phpinfo() page in Plesk does not open when SEO-safe 301 redirect is enabled: Unable to retrieve information about the PHP configuration

Nelson Leiva

Updated November 03, 2020 20:31

Plesk kb: fixed kb: bug ABT: Group B

Applicable to:

Permanent SEO-safe 301 redirect from HTTP to HTTPS is enabled in domain's Hosting Settings or rewrite rules for domain redirect exists, i.e. the following is defined in .htaccess file:

CONFIG_TEXT: <IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^test.php$ - [L]
RewriteRule . /test.php [L]
</IfModule>
When clicking View the phpinfo() page at Domains > example.com > PHP Settings, Plesk shows the following error message:

PLESK_ERROR: Unable to retrieve information about the PHP configuration

Product issue:

#PPPM-5027 "Unable to retrieve information about the PHP configuration"
Fixed in:
- Plesk Obsidian 02 July 2018 (fixed as PPP-31786)

Please consider updating the server:

If update is not possible for some reason the following workaround may be applied

Temporary solution:

Log into Plesk.
Temporarily disable the Permanent SEO-safe 301 redirect from HTTP to HTTPS option in Domains > example.com > Hosting Settings when checking phpinfo() through the PHP Settings page.
Temporarily remove Additional Apache Directives in Domains > example.com > Apache and Nginx Settings.
Temporarily rename .htaccess file in Domains > example.com > File Manager.
Click View the phpinfo() page at Domains > example.com > PHP Settings.

Alternatively, create phpinfo() page manually:

Note: rewrites should not block the access to the created file.

Log into Plesk.
Go to Domains > example.com > File Manager.
Click New > Create File and name it phpinfo.php. Click OK.
Open the file phpinfo.php and add the following content in it:

CONFIG_TEXT: <?php
phpinfo();
?>
Open the URL http://example.com/phpinfo.php in a browser to view the phpinfo page.