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Article ID: 132495, created on Apr 8, 2018, last review on Apr 8, 2018

  • Applies to:
  • Operations Automation 7.3


When accessing Linux File Manager, the following error is displayed:

Invalid backend configuration.
Readable volumes not available.


During the upgrade, the configuration files of ProFTPd were overwritten. The new ProFTPd configuration file does not contain a directive specifying the range of passive ports in the TLS section.


Modify the configuration file in the directory /usr/local/etc/proftpd_vhost_confs_pem/ on the web server and add the line PassivePorts 49152 65534 as below:

    <IfModule mod_tls.c>
            TLSEngine on
            PassivePorts 49152 65534

Save the file and restart the service:

# service proftpd restart

5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07 dd79f16c76b9dca75205ab5e9f5465ea 1941880841f714e458ae4dc3d9f3062d

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