Proxying to upstream radius server doesn't work

[Jeff-Tian]

Describe the bug
Proxying to upstream radius server doesn't work

To Reproduce
Steps to reproduce the behavior:

1. Running a local radius server in docker by

docker run --rm --name my-radius -t -p 1812-1813:1812-1813/udp freeradius/freeradius-server -X

2. issue radtest bob test 127.0.0.1 0 testing123 and found the radius server received the login attempt and reject. It shows the radius server is working.
   

3. Running a keycloak radius plugin instance by

sh bin/kc.sh --debug 8190 start-dev --http-port=8090

as per the https://github.com/vzakharchenko/keycloak-radius-plugin/releases v1.4.2-17.0.0 steps
5. Configure the proxy as per the doc: https://github.com/vzakharchenko/keycloak-radius-plugin/tree/master/keycloak-plugins/proxy-radius-plugin
6. When logging into the keycloak instance, no log from radius server. And the logging is success without any issue

Expected behavior

• There should be receiving logs from radius server.
• The logging in should fail as should be not allowed from radius server.