Are we talking site 2 site VPN or remote access VPN? What ASA model are you using? what software version are you running? Please provide a little more info on your issue and how you are testing so that we can help you further.
Would help to see a sanitized full running configuration of your ASA (and in the case of site 2 site VPN, the remote site configuration as well).
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Please remember to select a correct answer and rate helpful posts