How does this behave? All traffic stops passing through that VPN? Does it recover eventually? Does it happen periodically?
Check time on both devices. And check SPIs for this tunnel on both sides when this error starts happening. Compare them if they match.
I've had this issue since December and have multiple tickets open with Palo and Rackspace where our ASA is terminated on the other end. Both parties have had multiple engineers looking into this and I still can't get it resolved. Really hoping to find a fix ASAP as it cuts off the tunnel and causes outages.
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