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• Squid throws error, The requested URL could not be retrieved

  - by Supratik

  Hi Sometimes I am getting the following error The requested URL could not be retrieved While trying to retrieve the URL: http://groups.google.com/ The following error was encountered: Unable to determine IP address from host name for groups.google.com The dnsserver returned: Refused: The name server refuses to perform the specified operation. This means that: The cache was not able to resolve the hostname presented in the URL. Check if the address is correct. Your cache administrator is root. What could be the reason for the above error ? Regards Supratik

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• DNS for route between WAN & LAN

  - by David Maitland

  I have a few machines set up on my internal 192.168.1.* network and i have one public ip, my router is links all ports to on internal linux machine on my network 192.168.1.3. I want to know how to configure the DNS server on my linux box to forward to internal LAN ip's depending on the host name. EG. computer4.83.22.56.12 would find my box then forward to 192.168.1.4 on the local network. This is so i can run multiple web server under one ip. btw, i use Ubuntu. Thanks Dave

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• Permission denied on network share

  - by Philipp

  i have a Windows 8 host system running a virtual(hyper-v) Debian6 client with an lamp environment. My development environment runs under Windows and I mapped the folder with my php files to a network drive so Apache has access to them.(mount.cifs //pc/share /var/share/) This far no problems - I see my app on windows in the browser. The problem is, I can't write stuff in php to the share folder - everytime i got a permission denied message in my error logs. For testing purpose i tried to change the directory permissions of /var/share with chmod -R 777 /var/share without success. Now Iam a little bit stumped.. has anyone an idea how to solve this?

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• Cloud hosting and single hardware point of failure?

  - by PeterB

  From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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• Safari 7 SSL error if using IP-adress

  - by K. Biermann

  I have created my own CA for internal usage and set the root certificate to trustworthy on my machines. With this CA I signed the SSL-certificates for my internal servers. I only address them with their IP and so I used the servers' IP as certificate name. If i connect to the Servers with Chrome or mobile Safari it works without problems, but if I use Safari 7 under Mavericks (on the same machine with the same keychain) i get the following error: "The certificate is not valid (host name mismatch)". I double checked that I entered the correct IP ("https://192.168.2.130"), but I always get the same error. Do I need to enter a different name for the certificate or is it just that Safari doesn't support SSL certificates for IPs? Here is a screenshot of the error message (I can only post images with at least 10 rep): Safari's error message Thanks in advantage and please excuse my bad English :D

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• Why does try_files append each path together?

  - by Tom

  I'm using try_files like this: http { server { error_log /var/log/nginx debug; listen 127.0.0.1:8080; location / { index off default_type application/octet-stream; try_files /files1$uri /files2/$uri /files3$uri; } } } In the error log, it's showing this: *[error] 15077#0: 45399 rewrite or internal redirection cycle while internally redirecting to "/files1/files2/files3/path/to/my/image.png", client: 127.0.0.1, server: , request: "GET /path/to/my/image.png HTTP/1.1", host: "mydomain.com", referrer: "http://mydomain.com/folder" Can anyone tell me why nginx is looking for /files1/files2/files3/path/to/my/image.png instead of /files1/path/to/my/image.png, /files2/path/to/my/image.png and /files3/path/to/my/image.png? Thanks

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• How to properly set CPU Units for OpenVz VEs

  - by gucki

  According to all the sources I read (openvz wiki, various mailinglists, forums, ..) the values of the cpuunits settings are relative to each other. So when all are equal and the system is busy, all receive the same cpu share. But something still puzzles me with that: why is there a tool "vzcpucheck" which shows "the power of the node/ host": Current CPU utilization: 18000 Power of the node: 880001 Why is there (do I need) an absolute number when all settings are only relative? Shouldn't those two settings result in exactly the same? ve1: 1 ve2: 1 ve3: 1 = 3 ve1: 293334 ve1: 293334 ve1: 293334 = 880001 (power of the node) What's the difference?

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• How to setup a simple Ubuntu Server Tomcat cluster on VirtualBox for testing?

  - by Alex Pakka

  I am looking for a step by step instructions to setup at leat two (and later more) simple Ubuntu Virtual Core 12.10 Server VMs on Oracle VirtualBox under Windows 7 64bit. The test setup would be: Apache HTTP server on the Windows host acting as a Load Balancer. The result will be that going to http://localhost:8080 would balance between two nodes and prove session replication. Two lean, small footprint Ubuntu Server guest nodes with Java 7 and Tomcat 7. The intention is to help everyone doing High Availability / Load Balancing development and testing to create a reasonable environment on the local workstation or mainstream notebook in as little time as possible.

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• How to run statically linked programs on a shell account?

