Please review / follow the steps below:
• If you have some firewall that only allows standard SSL connections on port 443, then it might be blocking the Aria Logs API which works on 9543.
• Execute the command given below and make sure you get HTTP 401(Unauthorized) in the response rather than connectivity errors.
curl -k -v https://<_Skyline Collector’s IP address or FQDN_>:9543/api/v2/version