It's older than a lot of new developers at this point.

For a little historical context:

IPv6 became a draft standard in 1998, and did not officially lose the "draft" status until 2017.
Hurricane Electric launched their well-known IPv6 tunnel service in 2001.
Google has published IPv6 adoption stats since 2008. These stats consistently show a greater fraction of users are on IPv6 on the weekend, because it's more common on mobile and home networks than office networks.

The solution to fix my development environment at my old job was disabling IPv6. Gives a good insight into the quality of the software...

Ah yes, the print server the whole company relies on.

For whatever reason, to this day I get a 403 error on http://google.com/ from IPv6. https://www.google.com/ works through.

Sometimes it's not your side that is broken.

http://google.com/ works fine for me, tested in Firefox and with curl -6. So it could actually be your side that is broken, although it is probably your ISP's.
- My side works fine, Google just doesn't like the address. It's a tunnelbroker address, maybe they consider that bots... but only for some of their servers? It's weird
http://ipv6.google.com is a thing! If it works for you, you have working ipv6, if it doesn’t, you don’t!
- I have IPv6, Google just doesn't like my address.

I have all sorts of weird troubles with IPv6 at home. Facebook won't load some content, Netflix will frequently buffer and fail to load, Steam will almost never download things quickly.

Turn off IPv6 on my router, all my troubles go away.

sounds like it may be a wonky dns server. if youre interested, try re-enabling ipv6 but use something like cloudflare's dns in lieu of your ISP's
- Either that or the ISP's IPV6 routing is broken

Love the label 😂

But ugh, ipv6 is haaarrrrd
- How hard would it have been to just add another octet or two? I like using my 10key and if I have to type letters for an IP address it's a bad system.
- Unless I'm mistaken, it's also impossible for many - myself included. My ISP doesn't provide me with a public facing IPv6 address.
- It really isn't, but vendors often make the IPv6 config optional and often don't have an auto-config wizard for IPv6 like they often do for IPv4.
  Take Ubiquiti EdgeOS, setting up a PPPoE with IPv4 has a dedicated GUI wizard that shows up when you first log on, but IPv6 config is all confusing CLI commands.
  IPv6 is haaarrrrrd because vendors are lazy.

Accurate label

I'm in Canada and none of the 3 ISPs I have available support ipv6 even on business connections.

You can probably guess the three and be wrong but also right, this is the case lots of places in Canada only less options.

S920? I'd buy one to replace my rpi...

I have one, they're awesome.
I MacGyvered a 2.5" HDD into it and idling it draws 5W, while my pi 3 draws 4-5W, so definitely worth a try, if you can get a cheap one.

Weird to see this, I had to do it this morning!

I have a fix to enable IPv6 but I'll do it after hours :)

Used to have an MSI wind back in the day, this looks exactly like it!