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  • Why does my Windows 7 computer wake itself up from sleep mode?

    - by AbuHamzah
    I have XPS9100 DELL desktop computer awakes out of the sleep mode without me prompting it. I have 64 bit OS Before I go to sleep I put that in sleep mode but in the morning I see its awake and I try every setting possible but could not help I have tried this command and here is what I got and I am not sure what to do. C:\Users\NAME>powercfg -lastwake Wake History Count - 1 Wake History [0] Wake Source Count - 1 Wake Source [0] Type: Wake Timer Owner: [SERVICE] \Device\HarddiskVolume3\Windows\System32\svchost.exe (wuauserv)

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  • Determine hostname of connected ethernet switch

    - by Beastcraft
    I've a bonding on two interfaces. I'd like to monitor wether they are connected to different switches (the switches have hostnames). ethX should be connected to switchX and ethY to switchY. Currently I'm checking this with following command: tcpdump -vv -s0 -i ethX ether host 01:00:0c:cc:cc:cc After a minute it prints out the hostname (and much more information) from the switch. Are there any other solutions to monitor this? Greeting

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  • How to configure fetchmail to send messages from remote smtp server to Gmail?

    - by ifesdjeen
    I've been trying to setup email forwarding through fetchmail from remote smtp server to Gmail account, although messages are constantly coming to my local address and accessible via "mail" command. SMTP connection works perfectly, but emails do not go anywhere. System: debian, fetchmail Config: poll smtp.server protocol imap username “user” password “pass” smtpname “[email protected]” ssl Thank you!

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  • weird problem with bash

    - by Arcath
    I recently changed my .bashrc and tweaked how my PS1 looks, but now it has a very wierd problem, before the end of the line in terminal (about 2 3rds of the way in) it jumps back to the begining of the line like so: e before itarcath@Highgate][~/.gconf/apps/gedit-2/preferences] how long can a command b My first though was was that it wasnt getting the terminal size properly but tput cols returns the correct value. My.bashrc: http://github.com/Arcath/.Files/blob/master/dotfiles/.bashrc

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  • rdate for Windows 2008

    - by Lars D
    I need a command line tool that adjusts the time of a Windows 2008 server, using an internet clock. The purpose is to adjust the time in a script, when other apps from that script are not running. It is not an option to use the built-in NTP service because that makes some apps on this server fail - note, that this server is used in an industrial environment with no PCs on the network and no Windows update or similar applied. Any idea, anyone?

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  • Convert IP Address format from ForeFront Firewall logs with SQL

    - by TrevJen
    I am trying to query IP addresses from Forefront Firewall logs, and I am a little stuck on the IP formatting C0A8E008-FFFF-0000-0000-000000000000 Can anyone give me the MSSQL command to turn this into standard human redable? UPDATE, I now see that I kust need to convert the first 8 charecters from hex to decimal....which I can then convert to IP. the trick is to parse those first charecters from the field with SQL

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  • Windows Server 2003 port forwarding

    - by Vitor Braga
    Using the "netsh interface portproxy" I added a port forwarding to a Windows Server 2k3. The command "netsh interface portproxy show all" shows the added forwarding. On the other hand, any client connecting to the incoming port will receive a "connection refused" message. netstat also doesn't show the incoming port as listening. The machine firewall is disabled. There is any other way to setup port forwarding on Windows or debugging tips?

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  • How do I write code of more than 1 line in the Python interpreter?

    - by Sandro Dzneladze
    I have a problem coding Python in terminal. I'm just learning basics so I have no need to create .py files. In terminal I can run one line of code in the Python interpreter, but how do I write more than one line? Obviously if I hit enter, it enters the command and doesn't go down a line. I just want to test following in terminal: my_age = 35 my_eyes = 'Blue' print "my age is %d and my eye color is %s" % (my_age, my_eyes)

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  • script to su with password in script without root

    - by Triplell89
    I have scripted a process that involves updating symbolic links on files located on 3 different machines. On those machines exists 4 users each, who each need to have these links updated. Using su, is there a way to pass the password argument to the command on a single line, without invoking sudo as the users will not have admin rights? My only alternative solution at this point is to ssh around, however I would like to be able to do this without hardcoding in a bunch of hosts/ips.

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  • How do I crop an image in the Mac version of Microsoft Word?

    - by Bec
    I know how to do it in the Windows version of Word but I can't work out how in the Mac version. In Windows there's a crop tool where you can just drag to move the edges in to crop the image, how do I do that on the Mac? Also on the old version of Windows there was a command to delete the cropped sections of all images in a document to save file space, I can't find that in Word 2007 or Word for Mac.

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  • What does 'd' do in oh-my-zsh?

    - by ovatsug25
    I just downloaded oh-my-zsh and found out that 'd' has been taken over by some command I do not know. Does anybody know what the output from this is? 0 ~/Desktop/Dropbox/project_Sites/rails_app/app/views/static_pages 1 ~/Desktop/Dropbox/project_Sites/rails_app/app/views 2 ~/Desktop/Dropbox/project_Sites/rails_app 3 ~/Desktop/Dropbox/project_Sites 4 ~/Desktop/Dropbox 5 ~ 6 ~/.oh-my-zsh 7 ~/.oh-my-zsh/plugins 8 ~/.oh-my-zsh/plugins/rails 9 ~/.oh-my-zsh/lib

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  • Webcam error (libv4lconvert) while capturing VIDEO

    - by shadyabhi
    I get the following when I capture images using my web-cam.. libv4lconvert: Error decompressing JPEG: unknown huffman code: 0000ffff libv4lconvert: Error decompressing JPEG: unknown huffman code: 0000ffff libv4lconvert: Error decompressing JPEG: unknown huffman code: 0000ffff ...(same error repeating) ... I also had issue that my camera was not getting detected in ubuntu. So, in order to run an application that uses the webcam, I have to run a command like LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so ./6dofhand Whats causing these errors?

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  • Error with mounting partiotn ubuntu

    - by Master
    I have ext3 partition and i get this error mount: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so Command in fstab is /dev/sdb1 /media/Server ext3 defaults 0 0

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  • How to add Group in mounting drive in fstab

    - by Master
    I am using this to mount drive at startup /dev/sda5 /media/virtual ntfs defaults,umask=700,uid=1 0 0 This is working fine but i need things 1)By this method all the folders inside the virtual folder have same permissions but i want 700 for virtual directory and 777 for all other directories 2)I want that if i can add group as well in the mount command. Just like uid, if i couol add gid as well. Is it possible

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  • How do I prevent TCP connection freezes over an OpenVPN network?

    - by Jason R
    New details added at the end of this question; it's possible that I'm zeroing in on the cause. I have a UDP OpenVPN-based VPN set up in tap mode (I need tap because I need the VPN to pass multicast packets, which doesn't seem to be possible with tun networks) with a handful of clients across the Internet. I've been experiencing frequent TCP connection freezes over the VPN. That is, I will establish a TCP connection (e.g. an SSH connection, but other protocols have similar issues), and at some point during the session, it seems that traffic will cease being transmitted over that TCP session. This seems to be related to points at which large data transfers occur, such as if I execute an ls command in an SSH session, or if I cat a long log file. Some Google searches turn up a number of answers like this previous one on Server Fault, indicating that the likely culprit is an MTU issue: that during periods of high traffic, the VPN is trying to send packets that get dropped somewhere in the pipes between the VPN endpoints. The above-linked answer suggests using the following OpenVPN configuration settings to mitigate the problem: fragment 1400 mssfix This should limit the MTU used on the VPN to 1400 bytes and fix the TCP maximum segment size to prevent the generation of any packets larger than that. This seems to mitigate the problem a bit, but I still frequently see the freezes. I've tried a number of sizes as arguments to the fragment directive: 1200, 1000, 576, all with similar results. I can't think of any strange network topology between the two ends that could trigger such a problem: the VPN server is running on a pfSense machine connected directly to the Internet, and my client is also connected directly to the Internet at another location. One other strange piece of the puzzle: if I run the tracepath utility, then that seems to band-aid the problem. A sample run looks like: [~]$ tracepath -n 192.168.100.91 1: 192.168.100.90 0.039ms pmtu 1500 1: 192.168.100.91 40.823ms reached 1: 192.168.100.91 19.846ms reached Resume: pmtu 1500 hops 1 back 64 The above run is between two clients on the VPN: I initiated the trace from 192.168.100.90 to the destination of 192.168.100.91. Both clients were configured with fragment 1200; mssfix; in an attempt to limit the MTU used on the link. The above results would seem to suggest that tracepath was able to detect a path MTU of 1500 bytes between the two clients. I would assume that it would be somewhat smaller due to the fragmentation settings specified in the OpenVPN configuration. I found that result somewhat strange. Even stranger, however: if I have a TCP connection in the stalled state (e.g. an SSH session with a directory listing that froze in the middle), then executing the tracepath command shown above causes the connection to start up again! I can't figure out any reasonable explanation for why this would be the case, but I feel like this might be pointing toward a solution to ultimately eradicate the problem. Does anyone have any recommendations for other things to try? Edit: I've come back and looked at this a bit further, and have found only more confounding information: I set the OpenVPN connection to fragment at 1400 bytes, as shown above. Then, I connected to the VPN from across the Internet and used Wireshark to look at the UDP packets that were sent to the VPN server while the stall occurred. None were greater than the specified 1400 byte count, so the fragmentation seems to be functioning properly. To verify that even a 1400-byte MTU would be sufficient, I pinged the VPN server using the following (Linux) command: ping <host> -s 1450 -M do This (I believe) sends a 1450-byte packet with fragmentation disabled (I at least verified that it didn't work if I set it to an obviously-too-large value like 1600 bytes). These seem to work just fine; I get replies back from the host with no issue. So, maybe this isn't an MTU issue at all. I'm just confused as to what else it might be! Edit 2: The rabbit hole just keeps getting deeper: I've now isolated the problem a bit more. It seems to be related to the exact OS that the VPN client uses. I have successfully duplicated the problem on at least three Ubuntu machines (versions 12.04 through 13.04). I can reliably duplicate an SSH connection freeze within a minute or so by just cat-ing a large log file. However, if I do the same test using a CentOS 6 machine as a client, then I don't see the problem! I've tested using the exact same OpenVPN client version as I was using on the Ubuntu machines. I can cat log files for hours without seeing the connection freeze. This seems to provide some insight as to the ultimate cause, but I'm just not sure what that insight is. I have examined the traffic over the VPN using Wireshark. I'm not a TCP expert, so I'm not sure what to make of the gory details, but the gist is that at some point, a UDP packet gets dropped due to the limited bandwidth of the Internet link, causing TCP retransmissions inside the VPN tunnel. On the CentOS client, these retransmissions occur properly and things move on happily. At some point with the Ubuntu clients, though, the remote end starts retransmitting the same TCP segment over and over (with the transmit delay increasing between each retransmission). The client sends what looks like a valid TCP ACK to each retransmission, but the remote end still continues to transmit the same TCP segment periodically. This extends ad infinitum and the connection stalls. My question here would be: Does anyone have any recommendations for how to troubleshoot and/or determine the root cause of the TCP issue? It's as if the remote end isn't accepting the ACK messages sent by the VPN client. One common difference between the CentOS node and the various Ubuntu releases is that Ubuntu has a much more recent Linux kernel version (from 3.2 in Ubuntu 12.04 to 3.8 in 13.04). A pointer to some new kernel bug maybe? I'm assuming that if that were so, then I wouldn't be the only one experiencing the problem; I don't think this seems like a particularly exotic setup.

