Multi-db remote server connection?

Hi,

I have two server.The first server is a web server and
I want to use the second server as the database server.

I'm using db tools

add_db_server('000', 'dc1', 1, 1,'myserverip','127.0.0.1', 'mydb_000', 'myrootuser',  'myrootpassword');
.
.
.

I think,I don't do any mistake.Because it works locally before and I'm sure my database server support remote connection.

Local Host DB: I left this blank,127.0.0.1,192.168.0.101 (I tried three)

but still didn't work

any idea?

Thanks.