Error in plesk database

[alvaro m]

Hello, trying cinfigurar aller databases, I equiboque and set plesk database and the database of users, ie, set the one in plesk / mysql /. The question is ue change the port from 8306 to 3306 and I was wrong then he went back to port to 8306 and it only gives me the following error:
ERROR: PleskMainDBException
DB query failed: Unknown error

0: common_func.php3:114
db_query(string 'set names utf8')
1: common_func.php3:612
reconnect()
2: common_func.php3:577
db_connect()
3: auth.php3:148