Recent update to v1.9.0 added { useUnifiedTopology: true } option as default and it seems it can cause this issue ("MongoTimeoutError: Server selection timed out after 30000 ms"). According to this discussion, updating mongodb native driver to v3.3.4 may fix the issue, although I'm not sure if this really relates to my exact case. Could you update mongodb version to 3.3.4 or even up to the latest 3.4.0?
Recent update to v1.9.0 added
{ useUnifiedTopology: true }option as default and it seems it can cause this issue ("MongoTimeoutError: Server selection timed out after 30000 ms"). According to this discussion, updating mongodb native driver to v3.3.4 may fix the issue, although I'm not sure if this really relates to my exact case. Could you update mongodb version to 3.3.4 or even up to the latest 3.4.0?