--- core/src/main/java/quickfix/mina/acceptor/AbstractSocketAcceptor.java (original)
+++ core/src/main/java/quickfix/mina/acceptor/AbstractSocketAcceptor.java
@@ -128,7 +128,7 @@
                 AcceptorSessionProvider sessionProvider = sessionProviders
                         .get(socketDescriptor.getAddress());
                 if (sessionProvider == null) {
-                    sessionProvider = new StaticAcceptorSessionProvider(socketDescriptor
+                    sessionProvider = new DefaultAcceptorSessionProvider(socketDescriptor
                             .getAcceptedSessions());
                 }
 
@@ -334,6 +334,8 @@
         sessionProviders.put(address, provider);
     }
 
+
+    // Leaving this here as it used by a unit test.
     static class StaticAcceptorSessionProvider implements AcceptorSessionProvider {
         private final Map<SessionID,Session> acceptorSessions;
 
@@ -345,4 +347,31 @@
             return acceptorSessions.get(sessionID);
         }
     }
+    
+
+    private class DefaultAcceptorSessionProvider
+        implements AcceptorSessionProvider
+    {
+        private final Map<SessionID,Session> acceptorSessions;
+        public DefaultAcceptorSessionProvider(Map<SessionID, Session> acceptorSessions)
+        {
+            this.acceptorSessions = acceptorSessions;
+        }
+        public Session getSession(SessionID sessionID)
+        {
+            Session session = acceptorSessions.get(sessionID);
+            if(session == null)
+                session = acceptorSessions.get(reduceSessionID(sessionID));
+            return session;
+        }
+        /**
+         * Remove the extra fields added to the session ID in QF-272.
+         */
+        private SessionID reduceSessionID(SessionID sessionID)
+        {
+            // Acceptors don't use qualifiers.
+            return new SessionID(sessionID.getBeginString(), sessionID.getSenderCompID(), sessionID.getTargetCompID());
+        }
+    }
+
 }
\ No newline at end of file