The only thing I can think of is that it's a dependancy issue. Try delaying the startup of the service until windows is completely booted.
good luck On Jun 18, 8:08 am, James Lamanna <[email protected]> wrote: > Hi, > I have a service written in C# that interacts with the serial port. > On the startup of the computer, the service cannot open the serial > port. .Open() returns with an UnauthorizedAccessException. > However, if I restart the service once I log in, everything is fine. > Can someone explain why this might be the case? This seems to only be > a property of the SerialPort object. > I believe using CreateFile() through p/Invoke works... > > Thanks.
