Ubuntu :: X Windows - How To Listen On TCP Port
Feb 6, 2011
It appears that X Windows under Ubuntu (or Gnome?) is started to listen to a Unix named socket, instead of a TCP port number, for client connections. That's what SSH is forwarding when it does X forwarding. I need to start X applications on a remote machine, and then close the SSH connection. So I need to make the connections directly. This is within a LAN on private IPs, so security is not an issue. I searched on help.ubuntu, but there appears to be no particular document that covers this. Anyone know where this is configured to enable it to listen on a TCP port like the usual 6000?
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Aug 7, 2010
When I use the following command:
ssh user@ssh_server -L 5500:localhost:5500 -p 22
everything works fine. I can log in, and local port forwarding is done. Otherwise when I use the command:
ssh user@ssh_server -R 5500:localhost:5500 -p 22
I get an error "remote port forwarding failed for listen port 5500". However when I try remote port forwarding in WinXP by use of putty there is no problem...
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Jul 20, 2010
I tried to make "ssh tunneling", but failed and got this message.
Quote:
Administrator@windstory-PC /
$ ssh -R 7869:localhost:7869 windowsstudy@192.168.0.4
windowsstudy@192.168.0.4's password:
Warning: remote port forwarding failed for listen port 7869 Last login: Wed Jul 21 01:56:04 2010 from 192.168.0.2 -bash-3.2$
1. system environment
192.168.0.2 - windows 7 + copssh
192.168.0.4 - centos 5.4 x86 + openssh
2. Guide for setting "ssh tunneling"
[URL]
3. Added this to sshd.conf
Quote:
AllowTcpForwarding yes
4. "netstat -na|grep 7869" at 192.168.0.4
Quote:
[root:maestro:~]# netstat -na|grep 7869
tcp 0 0 0.0.0.0:7869 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:7869 127.0.0.1:53539 ESTABLISHED
[code]....
5. result of "ssh -vvv -R 7869:localhost:7869 windowsstudy@192.168.0.4"
Quote:
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
[code]....
6. I added 7869 for telnet service as follow;
Quote:
mytelnet 7869/tcp # My Telnet server
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Feb 12, 2009
I make an application on GNU/Linux which listening on a MULTICAST stream, so I open my unconnected socket, bind it on a MULTICAST address and a port, join the multicast group with the "setsockopt (IP_ADD_MEMBERSHIP)", then I receive datagram on my socket.
Now I've two different instances of the same application that run with their own MULTICAST address and port. And what I found strange is that, after a misconfiguration, I switch the ports, for example:
Emitting on 225.0.0.1/23451 and 225.0.0.2/23452
Receiving on 225.0.0.1/23452 and 225.0.0.2/23451
And my receiving part doesn't care about the MULTICAST address, it looks like the socket is listening on the port number only! I mean that the receiver [225.0.0.1/23452] take its datagrams from emitter [225.0.0.2/23452] and vice-versa!
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May 23, 2010
I'm running Ubuntu 9.10, and am trying to get proftpd to listen on a port other than 22. I've modified the proftpd.conf file, as well as adding the desired port to my /etc/services file, yet if I try anything other than port 22, the connection is refused.
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Jan 16, 2011
I just installed KVM on a new system and just found out the hard way that virt-manager cannot be installed on the same machine because of a library conflict, so I will have to manage my VMs from another machine. I will use a SSH tunnel to forward the port, but I don't know what it is. Also, how do I start KVM?
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Dec 30, 2010
I wish to use the VNC server built in to the Ubuntu to easily access it from other computers on my local network. I need to skew the VNC Server port off of the normal 5900 to something else because I am using VNC to access several computers (sometimes simultaneously) so each VNC server needs to be set with a different port #. At this point it is all local subnet connections with no incoming internet access and I am not worried about security.
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Apr 16, 2011
I would like to listen to a virtual serialport (dev/ttyACM0). I heard you can this with the terminal in Linux. But how? Does anyone know some commands?
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Aug 20, 2009
Can't seem to access my squid server on port 80. I have port 80 allowed in the conf for this IP. apache is listening to port 80 but only on the 2nd IP. iptables is allowing through port 80 incoming nmap shows no ports open on 80 though:
Code:
Starting Nmap 5.00 ( http://nmap.org ) at 2009-08-20 11:19 BST
NSE: Loaded 0 scripts for scanning.
