I ran into something similar to this. We use our domain "A" account to install software and log onto windows servers as Admins via RDP. I had 2 RDP sessions running between 2 cluster nodes and were running SSMS with AOAG dashboard app running. A new security tool expires our A accounts every 24 hours. I was seeing these "Error 20 Alert" SQL email alerts firing when my passw expired. "SSPI handshake failed with error code 0x8009030c, state 14 while establishing a connection with integrated security". I guess the solution is I cant keep SSMS running for monitoring AG's. Just need to logoff out of RDP session before I go home.
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