Out-of-band AG hotfix for SQL Server 2012 SP2 and SQL Server 2014

A hotfix has been released for an issue that causes Availability Groups to show as NOT SYNCHRONIZING. The original issue is described in KB #3033492 and in this SQL Server Release Services Team blog post.

The issue was introduced through Cumulative Update #5 for SQL Server 2014 RTM, and through Cumulative Updates #3 and #4 for SQL Server 2012 SP2. As far as I can tell, SQL Server 2012 SP1 is not exposed to this issue, likely because the specific fix in CU3/4 that triggered the issue was not present in the most recent CU for SP1 (and CUs for RTM stopped a long time ago – so if you're still on RTM, here's another reminder to get onto a supported branch, preferably SP2).

If you're using Availability Groups, or are currently at builds >= 11.0.5556 or >= 12.0.2456, I highly recommend applying the appropriate hotfix. You can download it here:

KB #3034679

And you can also see my recommendations in the following blog posts:

By: Aaron Bertrand

I am a passionate technologist with industry experience dating back to Classic ASP and SQL Server 6.5. I am a long-time Microsoft MVP, write at Simple Talk, SQLPerformance, and MSSQLTips, and have had the honor of speaking at more conferences than I can remember. In non-tech life, I am a husband, a father of two, a huge hockey and football fan, and my pronouns are he/him.

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