Login to Plesk from WHMCS redirects to Plesk login page instead of logging in.

Started by Suhitha, Sep 29, 2025, 05:47 AM

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Suhitha

Question: Login to Plesk from WHMCS redirects to Plesk login page instead of logging in.


Applicable to:

  • Plesk for Linux


Symptoms

  • SSO connection to Plesk though WHMCS fails. Login to Plesk from WHMCS redirects to Plesk login page back instead of logging in.
  • WHMCS is behind Cloudflare,


Cause

User's IP address is changed during a Plesk session. This may happen if user's IP address is dynamic or the domain/hostname which is used as a URL for Plesk is behind Cloudflare.

By default, Plesk does not allow IP address changes during a single session.


Resolution

Allow IP address changes during a single session:

1.Log in to Plesk (use the server IP address if it is not possible to log in using the hostname).

2.Go to Tools & Settings > Session Idle Time and enable the option Allow IP address changes during a single session.

3.Click OK to apply the changes.


                              Command-line instructions

1.Connect to the Plesk server via SSH (Linux) / RDP (Windows Server).

2.Run the following command to enable IP address changes during a single session (on Windows Server, start a command prompt as an Administrator):

# plesk bin settings --set disable_check_session_ip=true