Well, that was a weird start to the day. I started getting the following error while attempting to connect from my Windows 10 machine to my Samba fileserver:
System error 1168 has occurred.
Element not found.
I’ve been using my yaleman@domain SPN-style username for a long time to keep the permissions correct across the filesystem… and now it just stopped working? Random.
I had to create a new user without the full SPN in Samba (smbpasswd -a yaleman) and it works now. Stupid Windows.