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  • How to rate-limit concurrent sessions with nginx or haproxy?

    - by bantic
    I'm currently using nginx to reverse-proxy requests from web clients that are doing long-polling to an upstream. Since we're doing long polling (as opposed to websockets), when a client connects it will make multiple http connections to the server in serial, re-establishing a connection every time the server sends it some data (or timing out and re-establishing if the server has nothing to say for 10 seconds). What I'd like to do is limit the number of concurrent web clients. Since the clients are constantly making new HTTP requests instead of keeping a single request open, it's a little tricky to count the total number of web clients (because it's not the same as total number of concurrently connected http clients). The method I've come up with is to track http requests by the originating IP address, and store the IP address somewhere with a TTL of 20 seconds. If a request comes in whose IP isn't recognized, then we check the total number of unexpired stored IP addresses; if that's less than the maximum then we allow this request through. And if a request comes in with an IP address that we can find in the look-up table that hasn't yet expired, then it is allowed through as well. All requests that are allowed through have their IPs added to the table (if not there before) and the TTL refreshed to 20 seconds again. I had actually whipped something together that worked correctly this way using nginx along with the Redis 2.0 Nginx Module (and the nginx lua module to simplify the conditional branching), using redis to store my IP addresses with a TTL (the SETEX command), and checking the table size with the DBSIZE command. This worked but the performance was horrible. nginx and redis ended up using lots of cpu and the machine could only handle a very small number of concurrent requests. The new stick-table and tracking counters that were added to Haproxy in version 1.5 (via a commission from serverfault) seem like they might be ideal to implement exactly this sort of rate limiting, because the stick-table can track IP addresses and automatically expire entries. However, I don't see an easy way to get a total count of the unexpired entries in the stick table, which would be necessary to know the number of connected web clients. I'm curious if anyone has any suggestions, for nginx or haproxy or even for something else not mentioned here that I haven't thought of yet.

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  • Ubuntu (9.1) behind a ISA proxy

    - by Dan
    I have set up a Ubuntu PC on a next work that is behind a ISA Proxy. When I run the command sudo apt-get update I get several messages with this message: 502 Proxy Error (The ISA Sever denied the specified Uniform Resource Locator) The computer can see the internet and adding the proxy settings in the Network Preferences does not help. When I do a ifconfig Im on a 192 address which is not the usual subnet our PCs are on. Any ideas?

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  • Gnome Desktop Environment install error

    - by Barbaros
    So i moved to a new server and i want to install gnome desktop environment to access my server via vnc viewer. But, i don't remember how i managed to install last time, so i tried yum groupinstall "GNOME Desktop Environment" command and server said Warning: Group GNOME Desktop Environment does not exist. No packages in any requested group available to install or update It's a brand new server so i didn't add any repos or else yet It's a centos 5.5 server ...

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  • Is there any way to execute something when closing the laptop's lid?

    - by Matias
    I'm wondering if there is any way to execute a program, run some command or anything else when closing the laptop's lid. My question aims to be generic, both for Windows and Linux. Something useful should be locking the laptop when closing the lid (Win + L in windows), or running expensive processes such as antivirus analysis etc. without doing it manually before closing the lid.

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  • Navicat 8/9 crashes my Debian/Linux

    - by meder
    I run Debian 5 + Gnome and it seems that after I made certain updates with aptitude, whenever I run a query in Navicat ( sql program that runs on WINE ), as the results are being presented linux goes into the command line and the GUI dies and it restarts and it asks me to login again ( all my programs crash ). Has anyone experienced this before? Or does anyone have a clue as to how I could go about debugging this? I suspect it's some issue with Gnome and WINE, but I'm not sure.

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