DNS Issue with windows 10 when Azure VPN is installed and network card reinstalled

Question

DNS Issue with windows 10 when Azure VPN is installed and network card reinstalled

MrFlinstone 411

I have got a point to site azure VPN configured on my windows 10 device, and all along I have got custom DNS setup such that when the P2S VN is connected, dNS name resolution can work onto azure resources, and of course connection to the wider internet also works. Last week I was consistently experiencing slow internet connection speeds, tried several things to no avail and last option I had which was to uninstall the network cards (ethernet + wifi) and then reinstall then appears to have fixed my slow internet speeds, now getting circa 600mb, before it could barely fo pass 50mb.

In the process of uninstalling the network interfaces, I removed all the interfaces on the device, VPN, ethernet, wifi anything I could find under network adapters until there was nothing else. After the reinstallation of the wifi and NIC cards, I went on to install and configure the Azure VPN client that has always worked without issues. Now this is what I get.

Anytime the P2S VPN is loaded.
It comes up with the error, cannot find host or something like that.
I cannot browse the internet as DNS no longer works.

I see the warning message on system logs.

Name resolution for the name wpad timed out after none of the configured DNS servers responded.  
Name resolution for the name tsfe.trafficshaping.dsp.mp.microsoft.com timed out after none of the configured DNS servers responded.

Prior to the DNS warning message, I get the entry below.

The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID   
{8BC3F05E-D86B-11D0-A075-xxxxxxxxxxxxx}  
 and APPID   
{8BC3F05E-D86B-11D0-A075-xxxxxxxxxxxx}  
 to the user LAPTOP\User SID (S-1-5-21-1118145387-608033059-xxxxxxxxxxxxx) from address LocalHost (Using LRPC) running in the application container Microsoft.AzureVpn_2.1986.50.0_x64__8wekyb3d8bbwe SID (S-1-15-2-3059960481-3753488440-2049713862-xxxxxx-3066129221-xxxxxxxxxxxxxx). This security permission can be modified using the Component Services administrative tool.

I am not sure if they are related.

What appears to be happening is that anytime Azure VPN configuration is loaded and the connection attempted, it fails to connect and then kills off DNS.
No amount of network reset fixes the issue.
The only fix is to restart

I am unsure as to what to do as this is making things very difficult for me, having to restart the laptop anytime I try to setup Azure VPN. I have a similar device, Azure VPN configured and it works fine on the second device without any issues.

KapilAnanth-MSFT 10,981 Reputation points Microsoft Employee

2022-08-16T13:08:23.213+00:00
Hi @MrFlinstone ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are facing challenges with DNS once you connect to Azure VPN.

Can you let me know if the VPN gets connected or not?

Are you able to ping 8.8.8.8 after you try connecting to the VPN?

If you are using Azure VPN client, can you share the "Status Logs" from the app?

Thanks,
Kapil.
MrFlinstone 411 Reputation points

2022-08-17T07:55:42.44+00:00

Hi

The VPN doesnt get connected at all, it fails the connection as it complains that it cannot find the host. This is probably because of DNS issues as the VPN gateway is mentioned in the VPN configuration which it cannot resolve. Ironically its Azure VPN that causes the DNs issues, when i open up Azure VPN on a different device, it works perfectly and as mentioned before it was working perfectly on this device prior to the reset of the network devices and the removal of all network devices on the laptop (I removed every device under connections Wan miniport, Wifi, ethernet etc).
KapilAnanth-MSFT 10,981 Reputation points Microsoft Employee

2022-08-17T08:36:27.94+00:00

Hi @MrFlinstone ,

Thanks for the update.

This issue seems would require a deeper investigation.
If you have a support plan, I request you file a support ticket, else please do let us know, we will try and help you get a one-time free technical support.

Thanks,
Kapil

KapilAnanth-MSFT 10,981 Reputation points Microsoft Employee

2022-08-16T13:08:23.213+00:00

Hi @MrFlinstone ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are facing challenges with DNS once you connect to Azure VPN.

Can you let me know if the VPN gets connected or not?

Are you able to ping 8.8.8.8 after you try connecting to the VPN?

If you are using Azure VPN client, can you share the "Status Logs" from the app?

