Cross domain authentication requiring domain.com\username for login

Lean IT
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We recently configured a forest trust between two domains and we have been able to cross authenticate.  However, it only works if the user puts in domain.com\username.  It isn't enough to just put in domain\username.

The scenario looks like this.

User at company.b.com is logging into a server at company.a.com.  To use the username and password for their compay.b.com account they need to log into the server as company.b.com\username.

Is that typical or is there anything we can do to make the login domain not require the .com?

Is there something else we can do in DNS to allow this to work?
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RobertSystem Admin

Commented:
Not sure what server OS etc your running but you may want to review the following article and see if it applies to your situation.

https://support.microsoft.com/en-us/help/2675498/netbios-domain-name-username-format-cannot-be-used-with-the-kerberos-r
Shaun VermaakSenior Consultant
Awarded 2017
Distinguished Expert 2018

Commented:
Is that typical or is there anything we can do to make the login domain not require the .com?
No, not typical

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