Problem routing to gateway hostname

Document ID : KB000107564
Last Modified Date : 23/07/2018
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I get the following error when I published a service in the gateway for ssg/ping

Problem routing to https://<gateway_hostname>:8443/ssg/ping. Error msg: Unable to obtain HTTP response from https://<gateway_hostname>:8443/ssg/ping: Unknown host: <gateway_hostname>: Name or service not known
Ensure that the gateways hostname is listed in the /etc/hostfile. Also check permissions for /etc/hosts file is set to 644