I can't reliably reproduce this bug. 

I opened VSCode after fully closing it on my mac. When it opened I opened the extension and tried to connect to a cluster. It fails consistently with Unable to connect: querySrv ECONNREFUSED mongodb._tcp.cluster0.omittted{_}.mongodb-dev.net
This happens to all connections with credentials.

Opening a new VSCode window, all of the connections work in the new window. They still don't work in the original window.

This only happens with connections with passwords/credentials. localhost succeeds. I'm thinking there's a race condition in our connection loading logic. It could be something with migrations - it's worth seeing if this happens after the extension auto updated.

Not marking this as a p2 as I haven't been able to reproduce this again. It is a disruptive experience that will make folks not use the extension, so if it is reproducible it should be a p2.