MS Update and SSL Decryption

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MS Update and SSL Decryption

L2 Linker

We are having a problem with MS update and SSL decryption. Currently when a windows machine goes out to get its updates it fails. This appears to be because of the SSL decryption. I tested this by excluding one PC from encryption and it worked just fine. So my question is what are other Administrators doing to allow MS Updates to by-pass encryption?


Accepted Solutions

Hi alexander.graser

Yes the application is excluded from SSL decryption but if the SSL connection is rejected right away by server i.e. server does not send a HELLO in response to HELLO from client SSL decryption exclude list will not be checked.

To have the application excluded you will have to create a no-decrypt policy for URL, *

Hope it helps!

View solution in original post


L6 Presenter

Hi Mattk,

Please refer following document, ms-update is not supported for "SSL decryption". Please exclude it.

List of Applications Excluded from SSL Decryption


Hardik Shah

I saw that, but I see no where in the decryption rules where I can exclude based on Application ID. Where would I locate that?

Hi Matlk,

It can not be done throgh application ID. You can do it with most probable destination IPs of ms-update servers. You can find it from traffic logs. Let me know if that helps.


Hardik Shah

So if I understand what you are saying. Use the traffic logs to identify the MS Update server IP Addresses and then have the system not decrypt traffic to those IP's. Is that correct?

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