Hi, I'm getting an error uploading a file : "The supplied message is incomplete. The signature was not verified". Looks like this could be related to : https://support.microsoft.com/en-us/kb/2888853 Forcing the use of FTP, i.e do not use TLS works around it. Maybe you can confirm if the hotfix mentioned is applied to your Windows 2012 servers? Thanks,
please open a support ticket Include FTP Client you are using FTP setting in a screenshot Error message screenshot