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03-18-2015 09:44 AM
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?
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03-19-2015 04:38 PM
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 update.microsoft.com, *.update.microsoft.com
Hope it helps!
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03-18-2015 10:16 AM
Hi Mattk,
Please refer following document, ms-update is not supported for "SSL decryption". Please exclude it.
List of Applications Excluded from SSL Decryption
Regards,
Hardik Shah
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03-18-2015 12:04 PM
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?
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03-18-2015 12:10 PM
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.
Regards,
Hardik Shah
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03-18-2015 12:26 PM
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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