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• Centos 6.2, Apache 2 and Listen port for socket connection

  - by salvosav

  I'm trying to make a socket connection between a client and my server through a php script. To do this, I opened a port on iptables, and configure a virtual host with apache to redirect all traffic from my door to the folder that contains the file index.php, which is my script. Doing some tests the door is open, but using command netstat -ltn , I see ':::35100'. Looking on the net I understand if in this way is only listen inward and not outward. But I don't understand how can I turn this ':::35100 '-' in this '0.0.0.0:35100 '. Or, better yet, how to add this rule. Any ideas? thanks

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• Clients can make maximum only 15 connections to ubuntu custom server

  - by gtan

  I have a custom server in C# being run on Ubuntu 9 under mono. I can make up to 15 silverlight clients connect to the server. When I make the 16th, it just waits. And if I close one of the established connections, the 16th client is able to connect. I am making the connections from one machine. I am also not exceeding any file handle limit. The limit is 1024 and I am having around 300. Any ideas how to make more connections? Also why the number 15? Is it something linux-specific? EDIT: I have run the same server on an Ubuntu 11.10 virtual machine and was able to make more than 15 connections. I presume it's a configuration problem on the Ubuntu 9 machine then. Any help on that?

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• Route using certain IP address

  - by spa

  I have a server with two public IPs. Both IPs are added to eth0 using ip addr add. Now I'd like to contact a server which uses IP address filtering. Only requests are allowed which use the second IP address. Is there are way to set this up using the standard route command in Linux? I guess that's not the case. So the only solution I see right now: Setup a virtual device let's say eth0:0 and bind the second IP address to it. Then I can reference the device in the route command. Edit: I can't use the second IP as primary one easily as this IP is used as failover IP.

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• Need hosting (e-mail, http) for external domains

  - by disappointed

  This may not be the right place, but since it is a more technical aspect of the hosting world, I am taking the liberty to ask: I'm currently running a virtual server with nginx and postfix for web and e-mail, but I can't handle the administration and, due to frequent problems with e-mail services, I need to resolve this with a almost-standard hosting package (anything should work, even 5 MB static files would be OK). The exception being that I would like to use several domains, hosted with different registrars, for web and e-mail. Currently, this is a very simple configuration in my setup. All hosters I have looked at seem to think this a costly business (more than domain registration costs), but of course the recommend to transfer domains to them (they want the $$). Does anyone know of a hosting company that allows its customers to freely manage domains registered somewhere else?

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• mongodb replication: no primary elected

  - by Max

  I have three servers with mongod installed on it running as a replication set. Suddenly the two secondories became unavailable (the mongod process died) - I think because they were too stale. The problem is that the original PRIMARY is now the SECONDARY and my application doesn't work because it can't connect to a PRIMARY. I mean, in which way does that help me? If the replica set can't do failover?! Am I missing something? Furhtermore I am asking myself why did the SECONDARIES die / why are they too stale? What can I do about it? FYI: My database is quite big (40GB on disk).

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• Does "I securely erased my drive" really work with Truecrypt partitions?

  - by TheLQ

  When you look at Truecrypt's Plausible Deniability page it says that one of the reasons for partition with solely random data is that you securely erased your drive. But what about the partition table with full disk encryption? How can you explain why the partition table says there's a partition of unknown type (With my limited knowledge of partition tables I think that they store all the partition filesystem types) and with solely random data? It seems that if your going to securely erase the drive you would destroy everything, including the partition table. And even if you just wiped the partition, the partition table would still say that the partition was originally NTFS, which it isn't anymore. Does the "I securely erased my drive" excuse still work here? (Note: I know that there's hidden truecrypt volumes, but I'm avoiding them due to the high risk of data loss)

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• Apache logging: rotating logs on Win32?

