Symptoms
When accessing Linux File Manager, the following error is displayed:
Invalid backend configuration.
Readable volumes not available.
Cause
During the upgrade, the configuration files of ProFTPd as well as branding rewrite rules were changed.
Resolution
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/
is49152 65534
. It should be either modified according to the Firewall Guide to60000:65535
, or firewall must enable connections to the ports49152
to65534
.Make sure the
proftpd
service is running and listening the port21
:[root@web1 ~]# netstat -ntpl | grep ftp tcp 0 0 192.168.0.3:21 0.0.0.0:* LISTEN 19123/proftpd tcp 0 0 192.168.0.3:2021 0.0.0.0:* LISTEN 19123/proftpd