diff --git a/autobahn/wamp/protocol.py b/autobahn/wamp/protocol.py
index 1fc12bb3..8ab43b45 100644
--- a/autobahn/wamp/protocol.py
+++ b/autobahn/wamp/protocol.py
@@ -39,7 +39,7 @@ from autobahn.wamp import role
 from autobahn.wamp import exception
 from autobahn.wamp.exception import ApplicationError, ProtocolError, SessionNotReady, SerializationError
 from autobahn.wamp.interfaces import ISession  # noqa
-from autobahn.wamp.types import SessionDetails
+from autobahn.wamp.types import SessionDetails, CloseDetails
 from autobahn.wamp.cryptobox import EncryptedPayload
 from autobahn.wamp.request import \
     Publication, \
@@ -1104,17 +1104,38 @@ class ApplicationSession(BaseSession):
         Implements :func:`autobahn.wamp.interfaces.ISession.onJoin`
         """
 
+    def _errback_outstanding_requests(self, exc):
+        """
+        Errback any still outstanding requests with exc.
+        """
+        for requests in [self._publish_reqs,
+                         self._subscribe_reqs,
+                         self._unsubscribe_reqs,
+                         self._call_reqs,
+                         self._register_reqs,
+                         self._unregister_reqs]:
+            for request in requests.values():
+                self.log.info('cleaning up outstanding {request_type} request {request_id}, firing errback on user handler {request_on_reply}',
+                              request_on_reply=request.on_reply,
+                              request_id=request.request_id,
+                              request_type=request.__class__.__name__)
+                txaio.reject(request.on_reply, exc)
+            requests.clear()
+
     @public
     def onLeave(self, details):
         """
         Implements :func:`autobahn.wamp.interfaces.ISession.onLeave`
         """
-        if details.reason.startswith('wamp.error.'):
-            self.log.error('{reason}: {wamp_message}', reason=details.reason, wamp_message=details.message)
+        if details.reason != CloseDetails.REASON_DEFAULT:
+            self.log.warn('session closed with reason {reason} [{message}]', reason=details.reason, message=details.message)
+
+        # fire ApplicationError on any currently outstanding requests
+        exc = ApplicationError(details.reason, details.message)
+        self._errback_outstanding_requests(exc)
 
         if self._transport:
             self.disconnect()
-        # do we ever call onLeave with a valid transport?
 
     @public
     def leave(self, reason=None, message=None):
@@ -1141,7 +1162,11 @@ class ApplicationSession(BaseSession):
         """
         Implements :func:`autobahn.wamp.interfaces.ISession.onDisconnect`
         """
-        pass
+        # fire TransportLost on any _still_ outstanding requests
+        # (these should have been already cleaned up in onLeave() - when
+        # this actually has fired)
+        exc = exception.TransportLost()
+        self._errback_outstanding_requests(exc)
 
     @public
     def publish(self, topic, *args, **kwargs):