  - by user1125872

  I have a shell account where I am not allowed to compile anything. There are however tools I need to run, some very simple ones like Midnight Commander, mcedit, most, jed I am trying to find a staically linked version that "just works" in my shell. Could anyone give me any advice on where I could find statically builds? I have not been able to find it with google. I could compile it myself, but I would have to find out which headers I need to compile for. I have never tried to do it before, so any help would be greatly apprechiated! My host uses CloudLinux, output of uname -a: Linux hostname.domain.com 2.6.18-408.el5.lve0.8.61.1 #1 SMP Wed Apr 18 07:47:15 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux

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• Access denied for user 'diduser'@'localhost' to database 'diddata' (1044, 42000)

  - by Arlen Beiler

  I am trying to setup a MySQL server and when I went to create a second user it wouldn't give it permissions for the database. I can connect fine as long as I don't specify a database. Access denied for user 'user'@'localhost' to database 'diddata' The connection details are: { 'host' : 'localhost', 'user' : 'user', 'password' : 'password' , 'database': 'diddata' }; And to create the DB and table I did: CREATE DATABASE IF NOT exists diddata; CREATE USER 'user'@'localhost' IDENTIFIED BY 'password'; GRANT ALL ON user.* TO 'user'@'localhost'; Note that I've changed the username and password in this question. I've already checked the privileges in MySQL workbench and they are there.

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• Title: Better logging for cronjob output

  - by Stefan Lasiewski

  I am looking for a better way to log cronjobs. Most cronjobs tend to spam email or the console, get ignored, or create yet another logfile. In this case, I have a Nagios NSCA script which sends data to a central Nagios sever. This send_nsca script also prints a single status line to STDOUT, indicating success or failure. 0 * * * * root /usr/local/nagios/sbin/nsca_check_disk This emails the following message to root@localhost, which is then forwarded to my team of sysadmins. Spam. forwarded nsca_check_disk: 1 data packet(s) sent to host successfully. I'm looking for a log method which: Doesn't spam the messages to email or the console Don't create yet another krufty logfile which requires cleanup months or years later. Capture the log information somewhere, so it can be viewed later if desired. Works on most unixes Fits into an existing log infrastructure. Uses common syslog conventions like 'facility' Some of these are third party scripts, and don't always do logging internally.

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• Lost the shift+< and shift+> key combinations

  - by REA_ANDREW

  On my Laptop I have somehow lost the shift+< and shift+ key combinations. Setup: Ubuntu 12.10 OS Windows 7 running in Virtual box Synergyc running on the Linux Host Connected to Synergys running on my desktop machine, also running Ubuntu 12.10 Info The key mappings are fine in Linux. This has happened following an install of vsvim inside of Visual Studio 2012. Now globally inside this particular Virtual Box instance I can no longer use shift+< and shift+ Funnily enough when I go to the VS Key mapping finder it shows me that: Shift+< mapped to Ctrl+Shift+Alt+Z Shift+ mapped to Ctrl+Shift+Alt+X I have asked in super user as this is also affecting the windows environment. Any help, greatly appreciated. TIA

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• What exactly is an invalid HTTP_HOST header

  - by rolling stone

  I've implemented Django's relatively new allowed hosts setting, which is meant to prevent attackers from submitting requests with a fake HTTP Host header. Since adding that setting, I now get anywhere from 20-100 emails a day notifying me of invalid HTTP_HOST headers. I've copied in an example of a typical error message below. I'm hosting my site on EC2, and am relatively new to setting up/maintaining a server, so my question is what exactly is happening here, and what is the best way to manage these invalid and I assume malicious requests? [Django] ERROR: Invalid HTTP_HOST header: 'www.launchastartup.com'.You may need to add u'www.launchastartup.com' to ALLOWED_HOSTS.

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• Router not assigning an IP address after installing OS X 10.6

  - by Vaibhav Bajpai

  I recently installed Mac OS X 10.6, however the ethernet state is down. The assigned IP is 169.x.x.x. When booted the live USB of Ubuntu, I properly get an IP assigned in the range 192.168.1.x from the router 192.168.1.1 I am using the same router and same ethernet line. I tried to ping to 192.168.1.1 from my Mac and I get a host down message. I tried to manually assign the IP and set the router IP to 192.168.1.1 but still the router is unreachable.

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• XAMPP Closes the connection

  - by Miro Markarian

  I want my XAMPP Apache server to host a file (The file is around 250mb) but the server closes the connection and won't let me download the file? Does xampp or apache have any download size limit or something? Tested with a smaller file , the problem is still present. It just doesn't let me download any file from the server.!!! All I get in the error log is this: Fri Sep 07 23:21:31.742625 2012] [authz_core:debug] [pid 3664:tid 396] mod_authz_core.c(808): [client x.x.x.x:23409] AH01628: authorization result: granted (no directives), referer: http://ammiprox.tk/greeneyes2910/

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• Tons of spam on dreamhost mail user account

  - by user122022

  I use dreamhost for my webserver/ email host. I have about 25 users on one domain. and 1 of these users is absolutely inundated with spam every day. I have tried using dreamhosts poor blacklist feature, which was semi working (still letting a lot through) but I reached the 1000 email blacklist maximum very quickly. I have the ability to switch to google apps but that would be very expensive for 25 users. What options do I have aside from changing hosts with better spam filtering? I don't think its possible to only switch 1 user to google apps, it has to be the whole domain. There are other benefits to switching but I don't think they outweigh the cost for this company.

