Access denied for user: '@domain'

I have configured connection to my Mysql database, but I cannot access to it when I click "Explore your MySQL databases. Below is my configuration which is standard and simple. [database-server.domain] host = database-server.domain port = 3312 schema = DBSchema username = username password = password __f_ns = MySQL

When I go to Explore your MySQL databases I get error on the top of page with alert:

(1045, u"Access denied for user: '@splunk.server.domain' (Using password: NO)")

Interesting thing is that there is no username in the alert. I have no idea why.