When users trying to connect OWA in Exchange 2010 getting error “500 – Internal server error”
There is a problem with the resource you are looking for, and it cannot be displayed.
When users click options it actually redirect you to https://tech.com/ecp.
After lot of research I suspected IIS when I opened IIS then application pools, I found that .net framework on MSExchangeECPAppPool is V4.0
Double click on MSExchangeECPAppPool, and selected .net framework V2.0 and click ok. After making changes all my users were able to access OWA successfully.