MongoDB Shell error - Auth mechanism not specified

Question

I am trying to login to a remote MongoDB server and I am running into `Auth mechanism not specified` error.

```sh
> mongo -u user_name -p pwd xx.x.x.xxx/db_name
MongoDB shell version: 2.6.10
connecting to: xx.x.x.xxx/db_name
2021-10-28T14:56:37.723+0000 Error: 2 { ok: 0.0, errmsg: "Auth mechanism not specified", code: 2, codeName: "BadValue" } at src/mongo/shell/db.js:1287
exception: login failed

Karthik Divi · Accepted Answer

This is because of the old MongoDB shell. Try upgrading the shell and see if that resolves the issue.

You can upgrade by running the following command

```
sudo apt-get install mongodb-org-shell
```

MongoDB Shell error - Auth mechanism not specified

1 Answer