I want to set up a IPSEC VPN between my site and an external cloud server. However I wasn't able to even ping the external cloud's IP address from behind my firewall at my site. I have determined the problem to be my Watchguard X550e firewall because I was able to do that if I remove the appliance. The strange thing is this is a problem for this particular address only because I have no problem at all with other external addresses. I have checked to make sure that I allow ping in and out without any restriction. Any suggestion?