Web UI showing incorrect error when connecting to a host that is offline

[rosstimothy]

Expected behavior:

The session should display a message indicating that the node is offline:

Teleport proxy failed to connect to "node" agent "127.0.0.1:3022" over direct dial:

  dial tcp 127.0.0.1:3022: connect: connection refused

This usually means that the agent is offline or has disconnected. Check the
agent logs and, if the issue persists, try restarting it or re-registering it
with the cluster.

Current behavior:

The session displays an error about MFA problems:

“rpc error: code = PermissionDenied desc = MFA is required to access this resource but user has no MFA devices; use ‘tsh mfa add’ to register MFA devices”