I'm trying to connect to a forwarded serial port ( RDP / TS session ) but i get the error "invalid function". The application that is trying to open up the port, is written in .Net version 2 using the serialport class, but i also tried opening it with hyperterminal, also without succes. After failing to do it with the RDP session i start testing on the local machine but this also gives me no connection. Now i don't know for sure that the permissions are set correctly for the account, if anyone could point me out to some documention or could tell me where i could find those settings , so that i could rule that out , would be nice. Or better , if someone knows the real cause of an "invalid function" error.