I have 4 Exchange Servers 2016 CU22 Frontend; Only CAS Function | CAS Role
I have 6 Exchange Servers 2019 CU11 Backend; Only MBX Function | MBX Role
Internet ==> HLB (Hardware Load Balancer) ==> CAS ==> MBX
PS: Exchange Server 2016 CU22 is kept as CAS Role to maintain compatibility with older email clients.
PS: I applied the Security Updates for both versions as well, but I tried it before without applying it and it didn't work either.
All users when accessing shared calendar settings get this error <HTTP ERROR 500> below using Exchange Server 2016 CU22 with proxy function.
But. if i access directly through an Exchange Server 2019 CU11 using my file host by VPN to test the feature works perfectly.
Follow the configuration: