We had to change our Ip address of our POA.
Do we really need to delete the users from GMS or is there another way to
fix it.
From the connection information using the option "Removing this server"
was not a solution.
Deleting the user did resolve the problem. I'm afraid I have to delete all
the users :-(
If there is another way please let me know.

Kinds of regards,
Roberto Faraco