• hmmm ... it sounds like you have a 2 node active/active cluster here.

    if these were just OS patches and not SQL Server related shutting down SQL on a node, applying the OS patches and rebooting should have worked just fine one node at a time.

    did you find any other errors inside the Windows logs or the cluster logs ?

    RegardsRudy KomacsarSenior Database Administrator"Ave Caesar! - Morituri te salutamus."