Some old, old games, require that the external IP is pingable…
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 …on my old linksys, I just set "respond to ping requests" and all was well, where is there something like that in pfSense? Or do I just make a firewall rule? 
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 yes. 
 just create an allow ICMP rule
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 The firewall rule should be set as follows. Action: Pass 
 Interface: WAN
 Protocol: ICMP
 ICMP type: Echo
 Source: any
 Destination: WAN address
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 Well I made that rule; it doesn't do the trick, changed the rule to any ICMP, still doesn't work… it seems any rules, portforwards I make, just do not want to work... 
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