In Domain1, I have an MSX with 75+ TSXes registered. Now I've been given some SQL Server instances in another domain. Is it possible to enlist Domain2 instances to an MSX in Domain1 ?
The answer is yes, if
Here is the Master Server setup screen:
In other words, there is no bypassing Windows authentication.
IMO, if there are no trusts between the domains, and there shouldn't be for business or security reasons, I think it would be a better idea to set up a new master server in the other domain, instead of circumventing security just for this.