ISE dot1x working BUT ..... client is getting "PROXY SERVER unreachable"

Dear Experts,
From ISE 2.x I am able to ping the proxy server but once windows user authenticated and logs in, he cannot go to the internet and gets proxy error.
Let me know some points and vectors to look into !!!
waiting.

The only time ISE would perform traffic redirection is when you doing things like CWA (Central Web Authentication), Posture Assessment, etc. If you are just doing basic dot1x/mab authentication then ISE just decides who gets on the network and what type of access that person/devices gets.
With that being said, what happens if you remove dot1x authentication from the port? Can the client reach ISE then? (you can quickly remove dot1x by issuing no authentication port-control auto)
Other things to try:
1. Remove the dACL
2. In the authorization rule, return the default "permit access"
3. Remove the ACL on the FW
4. Anything else that might be affecting the connection
With the process of elimination you should be able to find the root cause of the issue
Thank you for rating helpful posts!

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