- Plesk Onyx for Linux
During an attempt to open Plesk installer in
Tools & Settings > Updates & Upgrades
the following error occurs in a web browser:
CONFIG_TEXT: This site can’t be reached h2.cdn4.net took too long to respond.
- Amazon instance is used.
8447 port is filtered:
# nmap -p 8447 example.com
PORT STATE SERVICE
8447/tcp filtered unknown
8447 port used by Plesk installer is closed for the instance.
Open 8447 port according to Amazon documentation .