I'm trying x2goclient from fedora 40 rc2 client to fedora 39 server.
Connection fails at startup "the remote proxy closed the connection during negotiation" There should not be any authentication problem as I can ssh without password.
The client then segfaults.

On the server side, in .x2go/
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#63.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#61.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#62 within 123 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#62.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#62.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#61 within 123 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#61 within 124 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#61 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#60 within 121 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#60 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#62.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#62.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#60 within 124 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#61 within 124 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#61 within 122 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#61 within 124 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#62 within 123 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#62 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#64 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#63 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#62 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#62 within 122 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#63 within 123 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#63 within 122 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#63 within 124 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#63 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! Failure reading from the peer proxy on FD#64.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#64 within 122 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Proxy: PANIC! No data received from remote proxy on FD#64 within 120 seconds.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
Loop: Identified remote version '3.5.99'.
Loop: Remote compatibility version '3.5.0'.
Loop: Local version '3.5.99'.
--
Those who don't understand recursion are doomed to repeat it