FIX: You don't receive any information about the replica when it is not visible in the availability group in SQL Server
Assume that you use the AlwaysOn availability groups feature in Microsoft SQL Server 2012 or SQL Server 2014. When communication between the Windows Failover Cluster and one of the replicas fails, the replica is no longer visible in the availability group. Additionally, the database changes to the restoring state.
After this situation occurs, you don't receive any information from the SQL Server error log to further troubleshoot the problem.
The issue was first fixed in the following Service Packs for SQL Server.
bugs that are fixed in SQL Server 2012 Service Pack 3.
About Service packs for SQL Server
Service packs are cumulative. Each new service pack contains all the fixes that are in previous service packs, together with any new fixes. Our recommendation is to apply the latest service pack and the latest cumulative update for that service pack. You do not have to install a previous service pack before you install the latest service pack. Use Table 1 in the following article for finding more information about the latest service pack and latest cumulative update.
How to determine the version, edition and update level of SQL Server and its components
For more information about the dropped-replica issue, see Issue: Replica Unexpectedly Dropped in Availability Group.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 3112362 - Last Review: 07/11/2016 17:13:00 - Revision: 2.0
Microsoft SQL Server 2012 Developer, Microsoft SQL Server 2012 Enterprise, Microsoft SQL Server 2012 Standard, Microsoft SQL Server 2014 Developer, Microsoft SQL Server 2014 Enterprise, Microsoft SQL Server 2014 Enterprise Core, Microsoft SQL Server 2014 Express, Microsoft SQL Server 2014 Standard, Microsoft SQL Server 2014 Web
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