Connecting to Remote Computer Domain Field is sometimes empty

Logging in to a remote computer works well, but I've noticed that sometimes when I connect, the "Log in to" field is either set to blank, or set to the local computer name.  Is there a way to make it default to the domain name every time?  I can't seem to find any references to it in the support documentation, so I thought I'd ask here.  Thank you for your time.