What is a TransientTransactionError in Mongoose (or MongoDB)?

Question

I have server.js and db.js The db.js file interacts with my database using Mongoose and I use server.js to call functions

Answer 1

I had similar problem... All day I was able to connect via mongoose. Then bang I started getting 'TransientTransactionError' error. I could connect to mongoDB via shell so I knew the server was up and running as expected.

IPv6/localhost. My IP switched from IPv4 to IPv6. I resolved the issue by disabling IPv6 and getting regular IPv4 IP.

EDIT -- seems I can reliably re/create this issue by connecting to 'localhost' while my NIC is configured with a IPv6 IP. Changing localhost->127.0.0.1 seems to resolve the issue.