My service provider switched server ip address - my forum is not working

[rkkota2004]

Dear Friends

Pls help, as my forum is not working and all of our 20000+ members effected.

Immediate help is very much apprciated.

here is the situation:

1) My hosting provider switched/moved everything to other server and
he has given me ipaddress of it.
And he told the forum database is also moved to this new server

2) I just updated my config file with new ip address:

// ****** MASTER DATABASE SERVER NAME AND PORT ******
// This is the hostname or IP address and port of the database server.
// If you are unsure of what to put here, leave the default values.
$config['MasterServer']['servername'] =<I replaced this with new ip address>;$config['MasterServer']['port'] = 3306;

I did not do any thing, but my forum is not working..
Is there anything i have to do still?

And an email is dispatched with the following content:
Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to MySQL server on 'newipaddress' (10061)
c:\WebSites\forums\includes\class_core.php on line 273

Do i have to do any thing else other than changing that one line in config.php file???

Pls help...