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• The "tsh login" step uses ports 80 and 443 in order to log in to the service and obtain the client certificate. 
  • initially it contacts jump.ecmwf.int  on port 443 (the user is able to see these steps by using the "tsh login --debug"  option)
  • then it opens a local http client on a high port 64xxx, produces a URL link on the localhost for the user to follow (such as:  http://127.0.0.1:64068/da92794b-9d41-4008-ae6f-83fb77f64486) and waits for a callback from jump.ecmwf.int.
  • that localhost URL then redirects the user for OIDC authentication at https://accounts.ecmwf.int (on port 443) involving Keycloak linked to user accounts on ActiveDirectory and the ActivIdentity (HID) TOTP security token
  • upon successful authentication, tsh receives a callback from jump.ecmwf.int  and receives the client certificate completing its login workflow
  • from this point on, with the client certificate which is valid for 24 hours, the user is authorised to access hosts behind the teleport proxy either via tsh ssh or OpenSSH workflows
• Your ssh client uses the standard port 22 for server access.
• The Teleport web shell service uses port 443 on the same host.

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