Solution for "SSL decryption bypass for Anydesk"

[OZamir]

Hello,

I am being asked a lot about why is Anydesk getting a "decrypt-error" end reason when SSL Decryption is active.

Here is a simple explanation and how to overcome this.

What you usually going to do with this kind of errors is creating a Decryption bypass rule for Anydesk (in this example)

Since is it impossible to bypass based on application, you would probably use a Custom URL category with a wildcard (*.anydesk.com), and apply it in a bypass rule. Unfortunately, this doesn't work (I'm not sure why, I think Anydesk uses IP addresses and not URLs)

The other option I came across is using an FQND (relays.net.anydesk.com) published in one of the related articles, that also didn't work for me. It was not consistent.

Then I found that Anydesk is being bypassed by default in PANOS (Device -->  Certificate management --> SSL Decryption Exclusion).

Then why isn't it being bypassed?!

Well, it is because of the certificate Anydesk uses. It is using a Self-Signed certificate, and your device does not trust it (yet).

This is the reason for the decrypt-error.

Basically, what you would like to do now is:

Start a packet capture and export the CA certificate.

Then, import the certificate to your device, and mark it as a trusted CA.

Commit, and now Anydesk should work.

I am sharing here the CA certificate currently being used by Anydesk.

Copy the text below to a text file and rename it to ".crt"

-----BEGIN CERTIFICATE-----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VGXFQ55QO/qRkw6dOyNKPUPBxiKbaK8v/AGAUhgFIg69auQuydbsxY/zE7MCAwEA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-----END CERTIFICATE-----

Hope this is helpful.

Cheers!

[S-Battermann]

-----BEGIN CERTIFICATE-----
MIIFbDCCA1SgAwIBAgIJAOcOOMSgQkRlMA0GCSqGSIb3DQEBDQUAMEoxGTAXBgNV
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-----END CERTIFICATE-----
AnyNet Root CA 2 Certificate