Page History

...

$ tsh status
> Profile URL:  https://shell.ecmwf.int:443
  Logged in as: firstname.lastname@ecmwf.int
  Cluster:      shell.ecmwf.int
  Roles:        *
  Logins:       ab0
  Valid until:  2020-06-22 23:26:30 +0100 BST [EXPIRED]
  Extensions:   permit-X11-forwarding, permit-agent-forwarding, permit-port-forwarding, permit-pty

From OpenSSH 8.4 the client may refuse to connect with the cryptic message: "Connection closed by UNKNOWN port 65535".

This is because the Teleport system has to remain compatible with some old OpenSSH server versions.

...

The problem will go away when our Bologna data centre is used instead.

The fix is to add this extra line to your OpenSSH configuration:

Host ecgate
  User ab0
  ProxyJump ab0@shell.ecmwf.int
  PubkeyAcceptedKeyTypes 

+ssh-rsa-cert-

v01@openssh.com

Destination Hosts available

...