Ubuntu SSH X11 Forwarded Client Very Slow












4















Running SSH X forwarded session from my Ubuntu 12LTS client to a SLES server results in very slow(seconds per mouse click) GUI app(on the server) performance.



Using a windows client from the same LAN with Putty and XMing to SSH to the same server hosted application is blazing fast(instantaneous).



Likewise, SSH -X from other SLES machines to the same server hosted application is very fast.



I have tried numerous combinations of ssh parameters(listed below) with no effect on performance. The Ubuntu client is painfully slow while PuTTY/XMing are very fast.



-X
-C
-o GSSAPIAuthentication no
-c blowfish-cbc

UseDNS no -- on the servers sshd_config









share|improve this question

























  • Post a picture of your speedtest results here. I think it may be an internet issue with Ubuntu. Do one in Windows as well so we may compare the two.

    – Zzzach...
    Mar 26 '14 at 3:10













  • @user241527: Did you solve this problem in the mean time? I have a similar problem: I used to work remotely from my laptop to my desktop, running Ubuntu 12.04 and 10.04 respectively, and connected through my home network. After I have bought a new desktop and upgraded to 12.04, I can barely work remotely: sometimes a window will just freeze for half a minute or so.

    – Giorgio
    Apr 20 '14 at 16:05


















4















Running SSH X forwarded session from my Ubuntu 12LTS client to a SLES server results in very slow(seconds per mouse click) GUI app(on the server) performance.



Using a windows client from the same LAN with Putty and XMing to SSH to the same server hosted application is blazing fast(instantaneous).



Likewise, SSH -X from other SLES machines to the same server hosted application is very fast.



I have tried numerous combinations of ssh parameters(listed below) with no effect on performance. The Ubuntu client is painfully slow while PuTTY/XMing are very fast.



-X
-C
-o GSSAPIAuthentication no
-c blowfish-cbc

UseDNS no -- on the servers sshd_config









share|improve this question

























  • Post a picture of your speedtest results here. I think it may be an internet issue with Ubuntu. Do one in Windows as well so we may compare the two.

    – Zzzach...
    Mar 26 '14 at 3:10













  • @user241527: Did you solve this problem in the mean time? I have a similar problem: I used to work remotely from my laptop to my desktop, running Ubuntu 12.04 and 10.04 respectively, and connected through my home network. After I have bought a new desktop and upgraded to 12.04, I can barely work remotely: sometimes a window will just freeze for half a minute or so.

    – Giorgio
    Apr 20 '14 at 16:05
















4












4








4


1






Running SSH X forwarded session from my Ubuntu 12LTS client to a SLES server results in very slow(seconds per mouse click) GUI app(on the server) performance.



Using a windows client from the same LAN with Putty and XMing to SSH to the same server hosted application is blazing fast(instantaneous).



Likewise, SSH -X from other SLES machines to the same server hosted application is very fast.



I have tried numerous combinations of ssh parameters(listed below) with no effect on performance. The Ubuntu client is painfully slow while PuTTY/XMing are very fast.



-X
-C
-o GSSAPIAuthentication no
-c blowfish-cbc

UseDNS no -- on the servers sshd_config









share|improve this question
















Running SSH X forwarded session from my Ubuntu 12LTS client to a SLES server results in very slow(seconds per mouse click) GUI app(on the server) performance.



Using a windows client from the same LAN with Putty and XMing to SSH to the same server hosted application is blazing fast(instantaneous).



Likewise, SSH -X from other SLES machines to the same server hosted application is very fast.



I have tried numerous combinations of ssh parameters(listed below) with no effect on performance. The Ubuntu client is painfully slow while PuTTY/XMing are very fast.



-X
-C
-o GSSAPIAuthentication no
-c blowfish-cbc

UseDNS no -- on the servers sshd_config






12.04 ssh putty x11-forwarding






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 29 '14 at 23:22







user241527

















asked Jan 29 '14 at 22:28









user241527user241527

2113




2113













  • Post a picture of your speedtest results here. I think it may be an internet issue with Ubuntu. Do one in Windows as well so we may compare the two.