  - by Jason S

  I was noticing my disk space disappearing faster than expected, and finally narrowed it down to a rewrite.log file that was 4 GB in size! Is there a way to rotate the various Apache logs (rewrite, error, access, etc.) on a Win32 PC so that only the most recent entries are there and I can limit the data size that results? I found the bit about log rotation on Apache's website but it's Unix-centric. Edit: I got rotatelogs.exe to work, and it's great except that it slows the server response down noticably so I rejected the idea of using it.

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• Modify Oracle SOA Suite 11g repository DB config

  - by Alfabravo

  Hello there! Don't know if this question goes here or in superuser. Anyhow, let's try. I have an Oracle SOA Suite installed in a server. The repository database is installed in another server. Both are virtual. Sadly, we don't have snapshots neither UPS and lights went off yesterday... the repo database is now a bunch of unformed bits and we need to recreate it. ¿Is there any way to reconfigure Oracle SOA Suite to use a brand new repository? Or should I paninfully reinstall the whole crap? Thanks in advance.

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• Manual vmware image creation

  - by Gzorg

  A laptop hard disk is being defective, but I managed to be lucky enough to get access to it, using an Ubuntu live cd. Now, I think it would be nice to dump the whole thing, using, for instance, a combination of gzip and split. But that would make the resulting files unusable. I could make a VMware image of it instead. I'm currently looking for the answer, which involves finding how vmware manages fixed size virtual partitions, but maybe you already did this before. Thanks.

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• Friend wants to return an iMac with Lion in it. How does he remove his personal info / do clean install?

  - by fakaff

  I have a Mac, but not Lion, and it seems like a lot has changed with Lion. He wants to return the computer. I told him doing a clean install will make it like new, but he says you can't download a bootable disk image from the appstore to do this. He doesn't want to torrent it because he thinks the store will know it's a ripped version. Is there a way for him to remove his Admin account so that none of his personal info remians on the machine?

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• Windows 8.1 reset

  - by CreeperInATardis

  I recently had a massive crash on my Windows 8.1 partition, which has rendered it (practically) unusable. I tried to do a refresh, but the problem is, I have a Windows 8 install disk, not 8.1, and thus it didn't work. I also do not have any system restore points/backups of any sort, but I have managed to move my files off. Also, I do not know where my product key is (and cannot find it online), so a clean reinstall would not work. My question is, is there any way to change my Windows 8 disc into an 8.1 disc to allow me to refresh/reset my PC, or is there any other way to do this (aside from repurchasing?) Thanks!

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• Network Bypass - PC Registration Page - I'm trying to bypass a college Registration Page so I can ac

  - by Kamron3

  What I'm trying to do: Connect to the internet without registering But! Here's my problem: I can't connect. I used to be able to, now when I try to connect it says "Server not found." I can connect just fine on my other Laptop. I did a test as well. I used a LAN USB adapter and could connect fine, then now I can't connect again. Possibly because I am using uTorrent to download stuff, but I want to connect again Is there anyway I can use some sort of "virtual adapter"-type of connection where it masks my actual adapter? How can I connect to the connection without having to buy more and more Network USB Adapters? Thanks much!

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• Mac OS X 10.5 VNC Resolution independent of hardware display

  - by Qberticus

  Is it possible to set the VNC display resolution that is independent of the hardware resolution when you are using OS X 10.5 Screen Sharing? I have a macbook and a windows box with 3 monitors. I'd like to use the 3 monitors on my windows box to do work on my macbook when I'm at my desk. When I VNC into the macbook I only get the resolution of the hardware screen (1280x800). Instead I'd like to use two of my monitors on my windows box to display a large VNC screen from my macbook. The scaling options in the VNC clients (TightVNC and Ultr@VNC) do not adjust the actual resolution of the display they just do image processing. My ultimate goal is for someway to have a virtual display on my windows box that is from my macbook that is independent of the macbook's hardware screen.

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• How to deploy Windows-8 Enterprise Apps to other users?

