Clears the default DNS cache when supplied records for primary server changed.

src/net/java/sip/communicator/impl/protocol/jabber/FailoverConnectionMonitor.java

@@ -242,6 +242,9 @@ public void run()
                 if(isConnectedToPrimary(currentRecords))
                     return;
 
+                // Clear DNS cache.
+                NetworkUtils.clearDefaultDNSCache();
+
                 SRVRecord srv = getPrimaryServerRecord(currentRecords);
 
                 ConnectionConfiguration confConn = new ConnectionConfiguration(

src/net/java/sip/communicator/util/NetworkUtils.java

@@ -1462,4 +1462,13 @@ private static void moveSelectedSRVRecord(
             }
         }
     }
+
+    /**
+     * Clears the default DNS cache.
+     */
+    public static void clearDefaultDNSCache()
+    {
+        Cache defaultCache = Lookup.getDefaultCache(DClass.IN);
+        defaultCache.clearCache();
+    }
 }