CEF Forum

How I can catch 2 situations:
1) Rendering process is working, but in the some moment internet connection is lost.
2) Internet connection is absent, when application starting.

I overrided OnRenderProcessTerminated method for RequestHandler but nothing events. Cef.Initialize returned true, Browser Instance successfully initialized

Renderer does not crash on network lost.
You can use OnLoadError for requests in progress and look for errors such as ERR_CONNECTION_RESET.
But I think what you want is - with or without a pending request - is to have a callback for network state itself, and this is related to an adapter state, not request.
There is no CefNetworkManager|State|Whatever class exposed by CEF that I am aware of. That would be a good improvement, I suppose.
(Unless there is a way and I don't know about it).

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You can also use JavaScript online/offline events https://developer.mozilla.org/en-US/doc ... ine_events