No such host is known socket connection

Question

I\'m trying to work with this library for telnet connections. I have called the function correctly and it executes the code below but fails giving the following error:

Answer 1

Related but rare/fringe case: I was getting this same error in my C# .NET 4.7.2 web app (calling a http endpoint) because the machine I was on (a Parallels Win10 VM) had silently lost its network connection (no internet) due to some Parallels bug. Once I disabled and re-enabled the network adapter the error went away. /eyeroll