Please be advised, there is a current issue with PAN-OS 8.1 which seems to break anything SMB related, e.g. mapped network drives. Sessions have an end reason of "resources-unavailable" and go into state "Discard" in the session table.
Upon speaking with a TAC engineer, this is a known issue and they are working towards a fix.
Edit: This is now resolved in PAN-OS 8.1.1 under BugID:
Fixed an issue where Server Message Block (SMB) sessions were in a discard state with the session end reason resources-unavailable
So far I've had no issues with 8.1 och PA-220, not that much traffic passing through it though...
On a couple of PA-850 the only option was to do a downgrade, no SMB traffic worked as intended.
Could it be related to certian hardware platforms? What platforms have you experienced problems on?
Click Accept as Solution to acknowledge that the answer to your question has been provided.
The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!
These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!