I have an Exchange Server 2010 running on SBS2011Std that is refusing incoming connections today (was okay up until now).
If I try to telnet in from outside I get:
421 4.3.2 Service not available
Connection to host lost.
I am not sure if this is related, but seems likely - there are non-stop errors in the event log:
Event ID: 36887
The following fatal alert was received: 46
Finally, my suspicion is that this has been caused by us trying to renew the external TLS certificate (Go Daddy) which was done a couple of days ago, and the old one would have expired today.
I have researched all of the above on the net, but have gotten precisely nowhere.
Any thoughts would be appreciated.