Initiating SYN Stealth Scan at 11:19
[code]....
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Apr 14, 2010
I've killed apache via /etc/init.d/apache2 stop, but something is still listening on port 80:
Code:
root@www:/etc/apache2/sites-enabled# netstat -an | grep LISTEN | grep 80
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:8022 0.0.0.0:* LISTEN
unix 2 [ ACC ] STREAM LISTENING 5806 /var/run/mysqld/mysqld.sock
How do I find out that program this is?, or how to I stop it listening?
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Jan 30, 2010
I tried searching and tried different things and have failed miserably. What I am trying to accomplish is have postfix listen on port 587. I have read that I should do this using Linux Firewall rules as to not mess with postfix config. Here's what I have in my ip6tables.
Code:
iptables -t nat -A PREROUTING -p tcp --dport 587 -j REDIRECT --to-ports 25 However, when I restart ip6tables I get unknown arg --to-ports
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Apr 6, 2010
How can I set my server to listen at a different port for http access. I would like to use port 8080 (to circumnavigate isp blocks). Also can I do the same thing for sftp connections?
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Aug 29, 2010
On Fedora 13 is there anywhere else on the system that I have to change to get Apache to Listen to an assigned port, something other than 80. Suppose for instance I wanted Apache to Listen on port 94. I told by the site that their router is forwarding apache to port 94. That doesn't mean I change the Listen in httpd.conf. correct. Apache is still expecting connection on port 80 but in this case 80 then gets forwarded in the router to 94. This is my understanding.
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Mar 1, 2010
I was just wondering what I have to edit in order to get Maia Mailguard to listen on port 443 instead of port 80
right now I am logging on with [URL] but I would like to connect to [URL]
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Feb 21, 2010
I'm using OpenSuse 11.2 64 bits When I try to listen to music in Grooveshark Grooveshark - Listen to Free Music Online - Internet Radio - Free MP3 Streaming I can listen fine, and it seems to work ok, when suddenly the sound of the website stops to work, my processor gets overload and I've to reopen the site to continue to listen. I get the following message in kernel (I'm no sure if it's related)
[ 3402.591674] ide-cd driver 5.00
[ 3402.622010] ide-gd driver 1.18
[ 3402.691580] st: Version 20081215, fixed bufsize 32768, s/g segs 256
[ 3404.308048] end_request: I/O error, dev fd0, sector 0
Some Hardware Info:
[Code]...
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Feb 18, 2010
I want to do a simple port redirect, i.e. whatever comes trough whatever interface on port AAAA will get redirected to port BBBBI thought that iptables -t nat -I PREROUTING --source 0/0 --destination 0/0 -p tcp --dport AAAA -j REDIRECT --to-ports BBBBhowever it doesn't work, e.g. nc -v -w2 -z localhost AAAA gives:
nc: connect to localhost port AAAA (tcp) failed: Connection refused
while
nc -v -w2 -z localhost BBBB
[code]....
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May 2, 2010
I have a mail server i need it to send message via port 587 not port 25, i make some changes to my postfix server which i use and it is already successed making a telnet to 587 port like it :
[Code]....
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Aug 12, 2010
I have recently bought a new computer, and would like to take my existing RAID-1 from the old computer to the new computer, as the disks hold many digital photos. The old RAID-1 was in a DELL XPS 400 (and based on the intel 82801GR chip I guess), and the new computer has an intel ICH10R. I understand that both chips require a Windows driver if RAID-1 is needed.
The old disks still reside in the "dead" computer. How can I proceed? I hope the solution is that fakeRAID can be enabled, but I would like to ask the clever and experienced community before I do something that cannot be undone (and maybe lose all my digital photos!). Or maybe you have a better solution?
If you need more information to help me then please tell me to post information; I do not really know much about setting up RAID-1.
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Apr 5, 2011
I am trying to use one serial port simultaniously for two different programs. I have a two programs that use GPS information that I would like to run at the same time. At this time only one program at a time can access a serial port. I have found a way to emulate this in Windows so that I can have both running, now I'm trying to do the same in Ubuntu. Is it possible? If yes, How? The GPS receiver is connected via a USB port.
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May 1, 2010
I have some legitimate business needs for the U1 Windows client port. Is there an ETA for this project completion?