Thanks,
Kapil.
MrFlinstone 411 Reputation points

2022-08-17T07:55:42.44+00:00

Hi

The VPN doesnt get connected at all, it fails the connection as it complains that it cannot find the host. This is probably because of DNS issues as the VPN gateway is mentioned in the VPN configuration which it cannot resolve. Ironically its Azure VPN that causes the DNs issues, when i open up Azure VPN on a different device, it works perfectly and as mentioned before it was working perfectly on this device prior to the reset of the network devices and the removal of all network devices on the laptop (I removed every device under connections Wan miniport, Wifi, ethernet etc).
KapilAnanth-MSFT 10,981 Reputation points Microsoft Employee

2022-08-17T08:36:27.94+00:00

Hi @MrFlinstone ,

Thanks for the update.

This issue seems would require a deeper investigation.
If you have a support plan, I request you file a support ticket, else please do let us know, we will try and help you get a one-time free technical support.

Thanks,
Kapil

Answer 1

Limitless Technology 37,501

Hello there,

Point-to-site VPN client normally uses Azure DNS servers that are configured in the Azure virtual network. The Azure DNS servers take precedence over the local DNS servers that are configured in the client (unless the metric of the Ethernet interface is lower), so all DNS queries are sent to the Azure DNS servers. If the Azure DNS servers do not have the records for the local resources, the query fails.

To resolve the problem, make sure that the Azure DNS servers that used on the Azure virtual network can resolve the DNS records for local resources. To do this, you can use DNS Forwarders or Conditional forwarders.

The below thread discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
https://learn.microsoft.com/en-us/answers/questions/39571/not-resolving-private-dns-zone-over-point-to-site.html
https://learn.microsoft.com/en-us/answers/questions/64223/issue-with-resolving-hostnames-while-connected-to.html

I hope this information helps. If you have any questions please let me know and I will be glad to help you out.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

--If the reply is helpful, please Upvote and Accept it as an answer--

MrFlinstone 411 Reputation points

2022-08-17T08:00:05.44+00:00

Thanks for the proposed answer, just to clarify I am not having DNS issues with the P2S VPN, I am having issues with my computer device and DNS anytime a connection is initiated from the Azure VPN app. I removed the custom DNS forwarder information which could be found within the xml configuration file still doesnt work, it appears that the VPN connection kills my my default DNS configuration and the only way to resolve this is to restart the device. This wasn't the case prior to the changes I made to network adapters by removing them all and restarting the device this then adds them back ever since I did that, my DNS gets corrupted anytime the Azure VPN app tries to initiate a connection even though it fails.
Mr-DJ 6 Reputation points

2022-09-20T22:22:59.157+00:00

Hi @MrFlinstone
Wondering if you were you able to get any resolution on this issue?
I'm trying to help a co-worker troubleshoot the exact same issue you describe.
The Azure VPN client gives an exception "No such host is known" and doesn't connect, then after that they are unable to reach any internet sites,
since the DNS resolution is broken from that point on. A reboot is the only recourse from there.

DJ
Tom Kuhne 1 Reputation point

2022-10-26T15:27:11.803+00:00

We are seeing the exact same thing on one of our machines. Has anyone figured it out?
KapilAnanth-MSFT 10,981 Reputation points Microsoft Employee

2022-10-27T10:30:32.683+00:00

Hi @Tom Kuhne ,

This issue seems it would require a deeper investigation

To troubleshoot the exact issue, I think we will need a specialized 1:1 session, where a support engineer can have a screen share session to pinpoint the issue.
If you have a support plan you may file a support ticket, else please do let us know, we will try and help you get a one-time free technical support.

Cheers,
Kapil
Mr-DJ 6 Reputation points

2022-12-15T00:57:36.493+00:00

Hi @KapilAnanth-MSFT
I also have a user that is running into the same issue.
We've tried all the steps previously mentioned.
Can you assist in this matter?

Best regards,
Daren

Answer 2

Cuddy, Ronald (C) 1

We had to list the IP and FQDN of the Azure VPN gateway in the host file in c:\windows\system32\drivers\etc

DNS Issue with windows 10 when Azure VPN is installed and network card reinstalled

2 answers

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