Here on Windows, current CVS: C:\Code\python\PCbuild>python ../lib/test/test_asynchat.py Traceback (most recent call last): File "../lib/test/test_asynchat.py", line 58, in ? main() File "../lib/test/test_asynchat.py", line 53, in main c = echo_client() File "../lib/test/test_asynchat.py", line 34, in __init__ self.connect((HOST, PORT)) File "C:\CODE\PYTHON\lib\asyncore.py", line 311, in connect raise socket.error, err socket.error: 2 The DOS box is frozen at this point, but not accumulating any cycles. Worked 12 hours ago. What about Linux?