SharePoint Web Services Round Robin Service Load Balancer Event: EndpointFailure @Search@

I have problem for search query

SharePoint Web Services Round Robin Service Load Balancer Event: EndpointFailure

Process Name: w3wp

Process ID: 6380

AppDomain Name: /LM/W3SVC/245640041/ROOT-1-130730436306268804

AppDomain ID: 2

Service Application Uri: urn:schemas-microsoft-com:sharepoint:service:bb02eeee95db4a739db7abfde2c6b852#authority=urn:uuid:5bc47fecc9ea4bf3b0b9af8ceb3b112b&authority=https://server1:32844/Topology/topology.svc

Active Endpoints: 4

Failed Endpoints:1

Affected Endpoint: http://server1:32843/bb02eeee95db4a739db7abfde2c6b852/SearchService.svc

The Execute method of job definition Microsoft.Office.Server.Search.Monitoring.TraceDiagnosticsProvider (ID ef82820a-9558-4552-a79b-a4687962a4ac) threw an exception. More information is included below. 

Could not connect to http://server1:32843/ebb375e1ec96450b8f1c233dede1319f/SearchService.svc. TCP error code 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.x.x.x:32843. 

An exception occurred when trying to issue security token: An error occurred while receiving the HTTP response to http://server1:32843/bb02eeee95db4a739db7abfde2c6b670/SearchService.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details..