SSL VPN not allowing traffic after period of time

[cenders]

This is my scenario:  Establish an SSL VPN connection to my network.  Start using RDP to remotely manage some of my servers.  After a undetermined period of time, I'm no longer able to establish new sessions to other servers, yet my existing sessions are running just fine.  Disconnect the VPN and Reconnect, then everything seems fine for a period of time.  Seems to do the same with my mapped drives... if I've used them I can access them. If not, then new connections are blocked.

Checking the logs on the PAN, I see no blocked traffic.

Any thoughts? Known problem?  I'm running PAN OS 4.0.5 and SSL VPN 1.3.2.

[bpappas]

Is there any chance that your device has already filled the session table? This could lead to the symptoms you describe.

-Benjamin

[cenders]

I didn't look at the session counter each time it happens, but this can happen to me late in the evening when we have next to no users in our environment.  I will check the counters though to know for sure, but I don't think we are anywhere near maxing out the 125,000 session capabilities of the PA-2020. (failed to mention which device we have in my original posting).

[jleung]

Hi,

Suggest you to check if there is any threat log covering the subnet of your SSLVPN clients. Also check if you have enabled any DoS policy.

[cenders]

Session counter shows 302 active sessions, so that isn't the problem.

Threat log also shows nothing related to the VPN subnet.

Any other ideas?