We have upgraded from a MX64 to MX75 and the configuration was copied from the old Meraki to the new one and the when we tested the client VPN after the upgrade it appeared to be working with no problems. However it seems to be intermittent and fails often. With the error "The L2TP connection attempt failed because the security layer encountered a processing error during inital negotiations with the remote computer" however might work possibly half an hour layer. We use a RADIUS authentication method using duo however we tried swapping back to active directory and this also is having the same issue.   We are unsure of what is causing this and would love some feedback help.   Just strange that it works for a while and then fails again.  ... View more