No internet when connected to Azure VPN point to site

Andy Bolk 5

We use Azure VPN to connect our local laptops to our Azure VNet to then connect to Azure file shares. Within the last day our VPN connection still works, but then we lose all internet connections once connected to VPN. We have rest the VPN Gateway and that has not resolved the issue. Any help is appreciated.

Andy Bolk 5 Reputation points

2023-05-03T17:46:08.6+00:00

I was doing some testing with Azure AD DS and had that implemented (and everything worked just fine) and then deleted that. Would that have changed anything that could cause this issue? Or is that a coincidence?
KapilAnanth-MSFT 35,501 Reputation points Microsoft Employee

2023-05-04T05:31:52.56+00:00
@Andy Bolk

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Currently, what authentication method are you using?

And what protocol does the P2S use?

After connecting to the P2S VPN

Open Powershell as admin and Run tnc 8.8.8.8 -p 443

If the above worked, Run tnc www.google.com -p 443

The above is to isolate if this is connectivity issue or DNS issue.

Is this happening with multiple devices or with only a specific machine?

Are you using Azure VPN Client?

If so, after you connect, this will list the routes learned.

Can you please check if you are learning the default route 0.0.0.0/0 from the VPN gateway

Lastly, please redownload the configuration file and re-import it to the VPN Client.

Cheers, Kapil
Andy Bolk 5 Reputation points

2023-05-04T19:45:45.1+00:00

@KapilAnanth-MSFT I'm using AD auth and OpenVPN.

The issue was with internet browsing, Teams also did not work. It was happening for every user and we were all using Azure VPN Client. We tried resetting the gateway as well as downloading and re-importing the VPN client file. I did not get a chance to run the steps above in PowerShell before redeploying AD DS.

I was able to solve this be deploying Azure AD DS again. Is there some setting that was modified when it was originally deployed and then didn't go back to its original status when AD DS was deleted?
KapilAnanth-MSFT 35,501 Reputation points Microsoft Employee

2023-05-05T05:09:58.4333333+00:00

@Andy Bolk

I am glad the issue is resolved now.

However, I am afraid I cannot comment on the root cause without looking at the logs.

Should this issue be reproducible (provided you have a testLab), we can try and isolate the cause of the issue.

While we can make an educated guess that some setting that was modified when it was originally deployed and then didn't go back to its original status when AD DS was deleted, we cannot confirm it.

I shall summarize our discussion and post it as an answer for the wider community and see if other users are reporting this.

I would request you to Accept this answer and close this thread.

Cheers,

Kapil
KapilAnanth-MSFT 35,501 Reputation points Microsoft Employee

2023-06-01T05:15:01.5333333+00:00

@Andy Bolk

Reaching out to check if there are any questions on this.

Please let us know if we can be of any further assistance here.

Thanks,

Kapil

Please Accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer.

1 answer

KapilAnanth-MSFT 35,501 Reputation points Microsoft Employee

2023-05-05T05:20:01.1133333+00:00
@Andy Bolk

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

You informed you were doing a lab with Azure AD DS (and everything worked just fine) and then deleted that, however, post this you lost internet connectivity when connected to Azure VPN Client.

I suggested to,

Check if you are learning the default route 0.0.0.0/0 from the VPN gateway

Redownload the configuration file and re-import it to the VPN Client.

Check if this is happening with multiple devices or with only a specific machine?

And to isolate if this is connectivity issue or DNS issue.

After connecting to the P2S VPN

Open Powershell as admin and Run tnc 8.8.8.8 -p 443

If the above worked, Run tnc www.google.com -p 443

But you informed that you reconfigured the Azure AD DS and removed it once more, which resolved the issue.

If you could reproduce this behavior at will (in a Test environment), we could look deeper into this and isolate and mitigate the issue.

I am afraid the details we have currently cannot help us arrive at a definitive conclusion on the root cause.

Kindly let us know if this helps or you need further assistance on this issue.

Thanks,

Kapil

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
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