How to Disable SSL v2 and Weak Ciphers

Disable SSL v2

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.

Disable Weak Ciphers

In addition to disabling SSL 2.0, you can disable some weak ciphers by editing the registry in the same way. To speed up the process, you can paste the following in to a text file and name it disableWeakCiphers.reg, then double-click it.

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\DES 56/56]
"Enabled"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\NULL]
"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\RC2 56/128]
"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
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 64/128]
"Enabled"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server]
"Enabled"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server]
"Enabled"=dword:00000000 
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server]
"Enabled"=dword:00000000