What is the meaning of -4039 error?

Question

I am trying to listen to the messages coming from the topic of the service bus created in the Azure Portal. I am using @azure/service-bus npm module to integrate the same in my Node.js application but getting the below mentioned error:

code: 'GeneralError', errno: -4039, port: 5671, syscall: 'connect'

I am looking for the guidance to know the issue. I have checked subscription, connection string, topic name as well as namespace multiple times and found that it is correct.