Follow along with the video below to see how to install our site as a web app on your home screen.
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You should allow access to autoinstall.plesk.com and any servers listed in your system package manager repositories configuration. Also don't forget to allow access to Plesk licensing server. IIRC, autoinstall.plesk.com points to CDN, so IP address may vary.
Kind of, yes. Though you should probably use OUTPUT chain, so it looks like:
iptables -A OUTPUT -d autoinstall.plesk.com -j ACCEPT
This kind of rule would suffice provided you accept established connections as well.
Let me quote iptables(8) man page: "Address can be either a network name, a hostname (please note that specifying any name to be resolved with a remote query such as DNS is a really bad idea), ...".
Also I advise to try out Plesk firewall extension for managing firewall configuration.