A certificate could not be found that can be used with this Extensible Authentication Protocol. (Error 798)

Kang Le 20

Previously my certificate expired, I deleted the certificate and re-downloaded it and installed it, after reproducing the installation the certificate and the client had this problem

User's image

I'm having this problem, I've troubleshot it according to the docs and it's still not resolved.

Kang Le 20 Reputation points

2023-07-11T07:35:04.13+00:00

I looked in the certificate manager and saw that both certificates were successfully installed.
KapilAnanth-MSFT 41,491 Reputation points Microsoft Employee

2023-07-11T08:17:51.2266667+00:00
@Kang Le

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

I am afraid I did not understand the part, "re-downloaded it and installed it".

Should a certificate expire, shouldn't you be recreating the Root and Client certificates?

Refer : Generate and export certificates for point-to-site using PowerShell

After recreating the certificates,

Please update the Root Certificate in the P2S VPN Gateway

Make sure the newly created certificates are properly installed in the OS

After this, download the VPN Configuration from the gateway and give it a try again.

Cheers,

Kapil
Kang Le 20 Reputation points

2023-07-11T08:51:53.83+00:00

@KapilAnanth-MSFT

Sorry, there may be a problem with my description, my credentials have been updated
KapilAnanth-MSFT 41,491 Reputation points Microsoft Employee

2023-07-12T05:44:59.1266667+00:00
@Kang Le

From the Azure VPN Client, click on "Diagnose" from the ellipsis next to the VPN name.

Then click "Run Diagnostic" and share the results.

Also, you have redownloaded the VPN Client configuration right?

And make sure you have updated the Root Certificate in the P2S VPN Gateway
Kang Le 20 Reputation points

2023-07-12T07:18:35.9733333+00:00

Problem solved, thanks. @KapilAnanth-MSFT
KapilAnanth-MSFT 41,491 Reputation points Microsoft Employee

2023-07-13T03:02:53.16+00:00

@Kang Le

That's great! Glad the issue is now resolved.

I have summarized my comments and posted them as a new answer.

I would highly appreciate it if you could accept the answer and close this thread

Original posters help the community find answers faster by identifying the correct answer.

Thanks,

Kapil

Accepted answer

KapilAnanth-MSFT 41,491 Reputation points Microsoft Employee

2023-07-13T03:01:39.6233333+00:00
@Kang Le,

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

Should a certificate expire, shouldn't you be recreating the Root and Client certificates?

Refer : Generate and export certificates for point-to-site using PowerShell

After recreating the certificates,

Please update the Root Certificate in the P2S VPN Gateway

Make sure the newly created certificates are properly installed in the OS

After this, download the VPN Configuration from the gateway and give it a try again.

You informed this resolved the issue :)

Cheers,

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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A certificate could not be found that can be used with this Extensible Authentication Protocol. (Error 798)

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