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Witch Port i must open on my Firewall to connect to a Oracle Database.

When i make the connect over my internal IP-Adress, it works
A connection to my Oracle Database over a official IP-Adress with oradirectmobile, dont work.

My Database use the standard Port 1521.

Pleas help me.

First connection takes place on port 1521. Then OraDirect .NET Mobile, like other Oracle client, uses dynamically assigned port. Then Oracle server determines another port for further communication. Then OraDirect .NET reconnects using this port.
You can configure MTS dispatcher on Oracle server to use single port for further communication.