Thanks, now I got it.
The linked posting says: "There are some universal passwords"
That is true, although they are not really "universal", so these could be tried first, but if they don´t work then back to my suggestion:
"If there is a PW you should ask the one who provides/requests it.
Ask the original poster of the issue you are corresponding to, there is no general standard for all of them."
The one who made the PW should really know it and he should not forget to post it (hidden) as well...otherwise the first one who needs it should inform the responsible one to review his posting.
IF the one in charge does not reply or review his posting then contact a Moderator.