"No destination for Integration Server found" error in XI v3.0

Hi,

I've generated Java proxies as sender and I'm getting this error No destination for Integration Server found. It could be probably not correctly configured dbconnect.properties, but I really don't know what...

########################

hostname=s12set5

systemNumber=07

client=100

user=my_user_name

password=my_pwd

language=en

########################

can someone help me?

thanx, peter