Thanks for your reply, Joseph-I am using exactly the same setting in Filezilla as on the Nvr. On Filezilla I can explicity chose between implicit/explicit mode. On the Nvr settings, there is no choice. As I can transfer files from Filezilla to the Ftp server without problem, I do not think that it is a Firewall problem. But good idea to use Wireshark (which I have not done before....) BTW - I also tried the same settings on a cam directly (810A). In this case even the test fails (code 453?)and no directories get created. So I assume that there are different implementations of FTPS on cams and the Nvr...

Does anybody have (positive) experience with uploading NVR recordings (RLN16-10) to an FTP Server using FTPS?
My issue (using an HiDrive FTP cloud server) that the NVR connects to the FTP server, writes directories (YYYY/MM/DD) to the FTP directory but does not transfer any files. Is there an issue with explicit FTPS ? Does Reolink only support implicit FTPS? Has anyone a positive experience with transferring videos/pics from the NVR (or directly from POE Cams) to a cloud FTP server (other than HiDrive)?

Many thanks,
Carl