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• Iptables: masquarading and routing

  - by nixnotwin

  I have a WAN router which is linked to isp over a /30 WAN subnet. But it also servers as a router to a /29 local public WAN subnet which is connected to few of my servers. The traffic from /29 gets routed to ISP via /30 subnet. For a wired reason I want to masqarade (NAT) the interface which has /30 ip. So the interface with /30 ip should appear as masquaraded for my 192.168.1.0/24 network and it also should act as a normal non-NAT router for my WAN public subnet /29. Can this be done with iptables on a Linux machine?

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• Apache: serving SSL only

  - by elect

  I have a website that I want to be access only by https://myurl.com. A normal typing myurl.com should be forwarded to the https. I tried different things such as: RewriteEngine On RewriteCond %{SERVER_PORT} 80 RewriteRule ^(.*)$ https://myurl.com/$1 [R,L] (rewrite mod ON) or NameVirtualHost *:80 <VirtualHost *:80> ServerName mysite.example.com DocumentRoot /usr/local/apache2/htdocs Redirect permanent /secure https://mysite.example.com/secure </VirtualHost> But they didnt work, which is the right way to do it? Debian & Apache 2

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• How can I pin point a USB file transfer bottleneck in Unix?

  - by HankHendrix

  I'm experiencing very slow data transfer speeds over USB 2.0 on my nix box and was wondering how I can pin-point the cause of the problem. I've looked into iotop and top but the cpu and mem figures look normal (compared to guides I have checked). The box which is affected is Ubuntu 12.04 32bit Server running on an Asus EEE 701 2G model and I am transferring from the OS over USB 2.0 to an external HDD (which transfers at 30MB/s+ on Windows 7 on other machine). I get rsync write speeds of 1MB/s from OS to USB HDD which seems ridiculously slow. These speeds are consistent with other USB HDDs and sticks.

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• Server freeze restarted quickly so how do I fiond what went wrong?

  - by Charlie

  I have a SQL SERVER DB running on a windows server 2008 (VMWare) Yesterday I could not RDP to it so I ended some RDP sessions which were left logged in. This seemed to solve the problem. However last night I learned that the DB was inaccessible and unresponsive to customers. My colleague checked the server but again is unable to create an RDP connection. He then restarted the server and since it has been fine. Looking at the CPU Readings of the Server it spiked up to 100% before the original RDP problem .After I ended the extra seeions uit again dropped down to normal levels however before the time of the customer complaint it had rose to 100% again - before it had to be restarted. Is there anyway I can investigate which processes may have caused the problem in the first place. Would there be some kind of memory dump from when it was restarted. I would prefer to find out what is wrong now instead of waiting until it happens again.

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• Windows 7 RDP Fullscreen mode

  - by kubal5003

  I have a problem with remote desktop connection in Windows 7. When I connect to remote computer I would like to switch to fullscreen like I did in previous versions - just by clicking maximize. When I was in fullscreen mode and I moved the mouse to the upper border of the screen a nice bar appeared and I could minimize rdp or close it. In Windows seven when I click on the maximize button the window maximizes like a normal window - menu start/taskbar(whatever you call it) is still visible and because the resolution of the rdp client desktop is set like on the computer that I'm using it's not fully visible and scrollbars appear. That's really annoying. Can anyone tell me what to do? Is it a bug or maybe there is a "magic shortcut" that is poorly documented and does the trick? (I was trying to find it myself first ofcoz, but no result)

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• Creating a command that compress a file and save it on a usb, but cannot detect the usb in linux.

  - by Lance

  First of all I can't detect the USB on linux using the command line. I check the directory dev and still cannot find the usb. used the df command to check the usb. I plug and typed df and then unplug and typed df again and nothing changed. We are using a server(telnet) to use the command line of linux on a windows 7 OS. The second problem I have is how can I execute the bash script that I have made. It seems that I cant put my .sh file in /usr/bin/ I would like to make my command executable in all directories like a normal command. Sorry, im still newbie at this things. This is what I get on staying on Windows too much. Sorry for my english. Thank you in advance.

