We have the same problem here, in a HA with 200D.We found an important
information on 5.2.4 Release Notes(pages 5 and 32):287871 -
Administrative access to the FortiGate using HTTPs and SSLVPN access
with the second WAN interface may fail upon upgrad...
You are leaving our website
You are leaving our site and we cannot be held responsible for the content of external websites