Wi-Fi Error: RADIUS Server Not Responding — What It Means & How to Fix It

What Does This Error Mean?

RADIUS is an authentication server used by businesses, schools, and enterprise Wi-Fi networks. This error means the router tried to check your login credentials with that central server but got no response. If you see this at home, it means your router is incorrectly configured to use enterprise authentication.

Affected Models

Windows 10
Windows 11
Android
iOS
macOS
Enterprise Wi-Fi networks

Common Causes

The RADIUS server at a business or school is offline or overloaded
The wrong RADIUS server IP address or port is configured in the router settings
A firewall is blocking communication between the router and the RADIUS server
The shared secret (password used between router and RADIUS server) is incorrect
A home router was accidentally configured with enterprise authentication settings

How to Fix It

If you are on a work or school network, contact IT support. Ask them to check the RADIUS server status and whether it needs to be restarted or reconfigured.

This is the only option for enterprise networks — end users cannot access RADIUS server settings.
If this is your home network, log into the router admin page (usually 192.168.1.1). Find the Wi-Fi security settings and change from WPA2-Enterprise or WPA3-Enterprise to WPA2-Personal.

Enterprise authentication has no place on a home network. Switching to Personal mode resolves the error.
Check the RADIUS server IP address and port in the router settings. The default RADIUS port is 1812 for authentication and 1813 for accounting. Make sure the IP address matches the server.

A single digit typo in the IP address causes the router to send requests into the void.
Verify the RADIUS shared secret. This is a password the router and RADIUS server share. It must be identical on both — even one character difference causes authentication to fail.

The shared secret is not the same as the Wi-Fi password.
Check firewall rules between the router and the RADIUS server. Port 1812 must be open for RADIUS authentication traffic to pass through.

Overly restrictive firewall rules often block RADIUS without any obvious error on the firewall side.

When to Call a Professional

If you see this on a work or school network, contact the IT department immediately — you cannot fix this yourself. The RADIUS server is managed by network administrators, not end users. If you see this on your home network, log into the router admin page and switch from WPA2-Enterprise to WPA2-Personal mode.

Frequently Asked Questions

What is a RADIUS server in simple terms?

RADIUS is a login verification system used by large organizations. When you try to join an enterprise Wi-Fi network, the router does not check your credentials itself. Instead, it forwards them to a central RADIUS server, which approves or denies the connection. Think of it as a bouncer calling headquarters to verify your ID before letting you in.

Can I fix a RADIUS server error at home without IT help?

If it is your own home network and you accidentally enabled enterprise authentication, yes. Log into the router and switch to WPA2-Personal or WPA3-Personal mode. If it is a work, school, or public network, no — you need the IT team to fix the server.

Is RADIUS server not responding a sign my credentials are wrong?

No. If your credentials were wrong, the RADIUS server would respond with a rejection. 'Not responding' means the server is unreachable — it never even received your login attempt. The problem is network connectivity to the RADIUS server, not your username or password.