Roundcube error: "Invalid request! Information not saved"

Symptoms

When logging in to Roundcube, the error message appears: "Invalid request! No data was saved".

Causes

The PHP native version is set to something like session.cookie-domain.

Solution

• Go to "Settings" – "PHP Settings";
• Select the native version of PHP and click "Advanced Settings";
• Find the parameter session.cookie-domain and click "Change";
• In the tab that opens, clear the "Value" field and click "Save".

NOTE THAT!

If this parameter is necessary for the site to work, set it in the ".htaccess" file of the required site.