The problem may be caused by the gethostbyname method failure. Sockets
transport uses a host name and resolves it to a valid IP address, but
for some reason it's not possible on your PC. There is a workaround:
add a proper entry to your hosts file. You can check that
gethostbyname works by calling 'ping
machine_name_you_have_specified_in_debug_options'. If ping passes,
then debugger should work.