sec= in mount.cifs is a client setting, I was quoting the mount.cifs manpage where it says when that changed defaults in the (client machine's) kernel.
Either way, I believe the solution to what you reported is in the first paragraph of comment #21. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to samba in Ubuntu. https://bugs.launchpad.net/bugs/1703490 Title: Unable to mount network volume on 17.10 Samba server To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1703490/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs