Adding NegotiateDH2048_AES256 into Windows registry

By default Windows 7 up to Windows 11 propose only the weak modp1024 Diffie-Hellman key exchange algorithm that has been deprecated by NIST Special Publication 800-57 Part 3 Revision 1 since 2015:

ike = 3des-aes128-aes192-aes256-sha1-sha256-sha384-modp1024

Therefore, any attempt connect to IKEv2 VPN server, you will getting Policy match error message.

You will need to enable the modp2048 Diffie-Hellman group by adding the NegotiateDH2048_AES256 DWORD into the Windows registry using regedit.

Download following zip file:

NegotiateDH2048_AES256.zip

NOTE: You do not need to import this file again if you have already imported it, or if you have already upgraded your Diffie-Hellman group to 2048 bits.

If already upgraded to 2048 bits or already imported this file, do skip this and proceed to Setting IKEv2 VPN client section.

ADMINISTRATOR NOTE:

Merging NegotiateDH2048_AES256 into Windows registry will require administrator access privilege. If encounter following message, then you will need switch from current Windows user and login as administrator. Once merged into registry, you may switch back to your own Windows user.

Once downloaded, proceed to extract or decompress it. You should see one (1) NegotiateDH2048_AES256.reg file.

Double click on it to automatically merge NegotiateDH2048_AES256 into Windows registry.

Click Yes to continue

Click Ok to close the dialog box

Setting IKEv2 VPN client

Once NegotiateDH2048_AES256 added into your Windows registry, you are now ready to create a new IKEv2 VPN connection.

VPN information as stated below will be located within activation form email:

- VPN Server hostname
- User name
- Password

Create VPN connection

1. Select the Start  button, then select  Settings  > Network & Internet  > VPN > Add a VPN connection.

2. In Add a VPN connection, do the following:

• For VPN provider, choose Windows (built-in)
• For Connection name box, enter a name you'll recognize (for example, My Personal VPN). This is the VPN connection name you'll look for when connecting
• For Server name or address box, enter the address for the VPN server hostname
• For VPN type, choose IKEv2
• For Type of sign-in info, choose User name and password
• For User name (optional), enter your VPN user name
• For Password (optional), enter your VPN password
• Mark Remember my sign-in info

3. Click Save.

 Edit VPN connection properties

Once the VPN connection created, open its properties via Network Connections tool box.

1. Press Win + R to open the Run command dialog box.
2. Type ncpa.cpl and press Enter to open the Network Connections tool.

   3. Select the VPN connection you have created earlier and right-mouse on it to select Properties

   4. On Security tab, set Type of VPN to IKEv2.

   5. Ensure Authentication is set to Microsoft Secured password (EAP-MSCHAP v2) (encryption enabled).

   6. On Networking tab, make some changes to the VPN properties by following the order numbering

You are now ready connect to the IKEv2 VPN server. Select your VPN connection and click on Connect button

Connect to a VPN

1. On the far right of the taskbar, select the Network icon

2. Connect to IKEv2 VPN server you have created just now.

Once VPN connection no longer needed, select your VPN connection and click on Disconnect. This will end your VPN session.

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