Changing pfSense IPSec VPN settings

I realized there's not much about our pfSense on this blog and I guess the main reason is because they have been working very well for us.  I have run across one issue twice now so I'd like to document it so I remember it in the future.

When changing the local network and reconfiguring the VPN to start working again, it is not enough to just change the settings under VPN -> IPSec ->Tunnels.  I'm not sure what this is about but you must also go under Status -> IPSec -> SPD and remove the old network < and > otherwise the tunnel will not startup.  You have to do this on both ends (the local and remote pfSense).

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