• Did you actually configure the instance to work with port 1433 ?
• What happened to your D-drive ?

  It seems the files on D-drive are missing or no longer accessable...

have a look at SQL Server backup to URL"

We all started here as more or less noobs.

Heck, I've also met certified people who had only proven they could learn the content of a book, but weren't able to...

such a shame they wasted all those years of development time SSMS still needed and needs to comply with modern development needs

Can't QueryStore help out ?

We always use an extra sqlagent job step to check it the database is primary.

If not : fail the step and end the job

Else run the next step(s)

how about a NULL set for an answer ?

Which Isolation Level are you using to execute the command in VB.Net ?

Isolation Levels explained by Kendra Little

That is great news.

Thank you for the feedback.

Would it be possible to post a snippet of the log that hinted you towards TraceFlag 3057 ?

Are you using a Listener to connect to ?

If not, chances are your db switched to primary on the other node.

Do you have (failed) login monitoring ( xEvents )...

The question is:

• Is it still possible to produce the backup from the original database ?

  • if yes:  please do and try to restore again ( use the trace flags...

• Check the sql server ERRORLOG file
• enable trace flag 3004 to show the internal backup/restore operation and more.

  This is an undocumented TF, so remove as soon as possible !

It's always nice to provide usable object models (ddl) with sample data and the actual queries, isolation levels, ....

That is indeed the best practice