  - by TToni

  Windows-8 (Metro) Apps can be installed using "sideloading", bypassing the Windows store in enterprise environments. In principle this is easy: Once you enabled sideloading (which is automatically done when a Win8-machine joins a domain), you can install a signed appx-Package through PowerShell with the "Add-AppxPackage" command. But there is a catch: The App is only installed for the user who executes the command and there is no "-Credentials" parameter! I can probably solve that problem in my specific scenario, where I deploy a self-developed app through TFS build to a virtual machine with a fixed demo user (by using remote powershell in combination with "Add-Job", which does take a credential parameter and because I know the given username and the password). But that is not true in an enterprise environment, where I want to distribute my App to thousands of users. Cracking all their passwords seems a bit over the top, so what would be the "correct" way to do this? I can't find any useful information from Microsoft about this, but maybe one of you already ran into this problem and solved it?

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• Saving backup files automatically in (g)Vim after saving a file.

  - by Somebody still uses you MS-DOS

  I had a problem with my gVim. I lost some important modifications after I plugged on my machine after a hibernating process. To avoid this kind of problem, I would like to know if it's possible to add something in my .vimrc (or a plugin) that automatically backups all saving made to my files. Disk space is not an issue, I can delete these files after. I'm already using set backup set backupdir=~/.backup/vim set directory=~/.swap/vim This creates a myfile.extension~ in my .backup/vim. ...but I would like this configuration to add ~ to first save, ~0 to second, ~1 to third, ~2 to fourth, and so on - something that keeps copies from all modifications I made to a file. Is this possible? Do you know if there's a plugin for this?

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• Upgraded to Mountain Lion, now 127.0.0.1 is not resolving

  - by Shanimal

  I used to be able to type 127.0.0.1 (or my network IP 10.10.53.32) and it would resolve to my "default" virtual host. 127.0.0.1/~Shanimal and shanimal.dev both resolve to their appropriate folders. localhost and 127.0.0.1 give me a 404 - "Not Found The requested URL / was not found on this server." Basically, my "It works!" screen no longer works. /private/etc/apache2/Shanimal.conf: <Directory "/Users/Shanimal/Sites/_www"> Options Indexes Multiviews AllowOverride AuthConfig Limit Order allow,deny Allow from all </Directory> hosts: 127.0.0.1 localhost 127.0.0.1 shanimal.dev

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• Does multi-platter hard-drive use all of their heads to read simultaneously?

  - by WiSaGaN

  Suppose we have a harddisk with 2 platters with characteristics below: Rotational rate: 10, 000 RPM Avg sectors/track: 1000 Surfaces: 4 Sector size: 512 bytes I was reading "Computer Systems: A Programmer's Perspective 2ed" when I found that it calculates transfer time as if it only uses ONE head to read a sector. If that's the case, why not use 4 heads to write(read) on 4 surfaces? So when I write a 2K bytes file, each head should only need to wait for the platters to rotate just one sector length instead of 4, thus reducing the transfer time by a factor of 4. Or even redesign sector to make each sector on one cylinder but on 4 tracks residing same position respectively on 4 surfaces. Each one of (512/4) bytes. So when the hd needs to read a sector of 512 bytes, we only need the disk to rotate roughly 1/4 compare to original time. The idea looks like RAID 0.

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• Is it possible to analyze the size of a SubVersion repository?

  - by BrianH

  Is it possible to know how much disk space each project in a SubVersion repository is using? I can check out a working copy of each project and look at the size each project takes up, but I don't think that encompasses the total size of the project (all revisions). I can look under the "db" directory of the repository, but none of the files in there make sense - I don't think it is possible to use them to figure out how much space each project occupies. I tried the svn ls --verbose command, but the size that it gives me is just the size of the actual files in the head revision, I don't think it includes all revisions. Maybe this isn't possible, but I thought I would ask. Thanks in advance!

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• Snapshots are disappearing from Time Machine. Why?

