Acces denied for 'nagiosql_user'@'localhost'

Hi,
I fail to connect to my nagiosql by web. I have changed my password in my db mysql, the password from my admin (tbl_user) and give all rights to admin user to db_nagiosql_v3.
I respect the official doc for rights access for directories.
I restart my httpd and mysqld service but it does’t work…
Shall I restart an other nagiosql service?
thanks,
seta

what “official” docs are you following? you shouldn’t be changing passwords for all users, and only one password needs to be set.