The password of TMSADM is unrelated to this as it always needs a password for the domain - the question is just which one.
At most if the TMSADM cannot even connect for the "uncritical" functions via the TMSADM* destinations as this has a fixed user in it, then it will not even reach the TMSSUP* destinations which is where Tim's problem is for the "critical" functions.
I suspect that these are two different problems for which the symptom appears to be the same -> it does not work.
Cheers,
Julius