We're having issues being able to connect to our new location's UTM behind our ISP's NAT'd public IP. I was able to get a site-to-site VPN connection working between our New Location and our other location's UTM by setting our other location's UTM to "Respond Only" as it has a static no nat'd public IP. This works great! Also, users are able to use IPsec VPN to connect to our other location without issue.
Here's some details reagarding our new and other location:
New:
static public ip that is nat'd via private ip
Other"
static public IP lives right on the UTM.
Here's the error I'm seeing when a VPN L2TP IPsec user trys to connect the our new location's UTM:
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