Symptoms

After upgrade to 7.1 FileManager shows either blank page or returns the following error:

Invalid backend response.
Data is not JSON.

TLS is set up in the /etc/proftpd.h2e.conf file on the NG node, where the webspace is located:

<IfModule mod_tls.c>
        TLSEngine on
        TLSLog /var/log/h2e-ftp/tls.log
        TLSRequired off
        TLSRSACertificateFile /etc/proftpd-cert.h2e
        TLSVerifyClient off
</IfModule>

Cause

New TLS configuration was not applied during upgrade.

Resolution

Modify /etc/proftpd.h2e.conf file, adding following string:

TLSOptions NoSessionReuseRequired

Corresponding part of config should looks like:

<IfModule mod_tls.c>
        TLSEngine on
        TLSLog /var/log/h2e-ftp/tls.log
        TLSOptions NoSessionReuseRequired
        TLSRequired off
        TLSRSACertificateFile /etc/proftpd-cert.h2e
        TLSVerifyClient off
</IfModule>

After that restart the ProFTPD service:

# service proftpd restart

Internal content