CIFS VFS: BAD_NETWORK_NAME

Issue

• Windows SMB share mounted on Linux servers getting disconnected once in a while.

• Brief introduction of the environment is as following:
  Few LINUX servers which has CIFS shares mounted from Windows file share (support SMB 3 only) and shares on Linux clients are mounted with following option in fstab file.

//servername/folder /localfolder   cifs   credentials=/login.txt,x-systemd.automount,x-systemd.device-timeout=5,_netdev,noserverino,noperm,sec=ntlmssp,vers=3.0 0 0

• The above share gets disconnected and automatically unmounted once in a while from the Linux servers. Upon checking the messages logs and following errors are logged:

kernel: CIFS VFS: BAD_NETWORK_NAME: \\servername\folder

• To fix this manually unmounting and mounting needs to be done.

• Backup jobs are shared in a CIFS share which got disconnected from RHEL server.