Monitoring a Generic Host from GTM, monitor is flapping

Little more info, when the monitor goes read, and I mouse over it, it tells me that the gateway_icmp has failed, but the address that issued the ping that failed is a self-ip on one of my ltms, that are also defined as servers, with several virtual servers on them. Is there some default prober config ( I can't find any probers defined for my datacenters, I haven't created any) that says a LTM automatically becomes a prober? Right now, the LTMs are on the dmz interface of my firewall, whereas the GTM is outside the firewall (mgmt int in a protected network) on the same vlan as the outside interface of my vpn server. The GTM can ping the vpn server no problem, but the firewall doesn't currently allow the LTM to ping the outside of the VPN server, as there is no need to, unless I can't figure out how to fix this....