I noticed I got "Error: read: Connection reset by peer" every time the application has issues reading my .ssh/config file.

For example, if I had comments at the end of a line, like:

LocalForward 2101 10.0.0.99:9909 # xxxx server VNC

It will trigger the problem, but if I change it to:

# xxxx server VNC
LocalForward 2101 10.0.0.99:9909 

it will work... (note that neither ssh or scp are having any issue with those parameters).

Now I'm having the issue again, and I suspect this is the same kind of parsing problem (I can connect if I rename my .ssh/config before clicking the "connect" button) but I cannot figure out which of the 350+ lines in my .ssh/config is causing issues (and I'd prefer not having to strip all comments because it would become unmaintainable).

I'd like to give more details but if some issues mention a "debug mode" that displays more information, I couldn't find out how to activate it.