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L2TP VPN Connection issue

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L2TP VPN Connection issue

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User52671

2024-05-16 15:14:17 - last edited 2024-05-31 00:56:02

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Registered: 2023-11-04

L2TP VPN Connection issue

2024-05-16 15:14:17 - last edited 2024-05-31 00:56:02

Tags: #VPN

Model: ER7206 (TL-ER7206)

Hardware Version: V1

Firmware Version: 1.2.3 Build 20221104 Rel.41500

Hi,

I have a TP-Link router (TL-ER7206) with L2TP VPN enabled behind my WAN internet router.

I would like to connect to my VPN from outside my LAN and to do this I have enabled port forwarding in my WAN router as per below (192.168.0.121 is the TP-Link router):

When I connect to the VPN from inside my LAN everything works correctly, but when I try to connect from outside, the connectivity gets stuck here:

Am I missing any other port in the list of the ports I need to forward?

Please let me know if you need more info.

Thanks

1 Accepted Solution

Libik

LV3

2024-05-29 17:39:35 - last edited 2024-06-05 18:14:07

Posts: 138

Helpful: 37

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Registered: 2021-02-18

Re:L2TP VPN Connection issue-Solution

2024-05-29 17:39:35 - last edited 2024-06-05 18:14:07

This problem could be related to NAT-T in Windows. Check Google: NAT-T Windows 10/11

1) Open the registry editor in Windows. Select Start -> All Programs -> Accessories -> Run, then type 'regedit'.

2) Browser to registry subkey below. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent

3) Create a new DWORD (32-bit) registry value with the string below. AssumeUDPEncapsulationContextOnSendRule

4) Enable NAT-T for both devices located behind NAT. In the Value Data field, type '2'.

5) Restart Windows

Note. Meaning of value for the Value Data field.

0 - When both Omad and Client are not behind a NAT device.

1 - When Omada is behind a NAT device, but Client is not.

2 - When both Omada and Client are behind a NAT device.

Recommended Solution

2 Reply

Clive_A

2024-05-17 01:52:18

Posts: 5981

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Registered: 2023-06-09

Re:L2TP VPN Connection issue

2024-05-17 01:52:18

Hi @User52671

Thanks for posting in our business forum.

You can check this guide out.

Virtual Services(Port Forwarding) on the Router Doesn't Take Effect

It is not targeting your model but can give you some ideas in troubleshooting your modem router.

The ports are forwarded correctly. Nothing wrong with them.

However, you should check if your WAN is actually a public IP address.

Best Regards! If you are new to the forum, please read: Howto - A Guide to Use Forum Effectively. Read Before You Post. Look for a model? Search your model NOW Official and Beta firmware. NEW features! Subscribe for the latest update! ☛Download Beta Here☚ ☛ ★ Configuration Guide ★ ☚ ☛ ★ Knowledge Base ★ ☚ ☛ ★ Troubleshooting ★ ☚ ● Be kind and nice. ● Stay on the topic. ● Post details. ● Search first. ● Please don't take it for granted. ● No email confidentiality should be violated. ● S/N, MAC, and your true public IP should be mosaiced.

Libik

LV3

2024-05-29 17:39:35 - last edited 2024-06-05 18:14:07

Posts: 138

Helpful: 37

Solutions: 8

Stories: 0

Registered: 2021-02-18

Re:L2TP VPN Connection issue-Solution

2024-05-29 17:39:35 - last edited 2024-06-05 18:14:07

This problem could be related to NAT-T in Windows. Check Google: NAT-T Windows 10/11

1) Open the registry editor in Windows. Select Start -> All Programs -> Accessories -> Run, then type 'regedit'.

2) Browser to registry subkey below. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent

3) Create a new DWORD (32-bit) registry value with the string below. AssumeUDPEncapsulationContextOnSendRule

4) Enable NAT-T for both devices located behind NAT. In the Value Data field, type '2'.

5) Restart Windows

Note. Meaning of value for the Value Data field.

0 - When both Omad and Client are not behind a NAT device.

1 - When Omada is behind a NAT device, but Client is not.

2 - When both Omada and Client are behind a NAT device.

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