Specifying port of remote host
You can set up the port to use for connecting to a remote host by adding the port to your ~/.ssh/config file like this:
host 192.168.0.20 port 50000
Then when Wing runs ssh that configuration is used.
I'm not sure why forwarding port 22 as you did failed... it seemed to have connected and run the remote agent (the second to last message came from it), but it's possible something is getting confused by the forwarding.