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Friday, April 22, 2016

The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

You may encounter the following error message when using the L2TP/IPSec VPN Client that is native to the Windows Operating System: "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer."  This error message typically occurs when you are using the wrong Pre-Shared Key for your L2TP VPN.  This error message can occur when other components of your configuration are incorrect but the first thing to confirm is that you are using the correct Pre-Shared Key.

If you are using the wrong Pre-Shared Key, the L2TP VPN connection will say Connecting for a long period of time and then display the error message: "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer."

If you are using the wrong username or password, the L2TP VPN will immediately respond with: "The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server."

If you are using the correct username, password and pre-shared key, the VPN connects immediately.

If you found this information helpful, please consider linking to Eugene Computer Services.

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Wednesday, September 16, 2015

How do you Remote Desktop to a computer using an L2TP VPN?

To Remote Desktop to a computer using an L2TP VPN:

These steps may be slighly different on your computer depending upon which version of Windows you are using.
  1. Click Start - All Programs.

  2. Click Accessories.

  3. Click Remote Desktop Connection.

  4. In the Computer field, enter the IP Address of the computer or the Fully Qualified Domain Name (FQDN) of the computer you wish to control.

  5. Click Connect.

  6. Enter the username and password you use to login to the computer.

If you found this information helpful, please consider linking to Eugene Computer Services.

Donations are greatly appreciated.

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How do you disconnect from an L2TP VPN using Microsoft Windows?

To disconnect from an L2TP VPN using Microsoft Windows:

These steps may be slightly different on your computer depending upon which version of Windows you are using.
  1. Click Start - Control Panel.

  2. Click Network and Sharing Center.

  3. Click Change Adapter Settings.

  4. Double-click the VPN Connection.

  5. Click Disconnect.

If you found this information helpful, please consider linking to Eugene Computer Services.

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How do you connect to an L2TP VPN using Microsoft Windows?

To connect to an L2TP VPN using Microsoft Windows:

These steps may be slighly different on your computer depending upon which version of Windows you are using.
  1. Click Start - Control Panel.

  2. Click Network and Sharing Center.

  3. Click Change Adapter Settings.

  4. Double-click the VPN Connection.

  5. Click Connect.

If you found this information helpful, please consider linking to Eugene Computer Services.

Donations are greatly appreciated.

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How do you setup L2TP VPN Windows Domain DNS using the Watchguard XTM-25 Web UI?

To setup L2TP VPN Windows Domain DNS using the Watchguard XTM-25 Web UI:
  1. Browse to the Watchguard XTM Web UI.

  2. Click Network.

  3. Click Interfaces.

  4. Below DNS Servers in the DNS Server field, enter the IP Address of the Windows Domain Controller.  Insure this IP Address is the first in the list.

  5. Below this, enter the Primary and Secondary DNS Servers from your ISP.

  6. Click Save. 
When connected to the L2TP VPN, you will have to use the Fully Qualified Domain Name (FQDN) ala host.domain.suffix to access the Computer inside the Windows Domain.  Example: computer01.mydomain.com.  

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How do you configure wireless using the Watchguard XTM-25 Web UI?

To configure wireless using the Watchguard XTM-25 Web UI:
  1.  Browse to the Watchguard XTM Web UI. 

  2. Click Network.

  3. Click Wireless.

  4. Select Enable Wireless.

  5. Select Enable Wireless Access Points.

  6. Click Configure next to Access Point 1 Enabled.

  7. Click Enable Access Point 1.

  8. From interface type drop down list, select Optional.

  9. In the IP Address field, enter the IP Address.

  10. Below Address Pool, click add and enter the Start IP and End IP.

  11. Click the Wireless tab.

  12. In the Network Name (SSID) field, enter the SSID.

  13. From the Encryption drop-down list, select WAP/WAP2 (PSK).

  14. In the Passphrase field, enter the passphrase.

  15. Click the DNS/WINS tab.

  16. In the DNS Server field, enter the DNS Server IP Address.

  17. Click Add.

  18. Click Return to Main Page.

  19. Click Save.

If you found this information helpful, please consider linking to Eugene Computer Services.

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How do you create a Watchguard L2TP VPN adapter using Microsoft Windows?

To create a Watchguard L2TP VPN adapter using Microsoft Windows:

These steps may be slighly different on your computer depending upon which version of Windows you are using.
  1. Click Start - Control Panel.

  2. Click Network and Sharing Center.

  3. Click Setup a new connection or network.

  4. Select Connect to a workplace.

  5. If prompted, select No create a new connection.

  6. Click Next.

  7. Select Use my Internet connection (VPN).

  8. In the Internet Address field, type the Public IP Address of the Watchguard.

  9. In the Destination field, give the connection a name.

  10. If it is visible at the bottom, check the field that says Don't connect now; just set it up so I can connect later.

  11. Click Create.

  12. Click Change Adapter Settings.

  13. Right-mouse click the connection you have created and select Properties.

  14. Click the Security tab.

  15. From the drop down list below Type of VPN, select Layer 2 Tunneling Protocol with IPsec (L2TP/IPsec).

  16. Click Advanced Settings.

  17. Select Use preshared key for authentication.

  18. In the Key field, enter the preshared key.

  19. Click OK.

  20. Click OK.
Please do not remove or delete this VPN connection.

If you found this information helpful, please consider linking to Eugene Computer Services.

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How do you add users to an L2TP VPN using the Watchguard XTM-25 Web UI?

To add users to an L2TP VPN using the Watchguard XTM-25 Web UI:
  1.  Browse to the Watchguard XTM Web UI. 

  2. On the left-hand side, click Authentication.

  3. Click Servers.

  4. Click Firebox.

  5. Below Firebox Users, click Add.

  6. In the name field, enter the username..

  7. In the passphrase field, enter a passphrase/password for the user.

  8. In the confirm field, enter the passphrase/password again.

  9. Place a checkmark in the field next to L2TP-Users.

  10. Click OK.

  11. Click Save.

If you found this information helpful, please consider linking to Eugene Computer Services.

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