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• Web service not accessible from behind corporates firewalls - how come?

  - by Niro

  We run a Saas serving a widget which is embedded in customer websites. The service include static javascript code hosted on amazon S3 and dynamic part hosted on EC2 with Scalr (using scalr name servers). We received some feedback from users behind corporate firewalls that they cant access our service (while they can access the sites including the widget). This does not make sense to me since the service is using normal http calls on port 80 and our URL is quite new without any reason to be banned by firewalls. My questions are: 1. Why is the service is not accessible and what can I do about it? 2. Is it possible that one of the following is blocked by corporate firewalls: Amazon s3, the dynamic IP address provided by amazon, Scalr name servers. Any other possible reasons, way to check them and remedies for this? Thanks!

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• Should I have a heroku worker dyno for poll a AWS SQS?

  - by Luccas

  Im confusing about where should I have a script polling an Aws Sqs inside a Rails application. If I use a thread inside the web app probably it will use cpu cycles to listen this queue forever and then affecting performance. And if I reserve a single heroku worker dyno it costs $34.50 per month. It makes sense to pay this price for it for a single queue poll? Or it's not the case to use a worker for it? The script code: queue = AWS::SQS::Queue.new(SQSADDR['my_queue']) queue.poll(:idle_timeout => 20) do |msg| # code here end I need help!! Thanks

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• Windows refuses to believe printer is online unless I delete and re-add it

  - by Marcin

  I have a Canon MP560. It is online, in the sense that (a) I can connect to its internal web server; and (b) if I delete the printer in windows (windows 7), and reinstall it, windows will recognise that the printer is online, and talk to it. In all other cases, the windows and mac computers (purchased last week, running whatever is the latest and greatest mac os) in my household will simply not recognise that the printer is online. The printer is statically configured to use the same IP address, so that's not an issue. Because the printer works just fine with windows after delete and re-add, I assume that the issue with the mac is that I haven't installed whatever drivers Macs need to talk to Canon printers over a network.

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• Creating CNAME to delegated domain

  - by Starsky

  We are trying to configure F5 to do load balancing on 4 sub domains similar to this article... http://support.f5.com/kb/en-us/solutions/public/0000/200/sol277.html For Example prod.wip.example.com. NS F5NS1.example.com. prod.wip.example.com. NS F5NS2.example.com. test.wip.example.com. NS F5NS1.example.com. test.wip.example.com. NS F5NS2.example.com. Then we want to make cnames instead of delegating individual sub-domains, e.g. myapp.example.com CNAME prod.wip.example.com Microsoft DNS gives an error when I attempt to make the CNAME... dnscmd ns1 /recordadd example.com myapp CNAME myapp.prod.wip.example.com. Command failed: DNS_ERROR_NOT_ALLOWED_UNDER_DELEGATION 9563 (0000255b) The error makes perfect sense, but does anyone know of a way around it? Or are my NS records incorrect for this setup? Thank you, -Steve

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• AFP / Apple Filling Protocol aka Netatalk access over Internet

  - by PJJ

  I got a simple cloud server and thought it would be nice to have mac native afp Volumes accesss. Installed Netatalk and this seems to work pretty nice. No sensitive data or something but I don't like to wake up someday and have my www docs rm-rfed by some kid h4x0r. Q1: Is afp encrypted? Q2: How can I make it (semi)secure? Q3: Does VPN makes sense for this? Q4: What would you do to get afp working over net? Opening any service meant for Lan only is a basic flaw, i know - but me be ignorant about it. According to Apple Dev only the authentication is encrypted or am I mssing something?

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• iSCSI: LUNs per target?

  - by badnews

  My question relates specifically to ZFS/COMSTAR but I assume is generally applicable to any iSCSI system: Should one prefer to create a target for every LUN that you want to expose? Or is it good practise to have a single target with multiple LUNs? Does either approach have a performance impact? And is there some crossover point where the other approach makes sense? The use case is for VM disks, where each disk (zvol) is a LUN. So far we have created a a separate target for each VM; but a single target that contains all the LUNs would probably greatly simplify management... but we may need hundreds of LUNs per a single target. (And then possibly tens of initiator connections to that target)

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• How to forward UDP and TCP traffic from one IP to another

