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

Question

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.

Answer 1

Just checking if there's any progress or updates?

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Answer 2

I have not explained enough.

In fact "use default gateway on remote desktop" don't change the result (check or uncheck).
The ipconfig of VPN is the same :
gateway : 0.0.0.0

And the nslookup give always : "DNS request timed out" (witch change metric).

I said "no option "gateway"" to put a IP address.

Answer 3

DNS request timed out

I'd check the correct DNS server are being used. Generally a vpn client connection inherits the DNS servers used on the RRAS server.

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Answer 4

Answer 5

Looks like a firewall is blocking. I'd check the required ports are flowing between networks.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/config-firewall-for-ad-domains-and-trusts
https://www.microsoft.com/en-us/download/details.aspx?id=24009

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