ftp-client works fine. ftp-tls-client fails on one computer and works on another

Posted by ispiro on Super User See other posts from Super User or by ispiro
Published on 2014-08-20T18:57:05Z Indexed on 2014/08/20 22:23 UTC
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Filed under:

windows-7

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networking

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ftp

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ssl

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filezilla

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.)

filezilla:

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: http://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?

EDIT

The ftp server is on a Windows Server 2012.

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