Way to avoid Windows Firewall prompt?

[dmcgloin]

When I use the cefclient.exe v85, a Windows Firewall prompt appears when I load a page that uses WebRTC.

FirewallScreenshot.PNG (30.78 KiB) Viewed 4189 times

It appears that the firewall prompt is likely caused by CEF trying to listen on local port 5353 mDNS. This prompt only happens on first run whether you allow or cancel.

In my scenario, I cannot disable the use of WebRTC in the web page, so I'm looking for some CEF switch to disable WebRTC so the prompt won't occur. I expect that this would cause WebRTC to fail in the page; but this is not an actual problem.

I've discovered that explicitly creating a firewall rule at installation can make this problem go away. But this is undesirable.

I've seen a list of switches here: https://peter.sh/experiments/chromium-c ... -switches/ . But none seem to work.

Does anyone know any other way I can avoid this Windows Firewall prompt?

Thanks in advance.

[amaitland]

You could try just disabling mDNS as per https://groups.google.com/g/discuss-web ... VwleLiBwAJ

[dmcgloin]

Thanks again, @amaitland.

Good news. It looks like this works:

Code: Select all

settings.CefCommandLineArgs.Add("disable-features", "WebRtcHideLocalIpsWithMdns");

Going to test more to ensure this works consistently.

[amaitland]

As per https://bugs.chromium.org/p/chromium/issues/detail?id=859359#c29 the suggestion is that other features in Chromium use mDNS. So just disabling the WebRTC specific use of mDNS may not be sufficient.

In issue is tagged as being OS Linux, likely other features on Windows would use mDNS as well.