The Teleport service is configured to use only standard ports 22, 80, and 443, to help with access wherever users are.

Additional configuration at the local user site may be required to allow outgoing connections. The diagram below shows the TCP ports and destination hosts used.

Versions 8.3.5 and newer of the tsh application support use of proxies (HTTP_PROXY , etc).  However, if the HTTPS_PROXY , etc, environment variable is set, tsh  will also attempt to make an ssh connection on port 22 using the proxy.  If your proxy does not support ssh connections to port 22 then set:

$ export no_proxy="jump.ecmwf.int:22"