Article ID: 126474, created on Aug 7, 2015, last review on Jun 17, 2016

  • Applies to:
  • Plesk for Linux/Unix


Plesk is not accessible or goes on looping endlessly while accessing login page.

A nmap utility shows that port 8443 is blocked on server IP:

# nmap -Pn -p8443
Nmap scan report for (
Host is up (0.093s latency).
8443/tcp filtered https-alt

Nmap done: 1 IP address (1 host up) scanned in 0.18 seconds


Port 8443 which is used by Plesk user interface is blocked by firewall.


Allow connection to Plesk user interface by adding appropriate rule:

# iptables -I INPUT 2 -p TCP --dport 8443 -j ACCEPT

Please also check KB #391 to make sure all necessary ports are opened to provide full Plesk functionality.

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