With the release of the new PCI DSS requirements which forbid the use of SSL 2.0 and PCT 1.0 for online transactions PCT 1.0 and SSL 2.0 must be must be disabled on all websites which handle the transfer of sensitive financial information in order to prevent a user from inadvertently using these protocols. To do that on your Microsoft IIS copy the entrys from the following section to a *.reg file and run in on your windows OS.

Windows 2003:

Windows Registry Editor Version 5.00

; Disable PCT 1.0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server]
"Enabled"=dword:00000000

; Disable SSL 2.0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server]
"Enabled"=dword:00000000

; Disable weak ciphers
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\DES 56/56]
"Enabled"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC2 40/128]
"Enabled"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 40/128]
"Enabled"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 56/128]
"Enabled"=dword:00000000

Windows 2008:

Windows Registry Editor Version 5.00

; Disable PCT 1.0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server]
"Enabled"=dword:00000000

; Disable SSL 2.0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server]
"Enabled"=dword:00000000

; Disable weak ciphers
REG ADD "HKLM\System\CurrentControlSet\Control\SecurityProviders\SChannel\Ciphers\RC2 128/128"
REG ADD "HKLM\System\CurrentControlSet\Control\SecurityProviders\SChannel\Ciphers\RC4 128/128"
REG ADD "HKLM\System\CurrentControlSet\Control\SecurityProviders\SChannel\Ciphers\Triple DES 168/168"

You need to restart your Server to get the changes up and working!

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