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After loosing WLAN we get an error 'unable to write data to the transport connection' by trying to call a DB procedure.
Then we close the connection and open it again.
Open is without error - the parameter ConnectionState is 1.
When we then try to call the DB procedure we get the error 'unable to write data ... ' again.
What to do ?

We reproduced your problem and fixed it. This fix will be included in the next OraDirect .NET build.

Try to set Pooling=false to OracleConnection.ConnectionString as a workaround