I have another mount form Windows7 //orn-evkogan-win/c /mnt/cifs/orn-evkogan-win cifs vers=2.0,sec=krb5,_netdev,soft,user,nounix,file_mode=0700,dir_mode=0700,noauto 0 0 It will behave the same way cifs connection disconnects in the 2.0 and 3.0 version and i tested it is not related with kerberos ticket