Also, I have a personal need for management of the Favorites synching via the web management interface. When will this be rolled out?
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Jun 27, 2010
i installed windows xp last night on vbox useing ubuntu 1004 as the host os
i went to try to open a port for winmx 2.6 and its timeing out so i looked @ the ip and its completely diffrent from my host os ip so how would i allow out going connections in windows xp running under vbox
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Sep 1, 2011
I have a need to displace a serial port from one Linux computer to another computer running Windows (XP.) I am running Heyu on a Linux machine in a closet. The power leg for that circuit cannot let the X10 communication reach most of the rest of the house. Where it does work, is from my office but there I am running XP computers only.
I would like to plug the CM11A into my XP computer, share it's serial port and have the home automation computer (running Heyu and Linux) use the LAN to get to the XP serial port without Heyu knowing it is not a local port. Has anyone done this? Can I share a serial port in XP? Can I get Linux to map a serial port to a virtual one on another machine?
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Jun 23, 2010
I'm using ubuntu 9.04; I have a large project in windows that I want to "port" it in linux.
It uses IPC mechanism "Shared memory" and also "Critical Section" APIs in windows, but unfortunately I have no good reference to change these windows APIs to their equivalent in linux?
Is there a comprehensive documentation or reference for this issues? I mean a table containing the equivalent APIs or systemcalls in windows and linux! For example, what's an alternative for the "InitializeCriticalSection" API in linux? Or an alternative for "CRITICAL_SECTION" structure? Or even an alternative for "RegOpenKeyEx", although we don't have registry in linux!!
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Jan 28, 2010
1.- What would be the simplest way to port and handle tarballs downloaded in windows, to a CentOS 5.4 based system (Elastix in fact), but without graphic mode (that is, using only the CLI)? The system has network contection, usb interfaces and a working DVD-RW attached.
2.- If the answer is Samba, how I get Samba working on my system?
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Aug 3, 2010
I'm using avidemux for Windows platform. I realize this is linux software but I guess I thought some of you OSS developers might know something about the bugs in the windows port (I can't seem to find an answer in tutorials or faq's). I load my mpeg. I apply the filters which only show in preview, not in the mpeg that I'm staring at in the main window. I ensured encoding was correct for audio and video, placed the "proposed" I guess you can say, jobs in the job list but when I go to run the selected job, avidemux crashes. It erases all my filters and such (which you can imagine how annoying that is for really crappy video). I've searched through the interface for an apply button, pressed all the configure buttons so I assume that the processing stage occurs when I perform the job. (Sadly the faqs and tutorials aren't very well worded although they say much about features, they don't elaborate too tough).
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Jan 8, 2009
I bought a set of 3 laser sensors and it came with a software and its C++ source code for windows to receive the lasers info through the serial port. Since the entire project is running on Linux, I need to port the windows code to Linux. At the present moment, I already can receive the data from each of the 3 sensors, but the info is coming concatenated! Tracking down the original windows code, I found that it is probably happening cause I didn't ported these lines to my Linux version:
Code:
COMMTIMEOUTS CommTimeouts;
[...]
CommTimeouts.ReadIntervalTimeout = 2;
[code]....
I've searched already about how to specify the serial port timeouts on Linux, but didn't find a solution. how to port these lines to Linux or maybe where to find more info about how to set serial port timeouts on Linux?
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Mar 31, 2011
I am trying to connect an ipad to a windows xp virtual machine running in a linux (opensuse) host machine. VMWare reports that usbmuxd running on the host machine (opensuse) must first release the usb port so that vmware can open it in the guest (XP) vm. VMWare knows that I have physically connected an ipad and when I click "Connect" reports the error and then displays the port as "Connected" although according to ITunes diagnostics there is no such connection. I have the same problem connecting a usb flash drive to the guest vm. Is there a way I can manually disconnect the port from the opensuse host?
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Jun 2, 2010
Linux machine is running a webcam. I export my webcam with fswebcam for the moment on a ftp and ssh, but it is so slow.
I wanna stream it, how can I make it and make it simple for the friends ?
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Feb 21, 2010
what does beam.smp listen for? says that beam.smp is listening, I was wondering why this process needs to listen?
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Jul 24, 2010
I went on radio's web site to listen to it when i hit the link to listen to i get an error saying i don't have the required plugin and an option to search. I searched and i got this message
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