How to Disable Weak SSL Ciphers
- 1). Turn on your server and log in. Press "WIN" and "R" at the same time. "WIN" is the Windows logo key located next to the "Ctrl" key.
- 2). Type "regedit" into the Run dialog box and press "Enter." Click on the "+" to the left of the "HKEY_LOCAL_MACHINE" item and expand each folder in the left pane to the following path: "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL."
- 3). Highlight the SCHANNEL folder in the left pane. Select "File" from the menu bar and click "Export." Save the registry file to somewhere secure, such as the system drive.
- 1). Open the folder where you saved the .REG file. Right-click the .REG file and select "Edit." Highlight everything and press the "Delete" key.
- 2). Copy and paste the following into the .REG file:
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 - 3). Click on "File" and select "Save As." Name the file "Disable Ciphers.REG" and save it in the same folder as the original .REG file.
- 4). Open the folder the .REG files are saved in and double-click the Disable Ciphers.REG file. Confirm the registry addition box by selecting "Yes."
- 5). Confirm that everything still functions properly. Log out if the server is running properly. Use the original .REG file to restore the old registry settings if disabling the ciphers causes other issues.
Back up the Windows Registry
Disable the Weak SSL Ciphers
Source...