What could be the reasons for the error "name":"SSS_UNKNOWN_HOST" in Evertec payment integration?

Message:- "The host you requested null is unknown or cannot be found" while attempting to access the URL (IP address) of a payment device, with the observation of "Bad Request" error in the Wireshark network traffic?

Error : - {"type":"error.SuiteScriptError","name":"SSS_UNKNOWN_HOST","message":"The host you requested null is unknown or cannot be found.","id":"","stack":["runRequest(N/httpUtil)","suitelet(/SuiteBundles/Bundle 331064/NSPOS Evertec Sample.js:28)"],"cause":{"type":"internal error","code":"SSS_UNKNOWN_HOST","details":"The host you requested null is unknown or cannot be found.","userEvent":null,"stackTrace":["runRequest(N/httpUtil)","suitelet(/SuiteBundles/Bundle 331064/NSPOS Evertec Sample.js:28)"],"notifyOff":false},"notifyOff":false,"userFacing":false}