SMB traffic identified as active-directory

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SMB traffic identified as active-directory

L3 Networker

From one of our management servers  (Windows Server 2016) SMB traffic is identified as active-directory, but from user clients it's correctly identified as ms-ds-smbv2. Anyone come across this? We have several storage solutions (NetApp filer, iSCSI, DFS on Fibre Channel storage), and it seems to happen with all of them.

 

One more thing: this only happens when we look at the properties of a file or a folder, not when opening it or performing other operations.

 

We have two PA-5050 in HA (active-passive) running PAN-OS 7.1.15.

6 REPLIES 6

L1 Bithead

I am having the same issue.  

I have opened a TAC case for this and have sent some packet captures and logs. Will report back when I hear back from them.

Update: TAC has not been able to replicate this problem, but it looks like it only affects DFS file shares.

Update: according to TAC this is expected behaviour. When you right-click on a file or a folder and select Properties the app-id on Palo Alto will change from ms-ds-smb to active-directory. So they adviced us to open for active-directory + ms-ds-smb in all applicable policies (mostly for our management servers). Of course, if I just add active-directory in the policies I get a bunch of warnings when I commit about active-directory depending on kerberos etc.

 

How does the rest of the community handle this?

 

L1 Bithead

Edit:  I did not see how old this thread was, I will open a TAC case and report.

 

Expected behavior is a BS answer!  This started today at 12:50AM Arizona time.  Was listed as ms-ds-smbv3 prior to that.  How can we use applications in our security policies when they (Palo Alto) modify their decoders without notification.

 

I had to create an emergency change to allow that traffic.

Agreed that this answer is BS. Clearly SMB works without 'active-directory-base,' so why does it kick off (plus 'ms-netlogon') when you look at the properties? It seems obvious that some sort of permissions is being check to view. Does anyone know if Microsoft have any documentation on this?

- J
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