AD user names

Is there any restriction on the username in AD authentication? My username as assigned by the client is able.baker. They tested it and it works on their domain, but I get an error when trying to test it from the Ignition Gateway. Error while authenticating through LDAP, see log for details. Nothing interesting in the log. Is it opposed to the . in the user name?

Not that I know of. Do you have a user without the period in their username to test out?