I have had a couple of instances in which my SQL Server has gone offline and stayed in a RESOLVING state instead of failing over. In these instances I see the following SQL Server error message:
A connection timeout has occurred on a previously established connection to availability replica 'ServerName'.
In Event viewer I see this message:
Name resolution for the name 'ClusterName' timed out after none of the configured DNS servers responded.
It seems clear that there is an issue with the connection to the DNS server. I am wondering if anyone has ever created a host file as a workaround for DNS server connection issues.