Unable to access Plesk after dist-upgrade: blank page is shown

Renan Poss Moreira

Updated January 13, 2026 18:46

Plesk for Linux kb: technical

Applicable to:

In an attempt to access the Plesk login page after the dist-upgrade, the blank page is shown.
The following errors can be found in the browser developers console (F12):

CONFIG_TEXT: ReferenceError: Jsw is not defined

CONFIG_TEXT: Failed to load resource: the server responded with a status of 404 (Not Found)

There were some issues during the upgrade procedure - some Plesk packages are not installed from new repositories yet.

Apply one of the solutions below:

Plesk for Linux

Connect to the server via SSH.
Execute the command below to complete the upgrade procedure:

# plesk installer update
In case the issue still persists, run the command again:

# plesk installer update
If the previous command fails with the "Installation will not continue" message, run packages reconfiguration:

# dpkg --configure -a

Plesk for Windows

Log into the server via RDP.
Start a command prompt as an Administrator.
Execute the command below to complete the Plesk upgrade process:

C:\> plesk installer update