Using latest Ubuntu Server: Ubuntu 20.04.1 LTS I am able to successfully mount a SMB share volume from local Fritz Box router using this command:
mount -t cifs //fritz.box/fritz.nas/wd -o rw,vers=3,username=user,password=password,workgroup=WORKGROUP
The permissions of the mount point:
drwxr-xr-x 2 root root
Permissions of a test file copied into the drive after mounting:
-rwxr-xr-x 1 root root 4 Aug 7 13:05 test.txt
However when I try and view the contents of the file:
test.txt: Stale file handle
Editing also says [Permission Denied]
DMESG output after trying to read the file:
[14540.364844] CIFS VFS: bogus file nlink value 0
I've tried various permissions, users, mount options, and differnent CIFS versions, but all with the same result.
I can't revert back to SMBv1 as the Share does not support it.
The share mounts on other systems (Eg. MacOSX) without issue, and I can read/write.