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• Can I run virtualized 64-bit Operating Systems if my CPU doesn't support VT-X?

  - by tintinmj

  I have installed VMWare 10.0 workstation on my Compaq CQ60-615DX laptop. The Operating System is Windows 7 Home Premium. When I tried to run Ubuntu 14.04 64-bit in a virtual machine in VMWare I get an error saying: This virtual machine is configured for 64-bit guest operating systems. However, 64-bit operation is not possible. This host does not support Intel VT-x. For more detailed information, see http://vmware.com/info?id=152. So I googled and found that I have to enable Intel VT-x. But I found out that my processor doesn't support Intel® Virtualization Technology (VT-x). So am I doomed and can I never run any virtual OS on my laptop? Or can I run 32-bit OSes?

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• Seeing DNS changes takes too long on my PC, can it be my router misconfiguration?

  - by Borek

  I administer a few sites and need to update their DNS entries from time to time, e.g., adding an A-record point certain subdomain to a certain IP. When I check sites like http://www.opendns.com/support/cache/, I can clearly see the DNS change taking effect throughout the world - is it just my PC that can't see this change (ping newsubdomain.example.org says it cannot resolve host name) The network "map" is like this: My PC -> my router -> my ISP's router -> internet On my PC, the DNS is set automatically which means that if I run iconfig /all, my router will be returned as the DNS server (192.168.1.1). On my router, the DNS is set to be what my ISP provided me with. Is this correct? What can I do to see new hostnames resolved quicker?

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• RV042 - how to broadcast UDP through VPN

  - by user47221

  I setup a gateway to gateway vpn connection with linksys RV042 router. i was able to ping each other, access file sharing ( with netbios enabled ). They are having same subnet mask 255.255.255.0, 192.168.1.0 <--- 192.168.2.0 Firewall disabled. But when i created/host LAN games (eg. warcraft3), it cannot be detect by clients at another site/LAN. As i know warcraft3 is using UDP broadcast to tell the client the game is creaetd. 1. How to broadcast UDP to another LAN ? any things to do with multicast ?

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• Zeroing SSD drives

  - by jtnire

  We host VPSes for customers. Each customer VPS is given an LVM LV on a standard spindle hard disk. If the customer were to leave, we zero out this LV ensuring that their data does not leak over to another customers. We are thinking of going with SSDs for our hosting business. Given that SSDs have the "wear levelling" technology, does that make zeroing pointless? Does this make this SSD idea unfeasable, given we can't allow customer data to leak over to another customer? Thanks

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• Windows Server 2012 is telling me it's not activated when it is

  - by LeonidasFett

  I have a Windows Server 2012 Machine were I need to do some development. The machine is a Hyper-V VM. I activated it with a valid key and restarted the VM. After it booted up again, I went into system properties and saw that it said that Windows is activated. However, there is still the message "Activate Windows" on the desktop wallpaper and if try to change something (for example, the look) it tells me that I need to activate first. Is there anybody who has experienced this? The host OS is Windows 8.1. I already installed all updates and tried to activate again using this CMD-Command: slmgr.vbs /ipk {product key, including dashes}

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• How much does SQL Server Web Edition cost? + other related questions

  - by Goma

  Hello. I visited Microsoft pricing page about SQL Server databases, but it was not that clear for me. I want to know the exact cost of SQL Server Web Edition. Furthermore, I would like to know how can I get it if I am with VPS hosting? Should I install it by myself or will they install it for me? And finally, is there a web host that provide SQL Server Web edition so I pay for them directly with the hosting package?

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• how to know who is accessing my system?

  - by calvin

  Is it possible to know if anyone is accessing any of folders or drives in my system(32 bit windows 2003)? I mean shared folders or non-shared folders, anything. And once if we know, how to deny access to particular host. For shared folders i know how to do, but if anyone is accessing some folder with proper credentials, i don't know how to control. Please ignore cases like bit torrent etc. All i wanted to know is if anyone is accessing my system folders in this way \\10.30.188.231\d$\calvin_docs with some valid username and password. I wanted to know ip/username of system who is accessing

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• Make the recycle bin of the SSD on a RAID0 drive?

  - by Rolnik

  I don't know about you folks, but I hate the idea of junk sitting on my tiny 30GB SSD. Any way to designate another drive to be the host of the Recycle Bin for items formerly on the SSD? Basically, I need to know how to make a lower-priority drive receive the recycled materials from the 'main' drive, which happens to be short on space. The best thing I can think of is a batch file that a) syncs 'recycle' to another drive; and b) empties the recycle bin. ... but that's too much work for me.

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• Automating the installation using SSH

  - by RAY

  I am running a bash script from a remote host to run a binary file which installs 64 bit JDK 6 update 29 on multiple VMs across the Environment. It is installing the file but, at the last line i have to hit a enter to complete the installation. I want to fully automate the script where i do not have to hit the enter at the last line. This is what i am using ssh ${V_TIERS}@${V_TIERS} 'cd JDK; sh jdk-6u29-solaris-sparcv9.sh' It updates as desired, but during install i have to hit enter to continue and complete the installation. Can anybody please help to fully automate the update process.

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