Windows 10 Share File: //10.108.16.56/lnxvda-rf/ROBOT

[root@rhels73 robot]# mount -t cifs -o username=administrator,password=citrix //10.108.16.56/lnxvda-rf/ROBOT /opt/robot
mount error(112): Host is down
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

I had this issue, then discovered that adding one of the following to the mount options makes it work! No idea why though - is the kernel module failing to auto-negotiate?

vers=2.1 vers=3.0

[root@rhels73 robot]# mount -t cifs -o username=administrator,password=citrix,vers=3.0 //10.108.16.241/lnxvda-rf/ROBOT /opt/robot
[root@rhels73 robot]# df -h
Filesystem Size Used Avail Use% Mounted on
127.0.0.1:/ 2.0G 1000M 1000M 50% /ctxmnt
tmpfs 184M 0 184M 0% /run/user/0
//10.61.8.130/builds 43T 41T 2.6T 95% /opt/build
//10.108.16.241/lnxvda-rf/ROBOT 100G 18G 83G 18% /opt/robot