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• Hardware VPN suddenly slow, even after replacement. Free software VPN speed is fast [closed]

  - by Andrew

  In our company we have two remote users, one in Northern California and one in Texas, that connect via VPN. We have a hardware SSL VPN unit, and suddenly this week they experienced massive slowdown, to the point of speedtesting at 0.5 mbps when it is normally 7-10mbps. We replaced the hardware sslvpn but that did not solve the problem. If I have them connect using a free VPN tool like TeamViewer, their speeds are back to normal. Does anyone have any idea why this could happen? We have not made any infrastructure changes so this was very out of the blue and I'm confused as to why even replacing the hardware vpn didn't fix it, if using free software works just fine.

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• Tools for tracking disk usage

  - by Carey

  I manage a number of linux fileservers. These all run applications written from 0-10 years ago. As sometimes happens, a machine will come close to, or run out of disk space. Reasons include applications not rotating log files, a machine with 500GB of disk producing 150GB of new files every month that were not written to tape, databases gradually increasing in size, people doing silly things...generally a bit of chaos. Anyway, when a machine unexpectedly goes from 50% to 100% full in a couple of hours, I figure out what broke (lots of "du") and delete files or contact someone. I also can look at cacti graphs to figure out what the machine's normal disk usage is (e.g. for /home). Does anyone know of any tools that will give finer grained information on historial usage than a cacti/RRD graph? Like "/home/abc/xyz increased 50GB in the last day".

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• Hardware question re Hauppauge WinTV-HVR 900 HD video/tv capture unit used with laptop with HDMI output laptop HDMI connection

  - by Bill

  I've ordered a Hauppauge WinTV-HVR 900 HD video/tv capture unit. It is mainly for use with my HP desktop running Windows 7 Professional, but I will want to use it occasionally with my partner's HP laptop running Vista Home Premium. The latter has an HDMI output which works perfectly with my LG 42" LCD TV, enabling display of BBC iPlayer and other catchup services. Will the live or recorded HD signal from the WinTV-HVR 900 HD connected to the laptop's USB input be output on the laptop's HDMI socket as HD? Come to that, will SD content be output? The reason I ask is that I had a problem with a Pinnacle unit which displayed OK on the laptop's screen but not on the TV screen (which did display all the normal Windows material). I've tried the Hauppage website, but it doesn't even acknowledge the existence of the WinTV-HVR 900 HD!

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• Firefox Wordwrap

  - by AtlantaBill

  The text displayed in several, forum sites that I frequently visit does not automatically word wrap in Firefox's window. Rather, it just "runs off" the right end of the window. I can cause the text to properly word-wrap by maximizing the window and then immediately returning it to its normal size. This lasts until I move to another page and then I have to repeat this "work-around" to display word-wrapped text properly again. Anyone have any ideas on what I can do to make Firefox always automatically word-wrap text? TIA. Bill

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• Possible causes for Domain server being unavailable?

  - by serversurfer

  One of our servers was compromised after a user with administrative privileges accidentally loaded a virus from a USB drive on a desktop connected to the domain. The two most obvious symptoms of this were: The server is no longer responding to login attempts The root directory of the drive containing user data has been filled with randomly named empty folders. (Initially it was around a million folders, I've been slowly deleting them.) I've run several virus scans from different vendors and am fairly confident the virus has been removed but the damage is done. I'm hoping the two symptoms are related and that once the directories are gone the server will start responding again. The drive is very slow to respond. I'm deleting about 20k folders at a time. Anymore than that and windows explorer becomes unresponsive. In the event that I finish cleaning up the HD and things don't return to normal what other things can I check?

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• Upgrade from "audit mode" (pre-cloning) Windows 8 to Windows 8.1?

  - by Display Name

  I have a Windows 8 in audit mode with a lot of applications installed, custom configurations done, and an answer file prepared, ready to be sysprepped for cloning. How do I upgrade to Windows 8.1, when I can't go into the store (Metro apps don't work in audit mode)? If I run sysprep then create a normal account so I can get the upgrade from the store, I suppose there's no way to go back to audit mode, and that's a huge problem as I want to retain the particular account settings I have configured for the audit mode account as a default account. What do I do??

