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#1 2021-06-02 10:17:27

Ollester
Member
Registered: 2021-01-11
Posts: 64

is normal for chrome to connect to 1900 port UDP 239.255.255.250

don't have any devices that should connect between themselves and media routers are disabled in about:config, I am confused about this connections, on some devices I don't have such traffic with chrome.exe
if I block this Internet is gone on chrome

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#2 2021-06-02 10:30:26

Drassen
Member
Registered: 2021-01-11
Posts: 71

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

This address is a IP multicast.

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#3 2021-06-02 10:31:33

Ollester
Member
Registered: 2021-01-11
Posts: 64

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

Drassen;546 wrote:

This address is a IP multicast.

I hear this alot, but can it be dangerous, you too get multicast ip on chrome?
As if everyone knows what is multicast but if a non techie tries to find how this can be exploited he finds nothing useful, only that it is a multicast (obviously)
I don't get such on other browsers and not everytime on chrome , just this device
I am thinking it might come from some addon/extension

"224.* is a multicast "domain", wherein various apps will use it to connect to other apps etc." I do have browser addons

so my question in short is, is it typical for chrome.exe? or I should investigate further

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#4 2021-06-02 10:33:27

Ollester
Member
Registered: 2021-01-11
Posts: 64

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

it was indeed grammarly, not that I need it my English is perfect (joking)
another one that seam to do that is ublock origin

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#5 2021-06-02 10:35:34

Ollester
Member
Registered: 2021-01-11
Posts: 64

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

I don't get it, it seams to be jumping around between extensions so removing one helps for a limited period of time only

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#6 2021-06-02 10:37:45

Drassen
Member
Registered: 2021-01-11
Posts: 71

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

After little Google'ing I think it is not extension. There is built-in Chrome feature using multicast for "Google Cast". These link seem to provide information how to disable it. I don't use Chrome, so I didn't try it.

https://www.stigviewer.com/stig/google_ … ng/V-81597
https://cloud.google.com/docs/chrome-en … ediaRouter
https://www.chromium.org/administrators … ediaRouter

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#7 2021-06-02 10:38:42

Ollester
Member
Registered: 2021-01-11
Posts: 64

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

the option for disabling it was the first thing I did, didn';t help though, also its random, on some pcs it doesn't want 255.255 but the normal dns I have set

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#8 2021-06-02 10:40:12

Ollester
Member
Registered: 2021-01-11
Posts: 64

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

according to some forum user there is possibility of Windows using Shell32 DLL and API for Bing functionality in Windows 8 and later versions since that IP seems to point to Bing search server.

On some systems chrome doesn't connect to 255 (...) but normal chrome ip addresses

ok found something here https://www.lifewire.com/how-to-turn-of … the%20list.
but apparently it is not possible to disable chromecast

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#9 2021-06-02 10:41:54

Ollester
Member
Registered: 2021-01-11
Posts: 64

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

OK found something, to stop at least some Chrome UDP connections:

Chrome:
“chrome://flags”
Experimental QUIC protocol | Disabled
it is on (Enabled) by default since 2013

"The issue is not with the protocol or the technology itself. The supposed upside of QUIC is that it makes web communications more efficient and faster. The problem is that it is not supported by security appliances such as firewalls yet, and has therefore inadvertently created a security hole for many organization"

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#10 2021-06-02 12:57:29

HanBaoCinch
Member
Registered: 2021-01-11
Posts: 93

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

thanks for your follow-up, luc. good info.

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#11 2021-06-02 13:01:08

lolapolooza
Member
Registered: 2021-01-11
Posts: 66

Re: is normal for chrome to connect to 1900 port UDP 239.255.255.250

Just block the address in your firewall. For me, chromium is only allowed to connect through ports 80 and 443 and whatever localhost stuff I use, and only TCP

https://i.imgur.com/VdE3HNJ.png

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