Can not use port 443 for Management API

[kampanatm]

Hi guy,

I'd try to configuring TLS for the Management API on my Apigee Private Cloud Environments.

Refer to this document :
https://docs.apigee.com/private-cloud/v4.18.05/configuring-ssl-management-api

After the configurations I can successfully connect to port 8443 by this management-server.properties fileout put shown on following picture

but when I change the configurations from port 8443 to port 443 it not work anymore.

conf_webserver_ssl.enabled=true
# Leave conf_webserver_http.turn.off set to false
# because many Edge internal calls use HTTP.
conf_webserver_http.turn.off=false
conf_webserver_ssl.port=443 # change from 8443 to 443
conf_webserver_keystore.path=[MY JKS PATH]
# Enter the obfuscated keystore password below.
conf_webserver_keystore.password=OBF:[My Password]
conf_webserver_cert.alias=management_api

I also check the netstat that there does not have other service using port 443

Is it can possible to use port 443 on management api ?

and how I Investigate the error log of this case ?