What you’ll notice: Slow logins, GPOs not applying, or DCs not talking to each other.
Why it happens:
- Domain Controllers are pointing to external DNS (like Google DNS)
- DNS records (like SRV) are missing
How to fix it:
- Make sure all DCs use internal DNS
- Run
ipconfig /registerdnson each DC - Restart the Netlogon service
- Check DNS zones and SRV records in DNS Manager
