https://www.siteground.com/kb/check-port-blocked-isp/
Or, call their helpdesk, complain that you can't access certain port on you PC at home from outside (never mention server, FTP, or any server-related services. Just ports....). Prepare lists of ports for easier references....
Outbound FTP on maxis fibre, keep getting timed out
Mar 29 2018, 10:53 PM
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