workaround https://github.com/crossbario/autobahn-python/issues/1151

src/allmydata/web/_autobahn_1151.py

@@ -0,0 +1,27 @@
+"""
+Implement a work-around for <https://github.com/crossbario/autobahn-python/issues/1151>.
+"""
+
+
+from __future__ import (
+    print_function,
+    unicode_literals,
+    absolute_import,
+    division,
+)
+
+
+from autobahn.websocket.protocol import WebSocketProtocol
+_originalConnectionLost = WebSocketProtocol._connectionLost
+
+def _connectionLost(self, reason):
+    if self.openHandshakeTimeoutCall is not None:
+        self.openHandshakeTimeoutCall.cancel()
+        self.openHandshakeTimeoutCall = None
+    return _originalConnectionLost(self, reason)
+
+def patch():
+    """
+    Monkey-patch the proposed fix into place.
+    """
+    WebSocketProtocol._connectionLost = _connectionLost

src/allmydata/web/logs.py

@@ -18,6 +18,11 @@ from twisted.web.resource import (
     Resource,
 )
 
+# Hotfix work-around https://github.com/crossbario/autobahn-python/issues/1151
+from . import _autobahn_1151
+_autobahn_1151.patch()
+del _autobahn_1151
+
 
 class TokenAuthenticatedWebSocketServerProtocol(WebSocketServerProtocol):
     """