Rather than starting a new thread…
I have had a WD My Book on the network since 2016 and "suddenly" I cannot access it from my Linux box.
The mount command has been:
sudo mount -t cifs -o uid=MYNAME,gid=MYGROUP,username=MYDISKNAME,passwd=MYPASSWORD //192.168.1.###/Public /mnt/pub
(appropriate content for name, group, password, and address)

I can still access the drive through a browser interface from the Linux box, and can still access the shares from a Windows box, so the drive is still (apparently) working. The problem "must" be in cifs.

I am running Mint 18.2 (Sonya)
mount.cifs version: 6.4

EDIT: syslog:
May 30 10:41:25 MACHINENAME kernel: [ 3037.635896] CIFS VFS: Error connecting to socket. Aborting operation.
May 30 10:41:25 MACHINENAME kernel: [ 3037.636198] CIFS VFS: cifs_mount failed w/return code = -111

You should start a new thread. It is a new unrelated problem so you should open a new thread.

This gives information about error -111
https://stackoverflow.com/questions/...e-111-indicate

jlinkels