This seems to be a new issue for me, where remote computers once all connected as SMB shares no longer mount. Deleted them, rediscovered them, tried explicit names, then IP addresses with no luck. Shares are successfully found but then do not mount.

 

Unraid Version 6.11.5, all plugins up to date (except Community Applications). Any suggestions appreciated.

 

Log file example:

Oct  2 09:16:50 UNRAID unassigned.devices: Mounting Remote Share '//192.168.192.128/C'...
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB share '//192.168.192.128/C' using SMB default protocol.
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB command: /sbin/mount -t 'cifs' -o rw,hard,relatime,noserverino,nounix,cache=none,iocharset=utf8,file_mode=0777,dir_mode=0777,uid=99,gid=100,actimeo=10,closetimeo=30,credentials='/tmp/unassigned.devices/credentials_192.168.192.128_C' '//192.168.192.128/C' '/mnt/remotes/192.168.192.128_C'
Oct  2 09:16:50 UNRAID kernel: cifs: Unknown parameter 'closetimeo'
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB share '//192.168.192.128/C' using SMB 3.1.1 protocol.
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB command: /sbin/mount -t cifs -o rw,hard,relatime,noserverino,nounix,cache=none,iocharset=utf8,file_mode=0777,dir_mode=0777,uid=99,gid=100,actimeo=10,closetimeo=30,vers=3.1.1,credentials='/tmp/unassigned.devices/credentials_192.168.192.128_C' '//192.168.192.128/C' '/mnt/remotes/192.168.192.128_C'
Oct  2 09:16:50 UNRAID kernel: cifs: Unknown parameter 'closetimeo'
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB share '//192.168.192.128/C' using SMB 3.0 protocol.
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB command: /sbin/mount -t cifs -o rw,hard,relatime,noserverino,nounix,cache=none,iocharset=utf8,file_mode=0777,dir_mode=0777,uid=99,gid=100,actimeo=10,closetimeo=30,vers=3.0,credentials='/tmp/unassigned.devices/credentials_192.168.192.128_C' '//192.168.192.128/C' '/mnt/remotes/192.168.192.128_C'
Oct  2 09:16:50 UNRAID kernel: cifs: Unknown parameter 'closetimeo'
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB share '//192.168.192.128/C' using SMB 2.0 protocol.
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB command: /sbin/mount -t 'cifs' -o rw,hard,relatime,noserverino,nounix,cache=none,iocharset=utf8,file_mode=0777,dir_mode=0777,uid=99,gid=100,actimeo=10,closetimeo=30,vers=2.0,credentials='/tmp/unassigned.devices/credentials_192.168.192.128_C' '//192.168.192.128/C' '/mnt/remotes/192.168.192.128_C'
Oct  2 09:16:50 UNRAID kernel: cifs: Unknown parameter 'closetimeo'
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB share '//192.168.192.128/C' using SMB 1.0 protocol.
Oct  2 09:16:50 UNRAID unassigned.devices: Mount SMB command: /sbin/mount -t 'cifs' -o rw,hard,relatime,noserverino,nounix,cache=none,iocharset=utf8,file_mode=0777,dir_mode=0777,uid=99,gid=100,actimeo=10,closetimeo=30,vers=1.0,credentials='/tmp/unassigned.devices/credentials_192.168.192.128_C' '//192.168.192.128/C' '/mnt/remotes/192.168.192.128_C'
Oct  2 09:16:50 UNRAID kernel: cifs: Unknown parameter 'closetimeo'
Oct  2 09:16:50 UNRAID unassigned.devices: SMB mount failed: 'mount error(22): Invalid argument Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)'.
Oct  2 09:16:50 UNRAID unassigned.devices: Remote Share '//192.168.192.128/C' failed to mount.

Please use the existing plugin support thread:

 

 

Update UD and see if it will solve your issue.