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Unable to login to Plesk UI: a blank screen is shown

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Renan Moreira
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Plesk for Linux kb: technical ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

Cause

Master sw-engine process is hung.

Resolution

  1. Connect to the server using SSH.

  2. Kill all  sw-engine processes:

    # pkill -f sw-engine-*

  3. Run the the following command to show if there are any leftover process that were not killed in previous step, for example:

    # ps auxww | grep sw-engine
    psaadm 7478 0.1 0.6 322832 6576 ? S 05:41 0:00 sw-engine-kv
    root 7479 0.0 0.9 482148 10192 ? Ss 05:41 0:00 sw-engine-fpm: master process (/etc/sw-engine/sw-engine-fpm.conf)

  4. Kill the processes listed above:

    # kill -9 7478 7479

  5. Start the sw-engine service:

    # service sw-engine start

  6. Start the "Web-Socket" service as well:

    # service plesk-web-socket restart

Comments

5 comments

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  • Avatar
    Pier Paolo Ronzino

    I have the same problem but on Windows server

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  • Avatar
    Pier Paolo Ronzino (Edited )

    Here is my last php error logs, controlpanel ones

    [2022-02-23 13:07:21] PHP Fatal error:  require(): Failed opening required 'C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php' (include_path='C:\Program Files (x86)\Plesk\admin\plib\vendor/plesk/zf1/library;C:\Program Files (x86)\Plesk\admin\plib') in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:10:00] PHP Warning:  require(C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php): failed to open stream: No such file or directory in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:10:00] PHP Fatal error:  require(): Failed opening required 'C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php' (include_path='C:\Program Files (x86)\Plesk\admin\plib\vendor/plesk/zf1/library;C:\Program Files (x86)\Plesk\admin\plib') in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:12:21] PHP Warning:  require(C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php): failed to open stream: No such file or directory in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:12:21] PHP Fatal error:  require(): Failed opening required 'C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php' (include_path='C:\Program Files (x86)\Plesk\admin\plib\vendor/plesk/zf1/library;C:\Program Files (x86)\Plesk\admin\plib') in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:16:01] PHP Warning:  require(C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php): failed to open stream: No such file or directory in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:16:01] PHP Fatal error:  require(): Failed opening required 'C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php' (include_path='C:\Program Files (x86)\Plesk\admin\plib\vendor/plesk/zf1/library;C:\Program Files (x86)\Plesk\admin\plib') in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:17:21] PHP Warning:  require(C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php): failed to open stream: No such file or directory in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:17:21] PHP Fatal error:  require(): Failed opening required 'C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php' (include_path='C:\Program Files (x86)\Plesk\admin\plib\vendor/plesk/zf1/library;C:\Program Files (x86)\Plesk\admin\plib') in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:18:00] PHP Warning:  require(C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php): failed to open stream: No such file or directory in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70
    [2022-02-23 13:18:00] PHP Fatal error:  require(): Failed opening required 'C:\Program Files (x86)\Plesk\admin\plib\vendor\composer/../react/promise/src/functions_include.php' (include_path='C:\Program Files (x86)\Plesk\admin\plib\vendor/plesk/zf1/library;C:\Program Files (x86)\Plesk\admin\plib') in C:\Program Files (x86)\Plesk\admin\plib\vendor\composer\autoload_real.php on line 70

    And here is the code of autoload_real.php on line 70

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  • Avatar
    Mark Bailly

    I tried the above and I am still unable to access the plesk login. When I run the ps command one PID is listed. But when I try to kill it, I am told that the PID does not exist. So I skip that step and move on to the restart commands. Is the task that is still running preventing me from probably restarting the Plesk server? Why can I not kill a PID that is clearly shown in the list?

    Thanks,

    Mark

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  • Avatar
    Xyonet Hosting

    Still happening. looks like the server needs a reboot. that should never happen

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  • Avatar
    My Test

    Not help me

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