connecting with ssh to winswitch server is failing.

[Kundan Kumar]

While winswitch client is trying to connect to some other winswitch server through m_DNS. It is failing to connect through ssh. Through Direct connection it succeeds. But, opening a remote application, doesn't shows on the requesting host.

I am running latest winswitch version 0.12.21, with xpra version 0.16.1. My both host system where connection is expected, is Ubuntu 15.04. I have also seen this issue in Ubuntu 15.10.

I tried to run the winswitch_applet in debug mode. Attaching a screenshot for the same.

[Kundan Kumar]

Screenshot when the SSH failed.

[Antoine gmail]

The cause of the ssh failure is probably available in your syslog / sshd log.
All we see from this end is connection was closed cleanly.

PS: screenshots are great, but for text data, please use attachments.

[Kundan Kumar]

sshd log.

[Kundan Kumar]

sshd log when connection was accepted through a separate connection, without winswitch.

[Kundan Kumar]

It seems that the ssh connection failure is due to, the following line in sshd_log.

fatal: Unable to negotiate a key exchange method [preauth]

When, ssh connection is initiated without winswitch, connection is accepted by the server, and following message comes.

Accepted password for abhishek from 192.168.56.103 port 51379 ssh2
pam_unix(sshd:session): session opened for user abhishek by (uid=0)

[Antoine gmail]

I believe that the issue you are having is the same as #270: your version of twisted conch does not support the newer key exchange algorithms and so the ssh connection fails.
I very much doubt Debian / Ubuntu will fix this incompatibility by patching or upgrading Twisted, so your only option is to add the deprecated key exchange options as per ticket:270#comment:7.

Please close if this works for you.

[Kundan Kumar]

Yes, it worked for me.