Why is-36 of Firefox on Windows receiving connections from DNS servers? Option network.dns.get - ttl

Following update Firefox 36, my firewall was flooding asking me to allow external connections from the Internet to my browser. Looking at it more closely, Comodo Firewall indicates that external websites are trying to connect to Firefox, port 53 to an arbitrary port on my machine.

If I disable the option FF36 new network.dns.get - ttl, it stops. I can't find any documentation or help on this option.

Why Firefox do this? Is Comodo incorrect when he labels it as an external connection attempt? (It has normally been extremely good to differentiate the incoming and outgoing traffic). I guess that Firefox is trying to determine the TTL for DNS caching, but it is not make sense why DNS servers then try to connect to me.

I am reluctant to create a firewall rule to that arbitrary Internet connections on my machine are OK as long as their origin on port 53, tips on how to manage all that this new feature is firmly States would be appreciated.

Thanks in advance for any help.

Hi grammarye,

Yes, you're right in thinking that Firefox is trying to find the TTL value. This is new in Firefox 36 behavior and was presented as services frequently changing DNS records (such as Cloudflare) were not working properly for Firefox users.

Firefox makes asynchronous DNS searches - which means it will make a DNS query and then proceed to perform another task instead of waiting for an answer.

Your ISP DNS server puts in cache only TTL an area for a short time, so if it does not the current LIFE expectancy, he will interview with other DNS servers to find.

IANAE, but probably what is happening is:

  1. Firefox tries to find the DNS record for the domain that you want to connect to
  2. Your ISP DNS server does not have the current LIFE expectancy, then connects with other DNS servers to find
  3. During this time, Firefox lingers with something else
  4. DNS server, then reconnects to give you full DNS, including the TTL check
  5. Comodo sees the packets of the DNS server and panic

I completely agree that arbitrary ports of white list is a bad idea, but in this case, the behavior is completely harmless.

You can want to whitelist Firefox in your Comodo Firewall, or continue to let network.dns.get - disabled ttl.

(edited to fix broken links and add a sentence)

Tags: Firefox

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