Unable to view domain logs in Plesk: Class ‘Plesk_Log_Timestamp’ not found

Symptoms

• Plesk Onyx 17.8 is used.

• The following error messages are seen when accessing Domains > example.com > Logs:

  Server Error
   500 
   Error 
   Class 'Plesk_Log_Timestamp' not found 
   Type Error 
   Message Class 'Plesk_Log_Timestamp' not found 
   File Log.php 
   Line 36

  OR

  Server Error
   500 
   PleskUtilException 
   Access Denied 
   Type PleskUtilException 
   Message Access Denied 
   File Windows.php 
   Line 556

  OR

  Type PleskFatalException
   Message Unable to open log file: Unable to execute application.
   File PleskFopen.php
   Line 80

  OR

  Server Error
   500 
   PleskFatalException 
   Unable to open log file: Unable to execute application.

• Rotated log files are accessible under %plesk_vhosts%example.comlogs...<logfilename>.zip and can be extracted/viewed;

• If rotated log files are removed from the log folder, Log Viewer opens fine.

Cause

Bug PPPM-8887.

Resolution

1. Log in to the server via RDP.
2. Download the archive from the attachment and unpack the file from it.
3. Make a backup of %plesk_dir%adminplibLogBrowserReaderPleskFopen.php.
4. Replace %plesk_dir%adminplibLogBrowserReaderPleskFopen.php with the unpacked file.