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ESET blocks l2tp connections


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Good day, everyone.

Could you be so kind and give me some advice, please? I'm using PPTP VPN connection (standard Windows 7 client) and it works perfectly fine. However, when I change settings to L2TP VPN - its connection and authorisation process goes fine till the moment of "registering computer on the network". Then Windows error 720 appears. I've also tried to use OpenVPN client. Anyway, it makes no difference.

My VPN provider insists, that ESET Firewall may block L2TP connection because of this (quote from OpenVPN log file):

Quote

Sun Mar 18 00:39:00 2018 Warning: route gateway is not reachable on any active network adapters: 10.8.12.5
Sun Mar 18 00:39:00 2018 Route addition via service failed

Is it possible, that ESET IE allows PPTP, but blocks L2TP? Do you have any solution to solve the issue? Let me know, please.

Thank you in advance.

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Your VPN provider is not doing his job properly. He should have immediately recognized what the problem is.

To use L2TP VPN, special firewall rules are required. If you have the Eset firewall set to default configuration, then it is also using the Win firewall inbound rules. Those rules need to be modified as noted in this article: https://www.magnumvpn.com/setup-windows-10-firewall-l2tp.html . Although the article is for Win 10, the firewall rules are applicable to Win 7.

Also possibly, Eset's firewall rules will also have to be modified in regards to UDP ports 50, 500, 4500 to allow unrestricted inbound access. Also I don't know if Eset's firewall has the equivalent to the Win firewall IPsec authentication; I don't believe so.

Edited by itman
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21 hours ago, Marcos said:

Does actually pausing the firewall or disabling it completely in the advanced setup make a difference?

Dear Marcos,

Unfortunately, pausing or disabling the firewall does not solve the issue. The same error still appears.

I'm using Interactive mode and ESET always asks to allow VPN connection. So could ESET actually block L2TP? I mean ESET firewall is very smart. Why should it allow PPTP but block L2TP? 

 

19 hours ago, itman said:

Your VPN provider is not doing his job properly. He should have immediately recognized what the problem is.

To use L2TP VPN, special firewall rules are required. If you have the Eset firewall set to default configuration, then it is also using the Win firewall inbound rules. Those rules need to be modified as noted in this article: https://www.magnumvpn.com/setup-windows-10-firewall-l2tp.html . Although the article is for Win 10, the firewall rules are applicable to Win 7.

Also possibly, Eset's firewall rules will also have to be modified in regards to UDP ports 50, 500, 4500 to allow unrestricted inbound access. Also I don't know if Eset's firewall has the equivalent to the Win firewall IPsec authentication; I don't believe so.

Dear itman,

Thank you for the article. I've added the Windows firewall rule and ESET too. However, it did not solve the issue. The same 720 error appears.

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Quote

The corrupted Wan Miniports are causing Error 720 for some Windows users. If you are getting this error, follow the below mentioned steps to solve this issue.

https://support.ivacy.com/kb/how-to-solve-error-720-remote-computer-could-not-be-established/

Doubt the above is the issue since PPTP VPN connection works fine.

Based on this article: https://www.wiknix.com/vpn-error-720/ , you might have to add the router's IP address either to your network adapter IPv4 parameters -or- add the router's IP address to Eset's Trusted Zone as shown below:

Eset_Firewall.thumb.png.dc7153df10665fec804fa023d825dbf3.png

Also, here's an article on how to troubleshoot Eset firewall issues: https://support.eset.com/kb6530/

 

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itman, thank you for your reply. However, now it's obvious, that ESET doesn't block L2TP. I've formatted my HDD and reinstalled Windows. Even now L2TP doesn't work and error 720 still appears. So I think, the problem is not in my PC at all.

I do hope to solve the issue with VPN provider. Otherwise, I will use PPTP.

Anyway, thank itman and Marcos for your help. If one day I will find any solution, then I will update this topic.

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  • 1 month later...

Hello, everyone!

Finally, I've found the solution. So ESET does not block L2TP connections. Moreover, ESET should not block any connection if you configured one correctly.

@itman, you were absolutely right: 

On 3/21/2018 at 4:20 PM, itman said:

Your VPN provider is not doing his job properly.

I've changed VPN provider and L2TP works perfectly nowadays. Thank you!

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