NTRadPing Tool RADIUS Server Reply Shows "unknown vendor ID 3375" or "unknown vendor ID [vendorID]"
Mar 4, 2026
Okta Classic Engine
Multi-Factor Authentication
Okta Identity Engine
Overview
When running an NTRadPing for testing the RADIUS integration, the RADIUS Server Reply shows one of the following errors:
- unknown vendor ID 3375
- unknown vendor ID [vendorID]
Applies To
- RADIUS
- Used NTRadping Tool to test
Cause
NTRadPing does not recognize the Vendor-Specific and is returning "unknown vendor ID 3375" or "unknown vendor [vendorID]". Since this tool is not owned by Okta, there are not many details available about this error on the Okta side.
Solution
- NTRadPing is just a tool to test whether there is communication between Okta and RADIUS and to test the installation of RADIUS Servers. (This is not an Okta Tool.)
- Check the raddict.dat file, which can be found in the NTRadping install directory. All the supported vendors should be there.
- Update the tool to understand the Vendor's dictionary (for example, F5), and this will show up as expected after running an NTRadPing test.
