Firstly, how are your ports configured on your Cisco's? Are they in trunk or access mode? Might be wrong, but I suspect they are in trunk mode which will allow traffic between them but putting something in between with the incorrect configuration will block the traffic. If the Cisco's are set to trunk mode & 802.1q, the UTM needs set accordingly with appropriate vlans. If they are in access mode, then a straight forward ethernet connection will work. In the UTM, are the ports showing as up and is there any traffic flowing (on the dashboard?) They can show as up but the tell tale sign is "0" in the traffic meter on the dashboard In the UTM, under tools, you should be able to ping the Cisco's. If not, you have a config error on the ports. If you can ping etc, you have connectivity and now you're getting down to routing and firewall issues. But first things first, check the ports and config on the Cisco's to see how they are connected. I had this very issue this week but am so use to it with Cisco's, it's second nature to me.
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