[SOLVED] Keypress in SSH not sent immediately unless reloading webpage

eric · 2015-05-16 15:30:27

Since a month or so, I have a VPS-server that I use as my own private cloud server.
I use SSH to connect to this server for shell access and file transfers (sftp and scp).

Sometimes a keypress on the local keyboard takes a long time before it is sent to the server and become visible on the local display (the console or a window on the desktop). In the worst situation this can even take longer than 20 seconds.
The same happens when transferring files. Sometimes a file takes a very long time before it is transferred.

I've noticed that when this happens, reloading a webpage once or twice helps. The webpage doesn't have to be on the same server as the one SSH is connected to. Yes, it was me who generated a lot of pageviews on Archlinux' Wiki
It looks as if my computer, router of maybe the wifi-module is temporary blocking the SSH-traffic waiting for more traffic.
The SSH-connection is also not disconnected, because I am not asked to reauthenticate with a password and/or public key.

The trick I'm using now (and which works well), is listening to an online radio station while I'm doing something through an SSH-connection to this server.
This is of course a workaround and I'm looking for a real solution.

Last edited by eric (2015-05-24 00:22:48)

x33a · 2015-05-16 16:12:37

Do you have ssh access to some other server? If yes, then see if the behaviour can be replicated there. Alternatively, try accessing a machine on your LAN using ssh.

eric · 2015-05-23 13:52:26

x33a wrote:

Do you have ssh access to some other server? If yes, then see if the behaviour can be replicated there. Alternatively, try accessing a machine on your LAN using ssh.

I see the same issue after opening an SSH-connection to my Android phone connected to the same home router. Also downloading a 22MB file to the phone from the desktop is slow or will stall after 20% or so.

After some trial and error, it turned out that some bitrates were causing the slow or stalling download and probably also the SSH-issue of the first posting. I have set the WiFi-connection of the desktop computer to only use the good bitrates with the command

iw wlan0 set bitrates legacy-2.4 [bitrates]

(using 'iwconfig wlan0 rate [bitrate] fixed' may also be possible) and have not see this SSH-issue since.

So it looks like a WiFi-issue (instead of an SSH-issue) during downloads from my computer. I probably never noticed this issue because if I download it's almost always downloading TO my computer.

Thanks for the help

Last edited by eric (2015-05-23 14:06:40)

WorMzy · 2015-05-23 14:33:53

Please don't use "CLOSED" in the topic title -- this is used when a topic is locked. Use "SOLVED" instead.

Arch Linux

#1 2015-05-16 15:30:27

[SOLVED] Keypress in SSH not sent immediately unless reloading webpage

#2 2015-05-16 16:12:37

Re: [SOLVED] Keypress in SSH not sent immediately unless reloading webpage

#3 2015-05-23 13:52:26

Re: [SOLVED] Keypress in SSH not sent immediately unless reloading webpage

#4 2015-05-23 14:33:53

Re: [SOLVED] Keypress in SSH not sent immediately unless reloading webpage

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