Plesk fails to install update: XML answer is already sent

Created:

2016-11-16 12:45:28 UTC

Modified:

2017-08-08 13:28:49 UTC

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Plesk fails to install update: XML answer is already sent

Applicable to:

  • Plesk 12.5 for Linux

Symptoms

  1. Plesk fails to install update with an error in /tmp/autoinstaller3.log :

    XML answer is already sent (try to send ''
  2. There are a lot of hung fail2ban processes:

    # ps -auxxf | grep fail2ban

Cause

Corrupted fail2ban installation.

Resolution

Stop/start fail2ban process:

# service fail2ban stop 
# service fail2ban start

In case it does not help, reinstall Fail2ban:

  1. Check that Fail2ban is removed from Plesk using autoinstaller
  2. Kill all hung fail2ban processes:

    # kill -9 <PID>
  3. Find and remove fail2ban package:

    # rpm -qa | grep fail2ban
    # rpm -e --nodeps fail2ban-0.9.2-centos6.15103017.noarch
  4. Install fail2ban if it needed through Plesk Installer:

    # /usr/local/psa/admin/bin/autoinstaller
  5. Install micro-updates:

    # /usr/local/psa/admin/sbin/autoinstaller --select-release-current --reinstall-patch --install-component base
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