Can't load same database in different IP address

[eluser]Unknown[/eluser]
my ip.. 192.168.5.3

database server 192.168.5.212 and 10.10.2.2 (use SQL SERVER 2005)

i can load database from 192.168.5.212
but, i can't load the database from 10.10.2.2..

username and password are similar..
i only need change the hostname..

Code:

A Database Error Occurred

Unable to connect to your database server using the provided settings.

Filename: core/Loader.php

Line Number: 224