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Article ID: 132495, created on Apr 8, 2018, last review on Apr 26, 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 as well as branding rewrite rules were changed.


  • Make sure the firewall is configured according to the guide. Note: The default range for passive port in /usr/local/etc/proftpd_vhost_confs_pem/ is 49152 65534. It should be either modified according to the Firewall Guide to 60000:65535, or firewall must enable connections to the ports 49152 to 65534.

  • Make sure the proftpd service is running and listening the port 21:

    [root@web1 ~]# netstat -ntpl | grep ftp
    tcp        0      0*     LISTEN      19123/proftpd
    tcp        0      0*     LISTEN      19123/proftpd

5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07 dd79f16c76b9dca75205ab5e9f5465ea 1941880841f714e458ae4dc3d9f3062d

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