Index: twisted/internet/abstract.py
===================================================================
--- twisted/internet/abstract.py	(revision 10698)
+++ twisted/internet/abstract.py	(working copy)
@@ -25,7 +25,7 @@
 import types, string
 
 # Twisted Imports
-from twisted.python import log, reflect
+from twisted.python import failure, log, reflect
 from twisted.persisted import styles
 
 # Sibling Imports
@@ -183,6 +183,19 @@
             self.startWriting()
             self.disconnecting = 1
 
+    def abortConnection(self):
+        """Close the connection immediately.
+
+        Call this to cause this FileDescriptor to lose its connection immediately;
+        the contents of the write buffer are discarded.
+        """
+
+        if self.connected:
+            self.stopReading()
+            self.stopWriting()
+            self.disconnecting = 1
+            self.connectionLost(failure.Failure(main.CONNECTION_ABORTED))
+
     def stopReading(self):
         """Stop waiting for read availability.
 
Index: twisted/internet/main.py
===================================================================
--- twisted/internet/main.py	(revision 10698)
+++ twisted/internet/main.py	(working copy)
@@ -40,6 +40,7 @@
 
 CONNECTION_DONE = error.ConnectionDone('Connection done')
 CONNECTION_LOST = error.ConnectionLost('Connection lost')
+CONNECTION_ABORTED = error.ConnectionAborted('Connection aborted')
 
 
 running = None
Index: twisted/internet/error.py
===================================================================
--- twisted/internet/error.py	(revision 10698)
+++ twisted/internet/error.py	(working copy)
@@ -189,6 +189,10 @@
         return s
 
 
+class ConnectionAborted(ConnectionLost):
+    """Connection was aborted"""
+
+
 class ConnectionFdescWentAway(ConnectionLost):
     """Uh""" #TODO