Need help with SAM HTTP monitor

I tried to reproduce your problem on my env :

- http://${IP}:${PORT}/ >> Up

- http://${Node.Caption}:${PORT}/ >> [Errno -2] Name or service not known

- http://${Node.SysName}:${PORT}/ >> [Errno -2] Name or service not known

- http://${Node.DNS}:${PORT}/ >> [Errno -2] Name or service not known

- http://name_of_server:nb_of_port >> [Errno -2] Name or service not known

So only IP address works for me. Even if put the servername and port manually in url field if does not work

As an alternative to what Vinx has suggested, you could use PowerShell to emulate the check carried out by the HTTP Monitor template. Take a look at this cmdlet:

Test-Netconnection:

https://docs.microsoft.com/en-us/powershell/module/nettcpip/test-netconnection?view=win10-ps

Also, as for a longer read, check this article out, which goes into further detail on how PowerShell can help test web apps:

https://docs.microsoft.com/en-us/archive/msdn-magazine/2008/march/test-run-web-ui-automation-with-windows-powershell

The above might be overkill for what you're looking to achieve, but it might give you an idea or two!