Using localhost proxy results in ERR_CONNECTION_RESET

[JMilly]

Platform : Windows x86
CEF Version: 78.3.9+gc7345f2+chromium-78.0.3904.108


When I try to set cef to use a proxy either via

Code: Select all

command_line->AppendSwitchWithValue("proxy-server", "http://localhost:64765");

or the SetPreferences function.

Any attempt to load a page fails with ERR_CONNECTION_RESET , passed down from the OnCefLoadError callbacks.

The localhost proxy works with version 72 of cef but not the version (78.03904.108) that i'm using.
Neither localhost or 127.0.0.1 work.

Also non localhost proxies work without issue using both the command line and SetPreference method.

Is there some setting i need to disable/enable to allow localhost proxy connections? (No authentication is being used).

[Czarek]

Does the proxy work in Google Chrome? Have you tested with cefclient?

[JMilly]

It is not working with Google Chrome or cefclient. Interestingly it's also not working with the 3626 cefclient. But our application using the cef 3626 build does work. I'm investigating this further.

[JMilly]

I have solved the issue. Our localhost proxy only accepted connections from processes that it launched itself. However, it appears that in the newer versions of Cef, the proxy connection is made in one of the sub-processes and not the main process. This caused our proxy to reject the connections resulting in the ERR_CONNECTION_RESET return code.

[amaitland]

Chrome switched to using a dedicated subprocess for network access (NetworkService). CEF implemented support for NetworkService in branch 3770

See https://bitbucket.org/chromiumembedded/ ... orkservice