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I believe that there are no plans to allow NT1 by default for security reasons, so I'm marking this as Won't Fix. The workaround is to manually allow it as you found. ** Changed in: samba (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880305 Title: Failed to mount Windows share: Software caused connection abort To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1880305/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs