Released: July 2021 Exchange Server Security Updates

Have run into exact same issue with ECP\OWA broken

My Auth Certificate was missing so i generated a new one according to articles mentioned and 3 hours later i am yet to see any results

I have tested with one server uninstalling update and it fixes issue instantly, i did try also another server the uninstall but unfortunately the uninstall msi box crashed and server is now non functional

I has a test environment also with this issue and with a valid Auth Certificate and it still caused this error and restoring the Auth Cert with same thumbprint seemed to fix issue, so there seems to be many use cases

This needs to be raised as a priority as a issue as it seems to be popping up all over Reddit\ Twitter just to name few sources and we need some sort of definite and tested fix from MS just so we have a certain path - or pulling the update might also be advised until it can be investigated more thoroughly

I abandoned my usual cautious approach to updates with all the bad press about vulnerabilities and installed this update onto a few servers which seems to have backfired big time so would love some guidance from the Product team Nino_Bilic  The_Exchange_Team