Problemas com montagem Remota - CIFS

Bom dia,

Tenho rotinas de backup de sistema e de oracle que fazem cópia remota. Em alguns momentos a cópia ocorre com sucesso e outras não. Aparecem várias mensagens nos logs:

Feb 13 22:38:58 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 22:38:58 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 22:38:58 srv-ora-01 kernel: CIFS VFS: Send error in QFSAttributeInfo = -13
Feb 13 22:38:58 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 22:38:58 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 22:38:58 srv-ora-01 kernel: CIFS VFS: cifs_mount failed w/return code = -13
Feb 13 23:00:14 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 23:00:14 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 23:00:14 srv-ora-01 kernel: CIFS VFS: cifs_mount failed w/return code = -13
Feb 13 23:00:14 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 23:27:07 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 23:27:07 srv-ora-01 kernel: CIFS VFS: Send error in Close = -13
Feb 13 23:27:07 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 23:27:07 srv-ora-01 kernel: CIFS VFS: Send error in Close = -13
Feb 13 23:30:28 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature
Feb 13 23:30:28 srv-ora-01 kernel: CIFS VFS: Unexpected SMB signature

Como devo proceder?