What if you apply commands below at ASA side to clear and resync SAs.
clear crypto isakmp
clear crypto sa
i have tried many times to clear SA's (Phase1/2) and re-initae the VPN's but the same error appreares again and again.
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.
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