IIS ARR Issue

Hi,

I have two webfarms. One is for our Exchange and one for our PowerBI.

Our exchange is working fine and I can access it on the internet using ARR. However, I keep getting 502 error after entering my username and password for PowerBI. PowerBI site is working internally but not external.

I have a wildcard certificate which is being used both by our Exchange and PowerBI.

Any help is greatly appreciated.

Thanks,

Lyndon