Hey everyone! I'm dealing with a problem on my NPS server in the main domain "contoso.com". I have a machine connected to the subdomain "sub1.contoso.com" that's trying to log into our internal WiFi. When the access point sends a RADIUS request to the NPS, I get an error in the NPS event log saying there's no domain controller for the domain (Event ID 4402). This issue pops up only for sub1.contoso.com, as the authentication for the other 14 subdomains works just fine. I've already checked the NPS configuration, and it seems correct. The firewall is good, and DNS is functioning properly on the NPS server—"nltest /dsgetdc:sub1.contoso.com" confirms the right domain controller is available. Interestingly, the domain controller for sub1.log shows the NPS server logging in successfully. Anyone experienced this issue before? Any help would be appreciated!
3 Answers
Is your NPS server properly authorized in AD? I just want to make sure that’s all set. Also, could there be any Global Catalog issues? Check the AD logs on the DCs for errors. Can your NPS connect to the Global Catalog and LDAP on that domain?
Just to clarify, you have 15 AD domains in your Forest, right?
It sounds like a DNS issue to me. Make sure the NPS server for sub1 is pointing to the domain controllers for that subdomain. Have you authorized the NPS server in Active Directory? That could be a key step you might be missing.
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