Hidden ISP firewall/filtering

["Jerrod Fuller" <jfuller () whitesboots net>]

I recently purchased a Watchguard XTM2 to handle our firewall and VPN with
IPSec, but when attempting to connect via VPN with IPSec, it gives a message
of "VPN gateway not responding (waiting for MSG2)"  I have removed our
watchguard from the network and when I do a "shields up" scan it shows all
ports being closed.  Long story short . . . does anyone know if there is a
way to find out if our ISP actually has a firewall/filtering in place, or b)
have any other thoughts.

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