Thank you for sending the error log for review. In order to verify that
the primary is running and reachable, could you please post the output of
rs.status() for analysis?
Please review rs.status()
<https://docs.mongodb.com/manual/reference/method/rs.status/> for more
information on this command.
You may also find it helpful to review replica set troubleshooting steps
help guide you on resolving common replica set issues.
It might also be useful to check the DNS. It might be a situation where
the service is unable to resolve the hostname.
Could you send us a snippet of code for your C# app that contains the
connection string and also the readPreference settings?
Can you please verify the MongoDB C# driver version ?
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