  - by AntonAL

  I have TimeMachine enabled for my external HDD. I'm triggering backups manually 2 times per week. I have noticed, that some snapshots, that i made, are gone. I noticed this behaviour several weeks later, but i had doubts. To make it sure, i've recorded screen video with listing snapshots in TimeMachine. After watching my screen recording today, I'm sure, that for Augusut i had 9 snapshots. Now, i have only 3 of them. What's happening ? I had no crash disk reports, errors etc

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• Key is not detected in xev neither showkey -k in Ubuntu 10.04 in a Virtualbox VM.

  - by Somebody still uses you MS-DOS

  My question mark key in my keyboard isn't working. ("?"). I've tried to use xev and showkey -k to try to identify at least it's code and manually use xmodmap to mao this key. Unfortunately, the keys aren't being detected in neither utilities. I'm using Ubuntu 10.04 in a Virtual Machine, and my Kernel is 2.6.32-22-generic. What can this be? It's not a special multimedia key, it's a simple one. I would like to understand what exactly is happening so at least I can try to better debug this issue.

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• Windows XP occasionally hangs for 2-3 minutes as the splash screen fades in.

  - by marcusw

  This is a bit of a rare problem, I have not been able to debug or fix it or find anyone else with the issue. I hope someone here can help me out. Once in a while, I boot up Windows XP from the first partition of the first disk (using grub, the computer dual-boots ubuntu) and it hangs as the Windows XP splash image fades in, leaving the screen with a dim image of the splash screen. After 2-3 minutes, it continues to boot as normal, no error messages or strange behavior. I have noticed that this happens about 75% of the time when the last time the computer was shut down it was from Ubuntu, and maybe 5-10% of the time otherwise. I have looked at system logs as far as I was able, and did not find anything the miss. What is causing this and how can I fix it?

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• Restoring raid 5 array after bios flash

  - by cogergo

  I have just flashed my BIOS and now my machine does not detect my raid5 array! It has three 2TB drives in it so that is a LOT of data that will be lost! I have NOT deleted the array and it does not offer me to reboot I'm using Nvidia MediaShield! and Windows 7. Any ideas guys? Thanks! Update: here is the GUI raid configuration. As you see it shows one disk in the array but for some reason not the other two! Click for image of raid configuration error

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• Running suspicious X programs in GNU/Linux

  - by Vi

  What the most harmful thing can malware program started as separate limited user account do if it has access to the X server? Network and filesystem things are already considered by chroot and netfilter. It obviously can lock the screen and I will need to switch to other vt and kill it manually. Can it for example disrupt other GUI programs on the same X server (access to root terminal in nearby window)? I know that it is safer to run it in separate X server, for example, in Xtightvnc or even some virtual machine, but how dangerous is to just run it like other programs?

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• Preparing a hyper-v VM image

  - by Anteru

  We have a Hyper-V Windows Server 2k3, and we're hosting multiple VMs on it. However, right now, we always start the VM creation right on the server, i.e. when preparing a new Ubuntu image, I just install it into a new VM and set it up and when I'm happy we store the disk image. I wonder if there is a way to prepare a hyper-v image locally on my desktop machine instead? I'm running Windows 7, and I would love to be able to set up a VM so that we can copy the image over to the server and be done with it. This is for linux images only, and we definitely need the hyperv network integration. Is there a recommended way how to prepare hyperv images without running a hyperv instance somewhere?

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• Nightly backups (and maybe other tasks) causing server alerts

  - by J. Pablo Fernández

  I have two independent alert notification systems for my servers. The server is a virtual machine on Linode and one of the alerts comes from Linode. The other monitoring system we use is New Relic. They are both watching out for IO utilization. Every night I get alerts from both of them as the server is using too much IO. I run quite a few tasks in the middle of the night but the one I confirmed that can cause IO-warnings is running the backups. The backup is done by s3cmd sync. I tried ionice but it still generates the warnings. Getting warnings every night reduces the efficacy of warnings when they happen for real. For Linode I could raise the level at which a warning is issued, but it might mean making the whole thing useless as the level is too high. What would be the proper solution for this?

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