  - by Rishabh Agnihotri

  Well i have a server with two LAN Card Installed.I have a server in U.S and one in India.I have created a GRE tunnel to route all traffic from U.S Server to my Indian Server.My Traffic has UDP,TCP,HTTP,etc Traffic.Now i have two LAN Card on my Indian Server.Well i have configured two IPs on the system for some of my needs on the system.One is a /30 and another is a /24.Well now i want the /30 IP to talk to my /24 IP.Lets take a e.g the IPs are 180.151.130.34 - /30 and 103.243.19.254 -/24 I want to forward all the TCP,UDP,HTTP,etc like traffic coming to 180.151.130.34 to 103.243.19.254.In the sense i want to make them talk to each other in a way if a TCP/UDP Packet comes to 180.151.130.34 it should be forwarded to 103.243.19.254 and then that packet is sent back by 103.243.19.254 to 180.151.130.34.I am not able to configure this part.Can anyone tell me step by step how to do so? Well i forgot to specify i am using Windows Server 2008. Any help would be greatly appreciated.Thanks in advance.

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• EC2-like virtualisation platform with non-RDP access

  - by code'

  I'm looking into setting up a few small VMs. The trouble is the software I intend to install on them (Cisco VPN Client) blocks out networking (other than to the target VPN destination...) with no workaround. This means that Remote Desktop or other methods of connecting to VMs that go via the Internet (e.g. GoToMyPC, LogMeIn) are a non-starter. What I'm really looking for is an EC2-like platform but which gives direct access to the VM through (for example) Hyper-V Manager. Sadly the only way they all seem to offer to remote control the VMs is direct access via Remote Desktop, whereas I need to be one layer above that (if that makes sense). A viable alternative would be to run virtualisation software within a Windows EC2 instance; obviously hardware virtualisation is impossible but I wonder if there are any software virtualisation platforms that could be run and that would work. Does anyone know if something like this exists/is possible? Thanks! C

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• Does scheduling recycling app pool in IIS7 help the server conserve memory better?

  - by user29266

  Hello, I have a VPS (IIS7 with Win 2008) It's got: 40 websites and a SQL Server 2008 powering them with only 2 Gigs of RAM. None of the sites are mission critical, they are all just demos. I often have ram issues on the server because each site has does caching and generally uses a lot of memory. Would it make sense to set the application pools to recycle every 3 hours? I'm sure this would free up any memory leaks or processes left "hanging" Are there any other tips on this? Thank you very much!, Aron

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• remote desktop network failed connection

  - by tbischel

  I was trying to create a remote desktop connection from Windows XP to my Windows Vista Ultimate Addition machine at home. This normally works fine. Today after my connection was dropped, I tried to reconnect to my machine. It brings me to the normal startup screen, but when I tried to log in, it gave me the message "This network connection doesn't exist". This doesn't make much sense, as I have reached a Windows style login screen already. My connection returned later that day, but I'm curious as to what happened. Anyone see this before?

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• Disk space mismatch on OS X Server (Leopard)

  - by John Gardeniers

  My Nagios system sent me an alert to inform me that the disk space on one of the drives on our OS X server is very low. When I run df /Volumes/Apps/ I get /dev/disk0s3 117209520 114932472 2277048 99% /Volumes/Apps When I run du -c /Volumes/Apps it reports 11489944 total Why might there be such a vast difference? Even more importantly, how do I find the problem and what can I do about it? I'm essentially just a Windows admin, so am well out of my comfort zone here. I use a Mac but I'm not a Mac admin in any real sense of the word.

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• Nginx Restart Issues

  - by heavymark

  All of the sudden when restarting Nginx I get the following error: Restarting nginx: [alert]: could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied) 2011/02/16 17:20:58 [warn] 23925#0: the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:1 the configuration file /etc/nginx/nginx.conf syntax is ok 2011/02/16 17:20:58 [emerg] 23925#0: open() "/var/run/nginx.pid" failed (13: Permission denied) configuration file /etc/nginx/nginx.conf test failed On the front end part of the site loads but some files such as the CSS in particular are not loading. They exist on the server but when loading the resources directly in Chrome they say "Oops this page can't be found." I set a special group and user to run my apache files using suexec for my domain files. I think the nginx are owned by root however which I'm assuming is the problem but which nginx file ownerships would I change?

