Error logging into runtime user

[rreadenour]

My coworker recently added a new windows agent that is on a different domain than her Tidal master and is getting the error

*** Error logging into runtime user    when she tries to run a job through Tidal. 
She verified that the runtime user has the proper rights on the agent server, she logged onto the agent as the runtime user and ran the script from the job manually and it ran successfully.

Is there a known problem with using a runtime user that was created in domainA but trying to run a job on an agent server in domainB?

Thanks

[rreadenour]

It turns out that the problem was with the userid the agent service was running under.  She changed the service to run with the Local System credentials and the problem was solved.