Are you guys sure you’ve added a rule in the DSM firewall that allows the vpn subnet to get to NAS?
My openvpn clients come in on the 10.x.x.x subnet, and then I added an 'Allow' firewall rule under vpn network connection for all ports/services to the NAS.
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Just made an account to thank you for that! I was searching for god knows how long and the fix for me was as simple as that! Thank you! Problem solved, life goes on, Halleluijah!