After setting up the service gateway following all the steps described in
Configuring a Service Gateway, you need to make sure that the following OpenSSL command works and shows the certificate successfully.
openssl s_client -connect {TCP_ROUTER_URL}:{TCP_ROUTER_PORT} -servername {GEMFIRE_LOCATOR_HOSTNAME}
If successful, your service gateway is setup properly.
Note: The information for the parameters for OpenSSL command can be found in the service key.