Various forms of Ubuntu have a buggy SSH. If you use Ubuntu first re-evaluate your life decisions and what has led you to this point, then do the following.
Add this to your
~/.ssh/config replacing anything within
<> brackets with an
<user>is your MergeTB user name.
<id_rsa>is the private key corresponding to the public key you uploaded to the Merge Portal.
<project>is the name of project containing XDCs you want to connect to.
ProxyCommand ssh -p 2202 -i ~/.ssh/<id_rsa> -W %h:%p %firstname.lastname@example.org
Then you can SSH into an XDC with
For non-buggy SSH (OpenSSH 7.3+), you can use the following instead