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• Nvidia 8600 GT drivers Will not run setup

  - by Zeno

  I am attempting to upgrade my video card drivers with my nvidia 8600 gt. I downloaded the drivers from NVIDIA and when I run the setup, nothing happens. It does appear in the Processes, but never does anything. I've tried restarting, tried killing the process and re-running, I am an admin account... nothing works. What is wrong? [EDIT] The installer does run, it extracts the setup files to C:\NVIDIA as normal then when it tries to run that setup to do the actual install, nothing happens (the process does show up in Task Manager and just sits there). Attempting to run the installer manually via C:\NVIDIA\DisplayDriver\296.10\WinXP\English\Setup.exe has the process open, but nothing happens. This machine is WinXP 32bit.

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• rsync --link-dest behaviour when run as sudo

  - by fotNelton

  In order to create regular backups, I'm using rsync together with --link-dest so as to create hard-links for unchanged files. For example: rsync -ax \ --partial --delete --delete-excluded --inplace \ --exclude-from=/tmp/temp_excludes \ --link-dest=/Volumes/Backup/current \ /Users /Volumes/Backup/2012-06-25 This works very well as long as I start the process from my normal user account. Though as soon as I start the process using sudo it behaves erradically, meaning that rsync copies all the unchanged files instead of hard-linking them. Since sudo modifies the environment, I've already also tried sudo -E in conjunction with making sure that my sudoers file has the corresponding option set. Well, that didn't work either. So, the question is, how can I run rsync using sudo? Whereas the above example only shows a backup of the Users directory, I also need to backup some system files that I can only access as root.

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• sql server express

  - by neil

  I use MS Acess as the front end. Loaded SQL Server 2008 R2 on my laptop. On my laptop (which I want to run the sql/access locally), there is no drop down listing. Under my normal Network (Sql 2000 enterprise edition) condition, the server name is part of the drop down listing. Finally got an ODBC positive test by manually listing in the system dns ODBC connection 'computername\sqlexpress'. Nonetheless, can not get an ODBC connection from Access. How can I get it working?

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• Make words look like keystrokes in Microsoft Word

  - by techturtle

  Is there an easy way in Microsoft Word 2010 to make words appear like keystrokes the way we can here in Superuser? Something like this: Ctrl + V I know that <kbd> is an HTML tag, but in normal HTML that just switches to a fixed-width font. In fact, that's how Word treats it if you paste something from SU into a Word doc: If there's not a standard way to do this in Word, is there a free font that might accomplish the same thing? I thought I'd seen some before but couldn't find any at the regular places I find fonts (dafont.com, fontspace.com).

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• I try to access a NFS mount via FTP. It works but the FTP Dir listing is very slow

  - by W0bble

  I mount an NFS using this command: mount -o rsize=8192,wsize=8192,timeo=14,intr serverip:/directory /mnt/directory However the mount appears on the client as expected a cmd like "ls -a" work pretty fast on the nfs mount. But when I try to list the mounted directory via FTP it gets very very slow ( 1.250 bytes in 160,39s (0,01KB/s) ). But surprisingly downloading files via FTP from nfs work with normal speeds. I tested several values for rsize and wsize parameter with no success. Both client and server are running Debian squeeze and NFSv4

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• Uncorrectable machine check

  - by GregC

  I am experiencing rare but real unrecoverable machine checks on HP DL370 G6 dual-core Xeon server. I ran memtest86+ before, and ran CPU-intensive operations without any problems. In your opinion, does this indicate a real problem, or is it normal and expected behavior? How would you approach this problem? EDIT after some troubleshooting, it seems that these machine checks, as well as problems when showing device manager can be traced back to NC375i NICs. All is well when the NICs are not in the server. Further improvements to stability of HP Gen6 with Intel Xeon have been brought in with BIOS update in September 2013 HP Update DVD. Intel's newer microcode makes these CPUs much more stable. We haven't seen hardware-related BSODs since the update in September.

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• cPanel IPTables custom rules

  - by James Haigh

  Hi, I'm trying to allow a host access to port 3306 by IP. I've added the rule and ran an iptables-save and also service iptables save. These commands show as "OK" with no reported errors. And this works absolutely fine. Now, the server hasn't been restarted at all since I've been having this problem, but every day when I start developing on the server that needs mySQL access, it reports that the connection is refused. Back on the mySQL server, all I need to do is service iptables restart and everything then works as normal. The mySQL server is a CentOS cPanel VPS running on OpenVZ. Anyone know how I can make these rules persist? Is it something cPanel is doing overnight that is messing with my config? Thanks.

