It looks like the new ssl/tls code doesn't work with Foolscap. The ConnectionMixin is treating the self.protocol object as a transport and calls write() and loseConnection() on it. Here is a traceback: Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/slicers/root.py", line 107, in send d.callback(None) File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/defer.py", line 361, in callback self._startRunCallbacks(result) File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/defer.py", line 455, in _startRunCallbacks self._runCallbacks() File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/defer.py", line 542, in _runCallbacks current.result = callback(current.result, *args, **kw) --- <exception caught here> --- File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 216, in produce self.pushSlicer(slicer, obj) File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 352, in pushSlicer openID = self.sendOpen() File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 481, in sendOpen int2b128(openID, self.transport.write) File "/usr/lib64/python2.6/site-packages/foolscap-0.6.1_-py2.6.egg/foolscap/banana.py", line 24, in int2b128 stream(chr(0)) File "/usr/lib64/python2.6/site-packages/Twisted-11.0.0_r31548-py2.6-linux-x86_64.egg/twisted/internet/_newtls.py", line 176, in write self.protocol.write(bytes) exceptions.AttributeError: 'Broker' object has no attribute 'write' Any workarounds or suggestions? Reverting to Twisted 10.2 works for now. --Bill Noon Northeast Regional Climate Center Cornell University