Knowledge Base

Article 2597

SSL/TLS not working with Windows Vista

Problem
Unable to establish an SSL/TLS session on Windows Vista to some FTP servers. For example Netware. In this case the log may look like this:
[06:55:58] Connected to ftp.host.tld.
[06:55:58] 220 Service Ready for new User
[06:55:58] AUTH TLS
[06:55:59] 234 Enabling SSL
[06:55:59] Connected. Exchanging encryption keys...
[06:56:58] An established connection was aborted by the software in your host machine.

Reason
By default SSL 2.0 is disabled on Windows Vista for security reasons.

Workaround
Enable SSL 2.0 by editing the registry. Set the DisabledByDefault value to 0.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\Schannel\Protocols\SSL 2.0\Client
DisabledByDefault DWORD 0x00000000

Keywords
ssl, tls, 2.0, netware

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