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When VPN enabled, lost DNS and DCO / Event ID 8015, 334 ...

El Tistou 101 Reputation points
2021-05-15T10:33:08.837+00:00

Hello all,
On a Windows Server 2019, when I'm connected on the VPN (IKEV), I lost the connection with local DNS (event ID : 8015).
I lost the communication with my DC (event ID : 334, 5719, 1054).
Of course when I try to connect on shared folder : \nameofcomputer it don't work ... (by IP : yes).
When someone connect on this server it's very long and the VPN disconnect.
NSLookup show that it's the DNS remote who is by default.
So I change the metric, I enter "1" on my network adapter.
NSLookup show :
DNS Request timed out
Default server : Unknow
Address : 192.168.0.1

Thanks in advance for your help.

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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  1. El Tistou 101 Reputation points
    2021-05-16T08:34:39.78+00:00

    I don't understand why the firewall would be the source of this problem.
    Because when I'm disconnected from the VPN all work.

    I've deactivated the Firewall and the problem is always present.

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  2. Sunny Qi 10,926 Reputation points Microsoft Vendor
    2021-05-18T10:01:49.807+00:00

    Hi,

    Thanks for posting in Q&A platform.

    My understanding is when IKEv2 VPN is connected, you cannot connect to the DNS server. And as provided screenshots, my understanding is the IP address of VPN connection is 10.59.40.118 and the IP address of DNS server is 192.168.0.1. Please correct me if my understanding is wrong. Please make sure that these 2 subnet can connect with each other via a specific router.

    Best Regards,
    Sunny

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  3. El Tistou 101 Reputation points
    2021-05-21T19:26:37.677+00:00

    Hello,

    When I'm connected on the VPN I can't resolve the address with my local DNS.
    I can contact with a ping or again with the SMB protocol "\192.168.0.1".
    I've two network cards : one for the local area (192.168.0....) and other one for the VPN (10.59.40).

  4. Nick Doud 6 Reputation points
    2023-09-13T17:22:17.15+00:00

    For me it works on initial connect, can ping things, and connect to network shares. Event 8015 triggers at random, then I can't ping or access network drives.

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