topic Re: MS Updates blocked in General Topics

MS Updates blocked

seanmccoy — Thu, 25 Jul 2019 16:39:19 GMT

It appears as though all of the sudden ms-upate traffic is being picked up as either session-end reason threat or n/a and updates are failing on my MS servers. Regardless of the server they all seem to be hitting the unidentified default rule at the bottom.

Re: MS Updates blocked

Sec101 — Thu, 25 Jul 2019 18:50:12 GMT

your not getting a decrypt-cert-validation end reason are you?

Re: MS Updates blocked

seanmccoy — Thu, 25 Jul 2019 19:00:50 GMT

No I'm not. If I move to another security policy higher up it works (obviously) but I wan't to find out why this is occuring all of a sudden.

Re: MS Updates blocked

Sec101 — Thu, 25 Jul 2019 19:03:49 GMT

do you have a decryption profile that would identify that traffic and if so, do you have the "block untrusted issuers" check mark box populated - even if no decrypt?

Just curious, as it looks like MS may have a cert or destination that is not on the PA's, but I have yet to deterimine exactly the issue

Re: MS Updates blocked

seanmccoy — Thu, 25 Jul 2019 19:08:29 GMT

I do have a decryption profile but not applied to all. I can insert on the server IPs and see what is going on. Where would I locate the "block untrusted issuers" check box

Re: MS Updates blocked

Sec101 — Thu, 25 Jul 2019 19:39:31 GMT

under objects/decryption/decryption profile/ then in that decryption profile - for the profile itself,

Under SSL Decryption/SSL Forward proxy:

under server certificate verification -check the box that says block sessions with untrusted issuers

Under the No Decryption tab:

check the box for block sessions with untrusted issuers.

Note that this will break traffic if issuers are untrusted or expired, so be careful on what you apply this Decryption policy to if you have never had this applied and are running production traffic through this.

Re: MS Updates blocked

seanmccoy — Fri, 02 Aug 2019 11:47:19 GMT

Thanks all for your help and suggestions.I ended up creating a custom app and subsequent security policy to allow MS updates to run. I did open a case with TAC.

Re: MS Updates blocked

Sec101 — Fri, 02 Aug 2019 18:00:02 GMT

I'd be curious to hear what they recommend.