FortiOS 6.0.3 problem with explicit proxy and web socket connections
we recently upgraded our Fortigate from FortiOS 5.6.7 to 6.0.3 but have now problems with several "chat" applications, such as facebook web messenger, whatsapp web and so on.
What we have in place
- Explicit proxy
- Proxy is authentication enabled
- HTTPS Deep Inspection is enabled
When we analyze the connection in the browsers, we see always that "wss://" connections are broken, such as
Therefor it is not possible to start web socket based applications
It works when we exclude the domain web.whatsapp.com from deep inspection, but we cant do this for all domains world wide and we never had this problem with 5.6.x.
So does anyone know how to resolve this in FortiOS 6.x?
Any help is appreciated