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• Disable Offline Files (mobsync.exe) on Windows 7 Home

  - by Synetech

  This morning I was watching the CPU graph of a Windows 7 Home laptop and noticed that every few seconds, the CPU would spike several percent. I watched the processes and determined that it was mobsync.exe (Offline Files) that was the culprit. I tried the usual steps that Googling turns up, and clicking the Manage Offline Files link to bring up the Offline Files dialog to click Disable Synch does not work because the dialog will not display. This makes sense since everything I have read indicates that Offline Files is not even included/supported in the Home version, so I am at a loss as to why it is running at all, let alone why it is sucking up CPU cycles. (My best guess is that it was started when they pressed Win+X to access the Mobility Center.) Of course I can just kill mobsync, but it could always just come back. How/why would mobsync be running on a Home version and how can it be disabled (of course the Group Policy editor is not available on a Home version).

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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• Adding a trigger command to autocomplete function in zsh

  - by mkaito

  When you define an alias like alias g=git, the shell will pick it up and run the corresponding autocomplete function. Now, there's a program out there called hub, which is basically a supserset of git, with some added, github-specific functionality. The recommended way to use hub is to alias git=hub. Of course, this won't trigger the autocomplete function for git, which makes sense. Now, if I wanted to have git's autocomplete trigger for hub, the only way I know of is editing /usr/share/zsh/functions/Completion/Unix/_git and adding hub in the first line as trigger. While this works, it isn't practical, since this file will get overwritten with the next zsh release. Assuming hub won't provide a zsh completion function any time soon, is there another way of adding hub to the trigger commands for git's autocomplete function?

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• X11 for apache user

  - by fuenfundachtzig

  We are using inkscape to convert SVG images uploaded to our server via a web form. For this inkscape offers a batch mode via the -z option, but this batch mode has a flaw: When inkscape is run by the apache user, it breaks saying $ inkscape -z -W drawing.svg X11 connection rejected because of wrong authentication. The application 'inkscape' lost its connection to the display localhost:11.0; most likely the X server was shut down or you killed/destroyed the application. If you do the same as a normal user you also get errors: Xlib: connection to "localhost:11.0" refused by server Xlib: PuTTY X11 proxy: MIT-MAGIC-COOKIE-1 data did not match (inkscape:24050): Gdk-CRITICAL **: gdk_display_list_devices: assertion `GDK_IS_DISPLAY (display)' failed 301.27942 But at least inkscape gives the correct answer (here the number stating the width of the image). Does somebody know how to make this also work for the apache user? Does it make sense to authorize apache to use X (if so how)? In any case it doesn't feel like the right solution...

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• Apache2 enable .ini mod in /etc/php5/mods-available

  - by GuiTeK

  One can use the a2enmod [module] command to enable mods located in /etc/apache2/mods-available. But what about mods in /etc/php5/mods-available? When I try to enable a mod in this directory (eg. xdebug), I get the following error: ERROR: Module xdebug does not exist! Yet, /etc/php5/mods-available/xdebug.ini exists. I understand a2enmod may work only with *.load files (it makes sense since *.ini files are just configuration files) but then what's the correct way of enabling modules located in /etc/php5/mods-available?

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• Should I Upgrade My Old Wireless Router?

  - by lyngbym

  I have an old wireless router, and I mean stone age old (5 years). There is nothing wrong technically with the router, it serves my wireless needs at home but it is really darn old. A search on Belkin's site for F5D7230-4 actually turns up a different old model so I scrounged up this old review for you to get a sense of what I'm running: http://www.pcmag.com/article2/0,2817,1572451,00.asp. Is there a valid security reason to replace this router in 2009? Google searches have turned up a few security threats to it and Belkin hasn't released new firmeware in years for it. I am starting to think I should replace it mainly because its NAT is about the only thing protecting me from the outside world. Buying a new wireless router is a boring way to spend money since it just sits on a shelf doing its job. Thoughts?

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• Make puppet agent restart itself

  - by SamKrieg

  I've got a file that notifies the puppet agent. In the network module, the proxy settings are included in the .gemrc file like this: file { "/root/.gemrc": content => "http_proxy: $http_proxy\n", notify => Service['puppet'], } The problem is that puppet stops and does not restart. Aug 31 12:05:13 snch7log01 puppet-agent[1117]: (/Stage[main]/Network/File[/root/.gemrc]/content) content changed '{md5}2b00042f7481c7b056c4b410d28f33cf' to '{md5}60b725f10c9c85c70d97880dfe8191b3' Aug 31 12:05:13 snch7log01 puppet-agent[1117]: Caught TERM; calling stop I assume the code does something like /etc/init.d/puppet stop && /etc/init.d/puppet start Since puppet is not running, it cannot start itself... it kind of makes sense. How to make puppet restart itself when this file changes? Note that this file may not exist as well.

