I am java programmer. I am new to mac, but I have written java code for several years. there is a thing boring my for a long time since I move to mac. It is always take a long time to get a jdbc connection to a remote Oracle DB server. On mac: it takes 30 second, On windows, It only takes 0.30 second. It is unacceptable, I cant measure the real effeciency of the application. our application will run on unix or windows. I guess the reason maybe is about firewall or something, because when I connect to a local db server, there is not problem. If everyone know the reason, please help, thanks.