We are seeing the same. Last night our two MXs upgraded from 15.43 to 16.15, and all VPN connectivity to non-Meraki peers (both Fortinet and Cisco ASA) refused to come up. We're using IKEv1 and supported algorithms. We attempted rebooting the appliances, as well as manually renegotiating the VPN on the remote end; nothing worked so we ultimately rolled back to 15.43. I called support this morning and the rep was unaware of any widespread issues. ... View more