Error on install SQLSTATE[HY000] [2002]

when installing piwik i get:
[right]Error while trying to connect to the database server:
SQLSTATE[HY000] [2002] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.[/right]

what can i say?
on the db side all seems ok - any help???
God bless
gabriel

Maybe check that you specify the right database server hostname and login details?