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I had the very same issue after updating from 19.7.6 to 19.7.7. Befor it worked pretty well without keepalive set. After it did'nt work at all. Looking for a solution brought me to this thread. Enabling keepalive with 25 as show above does the job. This is maybe the reason why it's not documented, because it was not needed until now. So for existing installations this works for me. But I have another issue that on a newly installed 19.7.7 enabling the VPN is no longer leading to a section firewall:rules:wireguard wher the rules within the tunnel can be defined.
