Hello Veera,
We appreciate the effort made to provide us with the report, but unfortunately, we were unable to reproduce the problem with the details provided. To further investigate, could you please perform an additional authentication on the /auth/index page (https://linotp_server/auth/index)? If the issue persists on this page, it is likely due to an issue with your configuration of LinOTP. However, if the test page responds correctly, the error may be related to the RADIUS environment (where freeradius passes the authentication requests to LinOTP via https://localhost/).