REST Service -> HTML error communication

Hello! I hope you are well!

I am having a problem while consuming a REST service. I am using the class CL_REST_HTTP_CLIENT and I am having this exception in the SEND method (http_communication_failure)

Digging into the method I found this FM 'RFC_HOST_TO_IP' that it's seems to be the problem, inside this FM it's calling another one 'NI_NAME_TO_ADDR' that it returned the exception NIEHOST_UNKNOWN

Any suggestion will be very welcome! Thanks for reading!