Symptoms
- When accessing Plesk, the following error appears in a browser:
Service Unavailable.
HTTP Error 503. The service is unavailable.- The PleskControlPanel application pool at IIS Manager > hostname > Application Pools is stopped. After starting it manually, the application pool stops on the next attempt to open Plesk in a browser.
- The following error messages appear in the Event Viewer > Windows Logs > Application:
The worker process for application pool 'PleskControlPanel' encountered an error
'Cannot read configuration file due to insufficient permissions
' trying to read configuration data from file '?\C:\inetpub\temp\apppools\PleskControlPanel\PleskControlPanel.config', line number '0'.
The data field contains the error code. - The following articles do not solve the issue Plesk for Windows Server shows 503 Service Unavailable: Cannot read configuration file or How to reconfigure the PleskControlPanel website in IIS
Cause
Lack of permissions for the psaadm user for C:\Inetpub\temp location.
Resolution
- Connect to a Plesk server via RDP.
- On Windows Explorer, right-click on C:\Inetpub\temp;
- Go to Properties > Security (tab) > Advanced >s elect psaadm > click on Edit;
- Make sure that its NTFS permissions are set as follows:
(https://pix.cobrasoft.org/images/2024/01/02/mceclip0-7.png)
Note: In case there is an explicit Deny enabled for the psaadm user or it is inherited, remove it and disable inheritance.
5.Start the PleskControlPanel application pool at IIS Manager > hostname > Application Pools;
6.Access Plesk