Connecting to ftp - from a Windows Server 2012 - it works both secure (-over tls) and unsecure. From a Windows 7 it succeeds unsecure but fails when secure. (Using explicit TLS and passive mode.)
- 234 AUTH command ok. Expecting TLS Negotiation.
- Initializing TLS...
- Connection timed out
I've tried many things but nothing helps. (I'm also trying this programmatically. For details see: https://stackoverflow.com/questions/25393716/ftp-ssl-fails-after-expecting-tls-negotiation )
The fact that it does succeed from one computer proves that the ftp server is fine. And the fact that the Windows 7 computer succeeds without tls proves that it's not a NAT/firewall problem (besides, it failed even after disabling firewall etc.). I'm not sure where to start looking. Perhaps a difference between PC Windows and Windows Server?
The ftp server is on a Windows Server 2012.