Error 1102 on Kyocera/Copystar

Kyocera/Copystar manual describes that
error 1102 means that “The login user name is incorrect or the
domain name has not been entered. Enter login user name, domain and
password correctly. But world is not so simple. Windows Vista/Windows
7 users who are on a domain must enter there complete user name in
this format: (domainname\username). Make sure that the user has write
access to the folder being shared (See How to setup SMB). If
everything is fine, check if the firewall is blocking communication
between the machine and PC by temporarily turning off the firewall.