Challenge
You are running an Always On availability groups on a Windows Server Failover Cluster using Mircosoft SQL Server 2017.After installing Cumulative Update package 15 (CU15) for SQL Server 2017 transaction log backup may fail with the following error message in the the statistics window for the transaction log backup job :
Configuration data for the availability group with Windows Server Failover Clustering (WSFC) resource ID '<resource ID>' is not found in the WSFC data store. The availability group may have been dropped, or a previous CREATE AVAILABILITY GROUP or DROP AVAILABILITY GROUP operation has failed. Please use DROP AVAILABILITY GROUP command to clean up previously failed operations before retrying the current operation.
Cause
It is a known issue in CU15 for SQL Server 2017.Solution
On-demand hotfix update package for this issue has been released:https://support.microsoft.com/en-us/help/4506633/on-demand-hotfix-update-package-for-sql-server-2017-cu15