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• Lost Linux root password - Recovery mode and init=/bin/bash fail

  - by Albeit

  I lost/forgot the root password to a server sitting beside me and am trying to reset it. I would rather not have to wipe and re-install or use a Live CD (server is running Ubuntu Server 12.04). What I've tried so far... 1) Boot into "Recovery mode" from Grub2 boot menu then drop into root shell prompt. I am prompted to "Give root password for maintenance". No-go. 2) Change the boot parameters for the main boot option to include "rw" and "init=/bin/bash". When I then boot with Ctrl-X, the screen goes black, and nothing happens (I've waited five minutes). init=/bin/sh and init=/bin/static-sh both do the same thing, while init=/sbin/init boots as normal. Is there anything else I can try to reset the root password? Thank you!

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• Certain websites won't load with DHCP server

  - by Simon E

  Hi, I recently configured a server using Windows Server 2008 to take over from my router using DHCP Server. I disabled my router from assigning IPs too. All works well, except for certain sites that refuse to load e.g. "Firefox could not find www.amazon.co.uk" http://www.google.co.uk/ http://www.amazon.co.uk/ http://www.jobsite.co.uk/ I think it may have something to do with co.uk domain. If I reboot the server everything goes back to normal but of course thats not a good solution to do that every other day. Does anyone know of this problem or what it might be - I am very new to server technology.

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• Bay Speaker Panel Installation

  - by JordanD

  I purchased a bay speaker panel that has a molex connector and a sound connector. Do I need to run the sound connector through my tower and somehow out the back into the IO panel? Or is there supposed to be a place on my motherboard for it to connect to? This is a replacement for normal desktop speakers for me to save desk space. Edit: Is there an adapter for the sound cable to the mother board? If so; what is it called? Thanks

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• Does nginx auth_basic work over HTTPS?

  - by monde_

  I've been trying to setup a password protected directory in a SSL website as follows: /etc/nginx/sites-available/default server { listen 443: ssl on; ssl_certificate /usr/certs/server.crt; ssl_certificate_key /usr/certs/server.key; server_name server1.example.com; root /var/www/example.com/htdocs/; index index.html; location /secure/ { auth_basic "Restricted"; auth_basic_user_file /var/www/example.com/.htpasswd; } } The problem is when I try to access the URL https://server1.example.com/secure/, I get a "404: Not Found" error page. My error.log shows the following error: 011/11/26 03:09:06 [error] 10913#0: *1 no user/password was provided for basic authentication, client: 192.168.0.24, server: server1.example.com, request: "GET /secure/ HTTP/1.1", host: "server1.example.com" However, I was able to setup password protected directories for a normal HTTP virtual host without any problems. Is it a problem with the config or something else?

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• High CPU Steal percentage on Amazon EC2 Instance

  - by Aditya Patawari

  I am experiencing high CPU steal percentage in a Amazon EC2 large instance. I know it means that my virtual CPU is waiting on the real CPU of the machine for time. My question is that what can I do to reduce this percentage and get maximum out of the CPU? Steal percentage is consistently at 20%. System load crosses 10 when this happens. I have checked memory and network and I am sure that they are not the bottleneck. Is that normal for such environment? Also are there any system level optimization techniques for reducing steal percentage form the virtual instance? avg-cpu: %user %nice %system %iowait %steal %idle 52.38 0.00 8.23 0.00 21.21 18.18

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• Amazon EC2 Sign In

  - by Barry

  When I change the home directory of my Amazon EC2 instance from /home/ubuntu to /home/ubuntu/folder in the /etc/passwd file, I am no longer able to access the instance using my existing keypair. Once I switch it back to the original directory I have no problems and can log into my instance as normal. I have checked the permissions on the new folder and they are drwxr-xr-x, which is the same the /home/ubuntu folder. I have a number of instances running at the minute and because of this change I have no way of logging back into them to rectify the situation. Does anyone have an idea what is going on? Thanks in advance

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