How to Disable SSL 2.0 and SSL 3.0 in IIS 7

Windows Server 2008 using IIS 7 allows SSL 2.0 and SSL 3.0 by default. Unfortunately, this means you will fail a PCI Compliance scan by default. To properly secure your server and ensure that you pass your PCI-DSS scans, you will need to disable SSL 2.0 and disable weak ciphers. In order to disable SSL 2.0 and SSL 3.0 in IIS 7 and make sure that the stronger TLS 1.0 is used, follow these instructions:

1. Click Start, click Run, type regedit, and then click OK.

2. In Registry Editor, locate the following registry key/folder:    
   HKey_Local_Machine\System\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols

3. Right-click on the SSL 2.0 folder and select New and then click Key. Name the new folder Server.

4. Inside the Server folder, click the Edit menu, select New, and click DWORD (32-bit) Value.

5. Enter Enabled as the name and hit Enter.

6. Ensure that it shows 0x00000000 (0) under the Data column (it should by default). If it doesn't, right-click and select Modify and enter 0 as the Value data.

7. Now to disable SSL 3.0, right-click on the SSL 3.0 folder and select New and then click Key. Name the new folder Server.

8. Inside the Server folder, click the Edit menu, select New, and click DWORD (32-bit) Value.

9. Enter Enabled as the name and hit Enter.

10. Ensure that it shows 0x00000000 (0) under the Data column (it should by default). If it doesn't, right-click and select Modify and enter 0 as the Value data.

11. Restart the computer.

12. Verify that no SSL 2.0 or SSL 3.0 ciphers are available at ServerSniff.net or the Public SSL Server Database

Note: This process is essentially the same on an IIS 6 (Windows Server 2003) machine. Normally, the Server key under SSL 2.0 will already be created so you will just need to create a new DWORD value under it and name it Enabled.

For more information, read Microsoft's Knowledge base article on how to disable SSL 2.0 and other protocols in IIS 7.