Failed to establish a backside connection-the bil timeout after n seconds

unable to find the root cause of the issue. The connection is getting timed out after 6000ms. But increasing it also is not helping.Can anybody please explain me whther a service is not hosted properly or something is wrong with the client requesting a service. Key points of the below logs :

>DatapowerLog timestamp="2018-08-01T15:03:44" logtype="bilError
>severity="Error" 
>errorcode="0x80000001" 
>srvc_error_code=0x01130006 srvc_error_subcode=0x00000000 error_text=error-code: 0x01130006 subcode: 0x00000000 
>The BIL timed out after 60000ms waiting for the response from the service .svc
>serviceErrorMsg=Failed to establish a backside connection
>Destination='B/UNSECURE/UTILITY/1BIL/Error/V1/ERROR'

Please find the logs below :

host=PROD_SRCH_03 Options|  
    sourcetype=bil_error Options|  
    source=/apps/Q_Reader/ErrorQueue/ErrorQueue_103.log Options|  
    error_message=perspective=Server operation=getSchedules srvc_error_code=0x01130006 srvc_error_subcode=0x00000000 
    error_text=error-code: 0x01130006 subcode: 0x00000000 The BIL timed out after 60000ms waiting for the response
    from https://XXXXYYYService.svc 
    message_id=xyz transactionId=xxx-yyyy-xxx-yyy 
    url=https://XXXXYYYService.svc 
    sslprofile=BackendSslProxyProfile 
    serviceErrorMsg=Failed to establish a backside connection Options
    Destination='B/UNSECURE/UTILITY/1BIL/Error/V1/ERROR'