Can't access outside VPN after migrating Cisco PIX to ASA

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Can't access outside VPN after migrating Cisco PIX to ASA

Situation: After migrating Cisco PIX to ASA, in side users can't establish outside VPN. They get error 721m 800 or 806.

Resolution: Add a access list to allow outside GRE pass through, for example,

access-list outside_access_in extended permit gre any any

Or GUI looks like this.