[Samba] no access to share after long timeout

[Hleb Valoshka]

We've got file server with samba 3.6.6 (debian 7 package) set as AD
member server. Users usually connect to it and leave their sessions
open. On the next day when they try to open any file or directory on
shares they receive message that access is denied. If I kill their
session on server they reconnect and work without problems.

As a workaround I've set parameter deadtime in smb.conf. May be there
is a better solution? It seems to me, that the problem is related to
kerberos principal expiration.