Fixes a class cast exception with dns event fire.

src/net/java/sip/communicator/plugin/reconnectplugin/ReconnectPluginActivator.java

@@ -413,8 +413,6 @@ private void handleProviderRemoved(ProtocolProviderService provider)
      */
     public synchronized void configurationChanged(ChangeEvent event)
     {
-        String ifaceName = (String)event.getSource();
-
         if(event.getType() == ChangeEvent.IFACE_UP)
         {
             // no connection so one is up, lets connect
@@ -438,10 +436,12 @@ public synchronized void configurationChanged(ChangeEvent event)
                 needsReconnection.clear();
             }
 
-            connectedInterfaces.add(ifaceName);
+            connectedInterfaces.add((String)event.getSource());
         }
         else if(event.getType() == ChangeEvent.IFACE_DOWN)
         {
+            String ifaceName = (String)event.getSource();
+
             connectedInterfaces.remove(ifaceName);
 
             // one is down and at least one more is connected

src/net/java/sip/communicator/service/sysactivity/event/SystemActivityEvent.java

@@ -108,4 +108,13 @@ public int getEventID()
     {
         return this.eventID;
     }
+
+    /**
+     * Returns a String representation of this SystemActivityEvent object.
+     *
+     * @return  A a String representation of this SystemActivityEvent object.
+     */
+    public String toString() {
+        return getClass().getName() + "[eventID=" + eventID + "]";
+    }
 }