am seeing following error when I use test-casserverconnectivity. Some of my iphone 6 pus user keep losing connection.
[System.Net.WebException]: The underlying connection was closed: Could not establish
trust relationship for the SSL/TLS secure channel. Inner error
[System.Security.Authentication.AuthenticationException]: The remote certificate is
invalid according to the validation procedure.
I was able to reconnect them by removing user based device from ADsiedit but now it is not working either.
Also, I have connection error when I tried connecting from Outlook 2016. Email is working on Outlook 2013 and 2011 (mac).
Android users and old Iphone users are able to connect to email