Note: According to Filezilla forum, by default FileZilla automatically does not trust any certificate. TLSCACertificateFile /usr/local/psa/admin/conf/httpsd.pem The additional ProFTPd configuration file /etc/proftpd.d/nf will be created with the following content:

# echo -e “nnTLSCACertificateFile /usr/local/psa/admin/conf/httpsd.pemnn” > /etc/proftpd.d/nf Warning: It is required to run the full command, make sure it is copied and pasted fully. Note: Subscribe to this article to get notified once a fix will become available ResolutionĬreate an additional ProFTPd configuration file /etc/proftpd.d/nf with the following command: This is Plesk bug with ID #PPPM-6559 which will be fixed in future Plesk updates. Unable to upload the backup to the external storage: Unable to set backup sign certificate * Where is the Plesk hostname protected with a valid SSL certificateĮrror when using FileZilla client: Error: The data connection could not be established: ECONNREFUSED - Connection refused by serverĮrror when transferring data using lftp utility: Certificate: CN= Issued by: C=US,O=Let's Encrypt,CN=Let's Encrypt Authority X3 WARNING: Certificate verification: Not trustedĪ backup configured to the remote FTP server over FTPS fails with the following error: Verify error:num=21:unable to verify the first certificate Verify error:num=27:certificate not trusted Verify error:num=20:unable to get local issuer certificate # openssl s_client -showcerts -starttls ftp -servername -connect :21 SSL Certificate Chain Not Trusted (External Scan)Ĭhecking FTPS connection with OpenSSL utility shows the following error:

One of the following errors might be shown when performing a PCI compliance scan: SSL Certificate is Not Trusted (External Scan) Please carefully examine the certificate to make sure the server can be trusted.įatal Error: Certificate verification: Not trusted One of the following errors might be shown when accessing a server via FTPS: The server's certificate is unknown. # egrep -Ri TLSCACertificateFile /etc/proftpd.* In the ProFTPd configuration files the parameter TLSCACertificateFile is missing: Plesk and the FTP server are secured with a valid SSL certificate.

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