How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Kerberos Event ID 4771 (0x18) occurring for all domain users despite successful manual logons

calendar_today September 15, 2026 person msema domain microsoft-windows-server

Hello, At one of our clients, we are experiencing repeated Kerberos Pre-Authentication Failed - Event ID 4771, with Failure Code 0x18, on the primary Domain Controller. The issue affects all domain users. All users are able to log in manually without any issues using their credentials.

open_in_new Read original post