[ubuntu] Samba Server Roaming Profiles: Some users occasionally unable to login

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http://ubuntuforums.org – I have a Ubuntu Samba Server setup to handle roaming profiles for my windows 7 machines. After a few early hiccups, everything seems to be working alright, however every once in a while a user will not be able to login at startup with an error code saying 'there are currently no logon servers available to service the login request' even though a different user right beside can login without a hitch. It takes restarting the windows machine three or four times before it finally allows the logon. Are there any special router settings i need to setup or is this a problem on the server itself? I (Hardware)