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• Vantec NexStar NAS Encloser - Writing large files

  - by peter

  Hi, I have one of these 'Vantec NexStar LX - NST-475LX-BK' drive enclosures. It is a NAS drive. When I write a file to the device using eSata, or a SMB share I cannot write files over 2GB. I think this is because the drive is formatted with FAT32. But when I access the device using FTP it doesn't matter. I can write files of any size. E.g. I wrote one on there last night which was 30GB. Does this make any sense? Why? I guess the most important thing for me is data integrity.

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• options' default values of autoconf ./configure scripts

  - by hamstergene

  Having run ./configure --help there is a list of options that can be tweaked in the future build, for example --enable-luajit Enable LuaJit Support --disable-env clearing/setting of ENV vars Though any option can be used with enable and disable prefix, some are presented as --enable-me and other as --disable-me in the help output. Is this supposed to hint me of default values, and if yes, how do I to figure them out? Because either way makes sense to me: luajit is disabled by default and therefore it is presented as --enable-luajit so I can enable it by conveniently copy-pasting it from help output to command line. being listed with --enable in help output indicates that luajit is enabled by default.

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• MySQL replicate multiple places

  - by Frederik Nielsen

  Very trick task to find a good title for this question, but here goes the q: I have a few development machines, where I develop my PHP applications on, and testing via a local webserver. This works out pretty well for each machine. However, I would like to replicate the DB from my machines to a central location. So, to sum up: DEV1 - CENTRAL DEV2 - CENTRAL DEV3 - CENTRAL CENTRAL - DEV1 CENTRAL - DEV2 CENTRAL - DEV3 I hope this makes sense, as I cannot find an easy way to tell it. Basically, it is a 2-way replication, where all 4 databases contain the same info, and each of them can be updated locally, to then be pushed out to the others. Is this actually doable? All my dev machines are running Windows 7, and my central DB server is running CentOS 6.

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• Can make the proxy settings invisible when I share my internet connection via wifi?

  - by Neil

  This is probably a long shot... I have an HTC Desire and frustratingly found out after I got it that it doesn't support network proxy settings. We have a wireless network at my office that uses a proxy. My desktop at work runs ubuntu. I was wondering if the following set up would work: Plug a USB Wireless adapter into the desktop that has a working internet connection using the proxy. Setup the wireless adapter as an ad-hoc network Share the internet connection over the ad-hoc network. Make it so that the use of the proxy is invisible to users of the shared network connection. Connect the Android phone to the ad-hoc wireless network and utilise the internet connection. My question is this: Is this possible or should I give up now and not even try? I think I can handle steps 1, 2, 3 and 5. I just have no idea if step 4 even makes sense, let alone is possible. Thanks

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• Zabbix - Some of the monitored items dont get refreshd. how to find the reason?

  - by Niro

  I'm experiencing a strange issue with Zabbix monitoring a MySQL server. Most of the data from the server such as MySQL queries per second and MySQL uptime , Buffers memory etc. update nicely while some data like CPU iowait time (avg1) , Host local time ,MySQL number of threads and other items which were monitored in the past has last check time of about a week ago. I can't find any logic in this, for example Mysql number of threads and Mysql queries per second are obtained in a similar way so it does not make sense one of them is monitored and one is not. Please help- how can I fix this?

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• Command line audio library manager for Linux

  - by Ketil

  Hi all Hear is my set-up, I have a Linux server that is running Music Player Demon, all the audio files are under a dir (/muzik) which is exported by NFS. So to add files to the MPD database, I just drop the files into the /muzik NFS share and up date the MPD db, so far so good, but I would like to keep the dir strucher belowe /muzik in sum sort of order. To achieve this I am using Amarok, wich a start on my laptop and then use the organise files command to sort the files in into a sensible dir strucher based on the tags in the files. Do you know of any command line utility that can do the same thing that I am using Amarok for so I can run it from cron on the server and automate the process? I hope that this make sense.

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