Socket error coming and write log file for cloud's response

Question

Hello everyone,

We have a cloud application in angular 6(client)  and MVC 5 (server).

From last 4-5 days our clients are complaining that our application is not running. 

some clients are accessing API for searching. and they are getting error

 

SocketError: Failed to open TCP connection to :443 (getaddrinfo: No address associated with hostname) 

 

can you help  why this error is coming? Our clients are getting this error once in a while but mostly on sunday.

We contacted service provider they are saying this is not their error and check your code etc. 

So we want to maintain log file in which we will log all responsens from server. 

So how to do that? Any help would be appreciated. 

Thank you