Updated April 19, 2017
The following certificate error is displayed when browsing the FTP site on Android devices. Browsing on the desktop and on iOS devices does not generate the same error.
Your connection to this site is not private. Attackers might be trying to steal your information (for example, photos, password, messages and credit cards) from <your_site>)
All Serv-U MFT versions
The certificate chain is incomplete.
When you test the site, for example on https://www.ssllabs.com/ssltest/, it will instruct you to download missing certificates.This can be checked under Certificate Paths.
GlobalSign Extended Validation CA - SHA256.