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Can't secure Plesk with Let's Encrypt: Invalid port in redirect target. Only ports 80 and 443 are supported, not 8443

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Pablo Alvarez
Updated
kb: technical ext: le Plesk Onyx for Linux ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

  • Let's Encrypt fails to secure the Plesk panel

    Invalid port in redirect target. Only ports 80 and 443 are supported, not 8443

  • The hostname used to access the panel isn't served by Plesk and is absent from the domains list

  • A redirect is configured in /var/www/vhosts/default/htdocs/.htaccess

    Redirect / https://example.com:8443/login_up.php3

Cause

Custom redirects configured for the Plesk hostname prevent Let's Encrypt from accessing the panel.

Resolution

  1. Connect to the server over SSH

  2. Edit /var/www/vhosts/default/htdocs/.htaccess and remove the redirect line

    # vi /var/www/vhosts/default/htdocs/.htaccess

  3. Follow this article to make Plesk accessible over a hostname: How to customize the Plesk URL

  4. Issue the Let's Encrypt certificate

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