I have a brand-new problem that just cropped up on my ASA. We are using Kerberos authentication for console, ASA, and ASDM access. When anyone tries to log in, our domain controller logs a Security Event ID 675 with failure code 0x19 (pre-authentication failed) and login is denied. (The ASA sends a SA-6-113005 syslog message out.)
On Friday I hard-booted the ASA and after it came back up, the problem was gone, so I chalked it up to gremlins. But now it's back! I'm totally stumped! I hope someone can help.