Problem
Older versions of Linux has SMB2 instead SMB3_02 in /etc/smb.conf
Solution
Therefore you have to change it to SMB3_02 in /etc/smb.conf for access followprint at NTNU.
More info about SMB in manualpage.
man smb.conf
On the last windows updates they using SMB 3 as min protocol and max protocol settings in the
smb.conf on Linux 16.04 clients.
This problem can happen on Ubuntu Desktop 16.04 LTS.
You must add these entries in you /etc/samba/smb.conf
under global section.
[global]
client max protocol = SMB3_02