 user@server -N I want to set up ssh tunneling so that I can access a remote mysql server. First of all, I'm told bind: Address already in use. This is only after I've tried the command before. How do I manually close a port forwarding session? Second, when I change the command to be ssh -L 127.0.0.1:3310:[[remote ip]]:3306 user@server -N (I changed the local port to listen on). I'm told channel 1: open failed: connect failed: Connection refused when I try to connect to the MySQL server via MySQL workbench or sequel pro. To connect through MySQL workbench I use the following settings: host: 127.0.0.1 port: 3310 (if 3306 is in use) username: mysql username password: mysql password database: I don't put anything in

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