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Plesk is not accessible: Failed opening required 'auth.php'

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Benjamin Wessel
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Plesk for Linux DoNotDelete:docref kb: technical ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

After a Plesk installation or a Plesk upgrade, the following error is shown on the login page:

Warning : Unknown: failed to open stream: No such file or directory in Unknown on line 0
Fatal error: Unknown: Failed opening required 'auth.php' (include_path='.;C:\php\pear') in Unknown on line 0

Cause

Missing symbolic link /usr/local/psa/ -> /opt/psa/.

Resolution

  1. Connect to the server using SSH

  2. Remove the link /usr/local/psa if there is any:

    # unlink /usr/local/psa

  3. In case of error unlink: cannot unlink '/usr/local/psa': Is a directory rename the directory directory /usr/local/psa :

    # mv /usr/local/psa{,.bak}

  4. Create a symbolic link /usr/local/psa/ -> /opt/psa/:

    # ln -s /opt/psa /usr/local/psa

  5. Reinstall Plesk updates as described in the article How to update Plesk

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