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Map_Soc failed

Can anyone help me. I am testing the Ethernet of the LPC2378 (V4.10, rlarm 4.05).

When I start-up my module with ethernet connected it all works well.

If I start-up without ethernet and connect it later, it will not work. I use a fixed IP number.

The debug TCP library reports:

TCP ERR: Map_Soc failed, No Free Sockets found
TCP ERR: Received Frame not mapped, Socket not found

Does anyone know where I can find an explanation of these errors?

Or how I can detect that the ethernet is not working?

Thanks

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