Okta RADIUS Agent Install Error "Unable To Save Configuration Parameters. Error Code: 259"
Oct 16, 2025
Okta Classic Engine
Multi-Factor Authentication
Overview
Installing the Okta RADIUS Agent will fail with the error message:
Unable To Save Configuration Parameters. Error Code: 259
The error is also logged in the Okta RADIUS Agent logs as:
OAuth Code has expired, please restart the registration process
Applies To
- Okta RADIUS Agent
- Firewall Allowlisting
- Okta Classic Engine
Cause
The required Okta domains have not been allowlisted in the firewall/proxy configuration.
Solution
The behavior can be addressed by allowlisting the Okta domains in the firewall/proxy configuration, as per the details specified in the Firewall Allowlisting documentation.
