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Monday, 19 September 2011

How to disable PCT 1.0 and SSL 2.0 in IIS

IIS stores information about different security-enhanced channel protocols in the following registry key:

HKey_Local_Machine\System\CurrentControlSet\Control\SecurityProviders \SCHANNEL\Protocols

Typically, this key contains the following subkeys:

• PCT 1.0
• SSL 2.0
• SSL 3.0
• TLS 1.0

To disable a protocol, create a new DWORD value in the server subkey of the protocol. Set the DWORD value to "00 00 00 00". Reboot the server for changes to take effect.

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