Hi Paulo, On Wed, Mar 20, 2019 at 6:50 PM Paulo Alcantara <paulo@xxxxxxxx> wrote: > Looks like a signing issue when using guest auth in SMB3.11. Could you > please try mounting it with vers=1.0, vers=2.1 and vers=3.0 and see if > it works? vers=1.0 works: root@ubuntu:~# mount //localhost/pub /mnt -o guest,vers=1.0 root@ubuntu:~# mount -t cifs //localhost/pub on /mnt type cifs (rw,relatime,vers=1.0,sec=none,cache=strict,uid=0,noforceuid,gid=0,noforcegid,addr=127.0.0.1,soft,unix,posixpaths,serverino,mapposix,acl,rsize=1048576,wsize=65536,echo_interval=60,actimeo=1) dmesg: http://paste.ubuntu.com/p/qQz3kBkpzM/ vers=2.1 also works: root@ubuntu:~# mount //localhost/pub /mnt -o guest,vers=2.1 root@ubuntu:~# mount -t cifs //localhost/pub on /mnt type cifs (rw,relatime,vers=2.1,sec=none,cache=strict,uid=0,noforceuid,gid=0,noforcegid,addr=127.0.0.1,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,rsize=1048576,wsize=1048576,echo_interval=60,actimeo=1) dmesg: http://paste.ubuntu.com/p/rWSsndKjPN/ vers=3.0 works: root@ubuntu:~# mount //localhost/pub /mnt -o guest,vers=3.0 root@ubuntu:~# mount -t cifs //localhost/pub on /mnt type cifs (rw,relatime,vers=3.0,sec=none,cache=strict,uid=0,noforceuid,gid=0,noforcegid,addr=127.0.0.1,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,echo_interval=60,actimeo=1) dmesg: http://paste.ubuntu.com/p/rVKhYqmTTc/ and just to be complete, vers=3.11 fails: root@ubuntu:~# mount //localhost/pub /mnt -o guest,vers=3.11 mount error(13): Permission denied Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) dmesg: http://paste.ubuntu.com/p/sprkDFY5XH/