Two week before I was able to access my database of mongdb using php script and Robomongo. I have notice since past 4 days that the php was not able to connect and after checking with Robomongo i found that it was getting Authentication but Failed to Authorized.

I tried to connect via ssh on the server and over there I am able to connect with the admin database but not with my log database. Giving me Error 18

> use log_lexpressproperty
switched to db log_lexpressproperty
> db.auth('lexpressroot','XXXXXXX')
Error: 18 Authentication failed.

I cant understand why suddenly it has stopped to work???