Remote Monitoring through Site to Site VPN

[spatchE]

I have a Nagios appliance at location "A", I have no issue communicating to my devices through WMI, SNMP, or ICMP, at location "A". However, if I am trying to even just simply ping a device in location "B" or location "C" in which are connected through site to site VPN, I simply cannot do it. It will not communicate from either direction. My firewall has access rules implemented to allow the traffic, I can see the packet reaching location "A" firewall but never reaching location "B" firewall. Other devices in location "A" are able to communicate with location "B" and "C" except for the nagios appliance. Is there something I am missing?

[npolovenko]

@spatchE, I see you have opened a ticket for the same issue in our ticketing system, so I will be closing this thread. In the future please only open one or the other so we can focus our efforts. Thank you!