    – Zzzach...
    Mar 26 '14 at 3:10













  • @user241527: Did you solve this problem in the mean time? I have a similar problem: I used to work remotely from my laptop to my desktop, running Ubuntu 12.04 and 10.04 respectively, and connected through my home network. After I have bought a new desktop and upgraded to 12.04, I can barely work remotely: sometimes a window will just freeze for half a minute or so.

    – Giorgio
    Apr 20 '14 at 16:05





















  • Post a picture of your speedtest results here. I think it may be an internet issue with Ubuntu. Do one in Windows as well so we may compare the two.

    – Zzzach...
    Mar 26 '14 at 3:10













  • @user241527: Did you solve this problem in the mean time? I have a similar problem: I used to work remotely from my laptop to my desktop, running Ubuntu 12.04 and 10.04 respectively, and connected through my home network. After I have bought a new desktop and upgraded to 12.04, I can barely work remotely: sometimes a window will just freeze for half a minute or so.

    – Giorgio
    Apr 20 '14 at 16:05



















Post a picture of your speedtest results here. I think it may be an internet issue with Ubuntu. Do one in Windows as well so we may compare the two.

– Zzzach...
Mar 26 '14 at 3:10







Post a picture of your speedtest results here. I think it may be an internet issue with Ubuntu. Do one in Windows as well so we may compare the two.

– Zzzach...
Mar 26 '14 at 3:10















@user241527: Did you solve this problem in the mean time? I have a similar problem: I used to work remotely from my laptop to my desktop, running Ubuntu 12.04 and 10.04 respectively, and connected through my home network. After I have bought a new desktop and upgraded to 12.04, I can barely work remotely: sometimes a window will just freeze for half a minute or so.

– Giorgio
Apr 20 '14 at 16:05







@user241527: Did you solve this problem in the mean time? I have a similar problem: I used to work remotely from my laptop to my desktop, running Ubuntu 12.04 and 10.04 respectively, and connected through my home network. After I have bought a new desktop and upgraded to 12.04, I can barely work remotely: sometimes a window will just freeze for half a minute or so.

– Giorgio
Apr 20 '14 at 16:05












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XMing doesn't support the X11 security protocol, causing it to default to trusted forwarding. It's possible SLES has ForwardX11Trusted enabled, while Ubuntu doesn't. That option allows the remote X client to make trusted calls on the local X server, which is a security risk if you don't trust the server, but can provide a substantial performance boost if you do.



You can use ssh -Y to connect with trusted X11 forwarding or set the ForwardX11Trusted option in your ssh client config.






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    XMing doesn't support the X11 security protocol, causing it to default to trusted forwarding. It's possible SLES has ForwardX11Trusted enabled, while Ubuntu doesn't. That option allows the remote X client to make trusted calls on the local X server, which is a security risk if you don't trust the server, but can provide a substantial performance boost if you do.



    You can use ssh -Y to connect with trusted X11 forwarding or set the ForwardX11Trusted option in your ssh client config.






    share|improve this answer




























      0














      XMing doesn't support the X11 security protocol, causing it to default to trusted forwarding. It's possible SLES has ForwardX11Trusted enabled, while Ubuntu doesn't. That option allows the remote X client to make trusted calls on the local X server, which is a security risk if you don't trust the server, but can provide a substantial performance boost if you do.



      You can use ssh -Y to connect with trusted X11 forwarding or set the ForwardX11Trusted option in your ssh client config.






      share|improve this answer


























        0












        0








        0







        XMing doesn't support the X11 security protocol, causing it to default to trusted forwarding. It's possible SLES has ForwardX11Trusted enabled, while Ubuntu doesn't. That option allows the remote X client to make trusted calls on the local X server, which is a security risk if you don't trust the server, but can provide a substantial performance boost if you do.



        You can use ssh -Y to connect with trusted X11 forwarding or set the ForwardX11Trusted option in your ssh client config.






        share|improve this answer













        XMing doesn't support the X11 security protocol, causing it to default to trusted forwarding. It's possible SLES has ForwardX11Trusted enabled, while Ubuntu doesn't. That option allows the remote X client to make trusted calls on the local X server, which is a security risk if you don't trust the server, but can provide a substantial performance boost if you do.



        You can use ssh -Y to connect with trusted X11 forwarding or set the ForwardX11Trusted option in your ssh client config.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Apr 27 '14 at 2:35









        chizuchizu

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