The solution for us was disabling Layer 7 inspection--specifically we were blocking Peer-To-Peer traffic.  For whatever reason, Meraki changed it so that Layer 7 inspection is now occurring on VPN traffic where it wasn't before. ... View more

We are seeing the same thing - Layer 7 firewall rules are denying internal traffic on the site-to-site VPN.  It broke connectivity between our Mitel / ShoreTel switches and a LOB application that uses .net TCP services.  Appears to be NBAR ID 1889 with a Classification of Statistical Peer-To-Peer. ... View more