Hello, I have a code, which opens persistent (connected, see: http://twistedmatrix.com/documents/current/core/howto/udp.html#auto2) UDP connections, and sends and receives data on them. The problem is that occasionally I receive ICMP 13 (administratively prohibited) errors from the destinations, which triggers and exception and closes the UDP socket. I would like to keep that open, no matter what happens. On FreeBSD the exception comes during writing into the socket with transport.write, so this is an easy one. But on Linux it's a little bit harder, because there I get exception not during writing, but reading, which is handled here: http://twistedmatrix.com/trac/browser/tags/releases/twisted-9.0.0/twisted/in... The exception looks like this: 2010-02-08 12:09:15+0100 [-] reactor class: twisted.internet.selectreactor.SelectReactor. 2010-02-08 12:10:22+0100 [__builtin__.connectedUDP (UDP)] Unhandled Error Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/Twisted-9.0.0_r27775-py2.6-linux-x86_64.egg/twisted/python/log.py", line 84, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "/usr/lib64/python2.6/site-packages/Twisted-9.0.0_r27775-py2.6-linux-x86_64.egg/twisted/python/log.py", line 69, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "/usr/lib64/python2.6/site-packages/Twisted-9.0.0_r27775-py2.6-linux-x86_64.egg/twisted/python/context.py", line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "/usr/lib64/python2.6/site-packages/Twisted-9.0.0_r27775-py2.6-linux-x86_64.egg/twisted/python/context.py", line 37, in callWithContext return func(*args,**kw) --- <exception caught here> --- File "/usr/lib64/python2.6/site-packages/Twisted-9.0.0_r27775-py2.6-linux-x86_64.egg/twisted/internet/selectreactor.py", line 146, in _doReadOrWrite why = getattr(selectable, method)() File "/usr/lib64/python2.6/site-packages/Twisted-9.0.0_r27775-py2.6-linux-x86_64.egg/twisted/internet/udp.py", line 109, in doRead data, addr = self.socket.recvfrom(self.maxPacketSize) socket.error: [Errno 113] No route to host I wonder what is the preferred way of achieving that the socket will be write()-able and kept open regardless what ICMP or other sending or receiving error occurs? Thanks,