I’ve got a documentDB setup in a VPC, 2 private subnets (call them A and B).

I setup the Glue connection by selecting the appropriate VPC, subnet A, and a security group that has subnet access.

I added the documentDB url and manually added the username/password. Database name is correct and SSL is enabled.

In the end I get this connection string (edited slightly)

mongodb://username:mypassword@my-documentdb-cluster-1234567890.us-west-2.docdb-elastic.amazonaws.com:27017/Chimera/?ssl=true'

This looks fine, but I get

Error Category: UNCLASSIFIED_ERROR; An error occurred while calling o106.getDynamicFrame. Invalid connection string

When I try to start a data session or run the job.

I have verified in my code and this connection string looks identical to the one used in the app for connecting to DocumentDB.