Yahoo related subdomain breakage (guce subdomain)

[radupotop]

Some websites wouldn't load if the guce.* subdomain is blocked. This has something to do with how Yahoo handles cookies. All these websites seem to use Yahoo in some way.

I can confirm that:

• login.yahoo.com won't work if guce.yahoo.com is blocked -- after login it tries to reach that subdomain and stops
• techcrunch.com won't load if guce.techcrunch.com and consent.yahoo.com is blocked -- it won't load at all

Someone else confirmed this issue for other domains: lightswitch05/hosts#188 and migueldemoura/ublock-umatrix-rulesets#10

[radupotop]

The only blocklists I'm using are: "NextDNS Ads & Trackers Blocklist" and "AdGuard DNS filter"; with "Block Disguised Third-Party Trackers" set to ON, "Allow Affiliate & Tracking Links" set to ON.

[radupotop]

I can also confirm this for the following Engadget link. It tries to resolve guce.engadget.com which is blocked by the NextDNS Ads & Trackers Blocklist.

[quantumpacket]

Related thread: https://bleepcoder.com/hosts/631089422/guce-domain-breakage

[upcboy]

I am seeing the same thing