Firewall prompt on start due to media router extension
Reported by
rchlodni...@opera.com,
Oct 28 2016
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Issue description
Version: 56.0.2903.0 canary (64-bit)
OS: Windows 7
What steps will reproduce the problem?
(1) Reset firewall rules ("netsh firewall reset") or manually remove all firewall inbound rules for Chrome in Windows Firewall Manager
(2) Start Chrome
What is the expected output?
No firewall prompt
What do you see instead?
Firewall prompt shown on Chrome start
There was a fix made for this issues in https://codereview.chromium.org/1821823002 which notifies Media Router extension when if it's OK to trigger cast device discovery. Either that was never handled by the extension or it has regressed because it seems that now extension triggers MDNS on start rather than on showing the cast dialog
Do note that Chrome automatically adds firewall exception for MDNS traffic on install so this bug only triggers if that rule doesn't exist. That's why it's necessary to reset firewall rules to test this.
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Oct 31 2016
I've tried again on both dirty and clean profile. - I get prompt on start in dirty profile. - I don't get the prompt on start in clean profile. Not even after invoking Cast... option and showing the cast dialog. Is there reasonably explanation for that? :)
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Nov 4 2016
I suppose is more aggressive with discovering when it assumes that firewall prompt was already shown at least once? I guess it makes sense.
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Nov 5 2016
Chrome stores the set of events that each extension currently has interest in, so that when Chrome restarts it needn't start up event-pages until a relevant event actually occurs. So once you have run Media Router and it has enabled mDNS, Chrome will always listen on mDNS on startup, even if you've reset Media Router not to, unless Media Router actually runs and tells Chrome it's no longer interested.
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Nov 17 2016
David, can you verify the behavior of the firewall prompt on Windows with a clean profile? To be clear it should not show on Chrome startup but is expected to when you open up the MR dialog.
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Nov 17 2016
I tested on Win 7, Win 8, and Win 10, with Chrome Canary, and the firewall prompt displayed when MR dialog opened on each. Not when Chrome was opened.
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Nov 17 2016
,
Nov 17 2016
Sounds like WAI. |
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Comment 1 by w...@chromium.org
, Oct 28 2016