diff --git a/slsDetectorSoftware/slsDetector/slsDetector.cpp b/slsDetectorSoftware/slsDetector/slsDetector.cpp
index a5ec53775..3a3a3be10 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetector.cpp
@@ -1321,6 +1321,26 @@ string slsDetector::checkOnline() {
       disconnectControl();
 #ifdef VERBOSE
       std::cout<< "online!" << std::endl;
+#endif
+    }
+  }
+  //still cannot connect to socket, controlSocket=0
+  if(stopSocket){
+    if (connectStop() == FAIL) {
+      stopSocket->SetTimeOut(5);
+      thisDetector->onlineFlag=OFFLINE_FLAG;
+      delete stopSocket;
+      stopSocket=NULL;
+      retval = string(thisDetector->hostname);
+#ifdef VERBOSE
+      std::cout<< "stop offline!" << std::endl;
+#endif
+    }  else {
+      thisDetector->onlineFlag=ONLINE_FLAG;
+      stopSocket->SetTimeOut(100);
+      disconnectStop();
+#ifdef VERBOSE
+      std::cout<< "stop online!" << std::endl;
 #endif
     }
   }