Hi Lesly,
I have looked at this article but it doesnt fit. Security groups for the mgmt ec2 are deployed as per template and have the 3 required ports open. Instance used to connect via SC is in the same subnet as Mgmt EC2 and has access on all ports to Mgmt host.
[Expert@mgmt-tf:0]# ss -ntlp | grep '18264\|19009\|18190'
LISTEN 0 20 *:18190 *:* users:(("fwm",pid=5517,fd=42))
LISTEN 0 5 *:18264 *:* users:(("cpca",pid=8137,fd=11))
LISTEN 0 50 *:19009 *:* users:(("java",pid=5802,fd=462))
[Expert@mgmt-tf:0]# curl_cli https://checkpoint.com
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.