Hello there,
This error usually means that while processing the URL for the web server, the underlying network connection was unable to convert the name into an IP address.
There are several points that you need to check.
1.Check that the name is correctly sepcified
2.Verify that there is network connectivity as this is required to communicate with the DNS servers used to resolve a hostname
3.Check that the DNS server address is correct especially if they are configured statically
4.Check the firewall on server computer, try turn off your firewall which maybe block your program from accessing the internet
Hope this resolves your Query !!
--If the reply is helpful, please Upvote and Accept it as an answer–