MongoDb authentication fails in Laravel only for localhost

We recently shifted our shifted our database (MongoDb) and a Laravel application to a new server. Earlier everything was working fine when both, the database and 2 Laravel apps were on the same server. I then shifted the MongoDb to a new server. Again things were working fine. Later I shifted one of the Laravel application to the same new server as the database. Now I am facing issues in authentication for the Laravel server.

This is what is working for me currently: bindIp in MongoDb is set to 0.0.0.0 security.authorization is disabled.

This works but obviously, I cannot have this since anyone can access the database without authorization.

If I keep the security.authorization enabled, my I can connect to the database remotely and also from the same machine using the mongo command line, but the Laravel app on the same machine cannot access it. I get the following error:

Failed to connect to: 127.0.0.1:27017: Authentication failed on database 'abcd' with username 'abcd': auth failed

I have tried various settings with security.authorization and bindIp. Nothing seems to work. The user for the database has the same roles as the one on the previous server.

via Chebli Mohamed