If u're using version 10.05 and have the target type as 'native', that combination won't launch the debugger. It's been fixed some time before so pls try one of the latest nightlies of 'debugger branch' if u haven't yet. I don't have any experience with 'arm' but if u can be more specific about the problem someone more-experienced may help. Also u can try launching the '*gdb.exe' manually with appropriate command line options and try to see if it connects to the server. That may help diagnose the problem.