Peer to Peer setting

[nehac]

I have developed a vb.net application. My application is on one PC and the database is on another PC . The configuration of the two PCs is peer-to-peer. I have given the IP address alongwith the database path in the config file of my application for the connection string. The application is not accessing the database and is giving an object reference error.
When I type the IP address of the PC which has the database in the "Run" option( this i'm doing on the PC which has my application), it is popping a password window. Both the PCs don't have a password. If anyone can tell me what is the issue then that wud be great. Thanks

[mldisibio]

Please explain:
- what database you are connecting to (Sql Server, MySql, Access)?
- please post what your connectionStrin gs section in app.config looks like;
- please post the section of code where you attempt to open and connect to the database;