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A program made with D6 and MyDAC runs fine.
The Server is somewhere on the internet and has 3307 open for clients.
At some places I can make contact with the server and on other places not.

I am not supposed to look at people's firewall especialy if the client is in a LAN
Can you tell me which port is used on the client side?
Should the firewall be configured to make a forwarding to that port on the client.
Thanks for your help
Teunis

We use Winsock.Connect function to establish connection via network. It allocates port on the local host. You can check local port using any tool to analyze TCP/IP ports.
As a rule firewall allows you to specify application name to allow/refuse connecting to internet.