Openvpn with tap cannot ping anything, Securefishnet or openvpn from the terminal works

[nephros]

No it isn’t, usually:

Enable ping to SFOS/firewall settings

Ping is a ICMP Echo Request (i.e. ICMP Type 8, Code 0). Incomimg packets are blocked in /etc/connman/firewall.d/10-block-icmp-firewall.conf or more precisely, all other ICMP packets are allowed over there, the chain’s policy is DROP: IPv4.INPUT.RULES = -p icmp -m icmp ! --icmp-type 8/0 -j ACCEPT