Nintendo Switch: "Registration is Required to Use This Network"

[Klaaktu]

Setting the proxy address to HTTP listening address of sslocal(shadowsocks-rust) works fine on my laptop and phone, but on Nintendo Switch an error message is shown when it's checking the connection to Internet

"Registration is Required to Use This Network."

When I click next then it opens the browser to ctest.cdn.nintendo.net which just says "ok" on the page. However when I close the browser Switch just disconnects.
This problem doesn't happen when I use Shadowsocks-Windows as the local proxy. It says "successful" as normal.

[DuckSoft]

Is there a Captive Portal on your WiFi network before actually connecting to the Internet?

If so, you must have your session (or mac address) acknowledged by the portal, then you can (probably) access your own proxy service.

[DuckSoft]

Uh, I should have searched...
It's already put by @zonyitoo: hyperium/hyper#2313

[DuckSoft]

@Klaaktu I've made a workaround in https://github.com/shadowsocks/shadowsocks-rust/actions/runs/736992309.
You may build commit 0151f6a locally to use now, or you can wait for the stable release.

Case closed!

[Klaaktu]

Thanks!
(Oh wow didn't know the issue already exists. Just got a bunch of generic stuff when I tried googling...)

[zonyitoo]

@DuckSoft Where did you send ticket to Nintendo? I found it long time ago and couldn't find a way to tell them about their stupid code.

[DuckSoft]

Nintendo Support (Japanese): https://support.nintendo.co.jp/

---

ps: Some update (2021-04-13 10:49 am) from Nintendo:

このたびはお手数をおかけしまして、誠に申し訳ございません。

お客様より頂戴いたしましたご意見・ご要望は、関連部門に報告させていただきます。

今後とも弊社製品をご愛顧賜りますようお願い申しあげます。

[zonyitoo]

Yes. It is a known issue. It is because hyper, the HTTP library supporting sslocal's HTTP proxy, doesn't preserve header's case. hyper will convert all headers' key to lower case.

HTTP headers are case insensitive, so what hyper does is totally correct based on RFC.

But Nintendo Switch's connection test will try to send a GET request to http://ctest.cdn.nintendo.net/ and expecting a response with header X-Organization: Nintendo, in case sensitive way.

I opened an issue log time ago and they recently found a solution.

[zonyitoo]

Oh, there is a View more button. I saw you guys have found my issue already.

[zonyitoo]

665027a

curl 'http://ctest.cdn.nintendo.net/' --proxy 127.0.0.1:1300 -v -H 'User-Agent: NX NIFM/00'
*   Trying 127.0.0.1:1300...
* Connected to 127.0.0.1 (127.0.0.1) port 1300 (#0)
> GET http://ctest.cdn.nintendo.net/ HTTP/1.1
> Host: ctest.cdn.nintendo.net
> Accept: */*
> Proxy-Connection: Keep-Alive
> User-Agent: NX NIFM/00
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Cache-Control: max-age=0, no-cache, no-store
< Content-Length: 2
< Content-Type: text/plain
< Date: Fri, 23 Apr 2021 02:22:21 GMT
< Expires: Fri, 23 Apr 2021 02:22:21 GMT
< Pragma: no-cache
< X-Cache: MISS from SZ-SQUIDWEB-70
< X-Cache-Lookup: MISS from SZ-SQUIDWEB-70:8080
< X-Organization: Nintendo
<
* Connection #0 to host 127.0.0.1 left intact
ok

[Klaaktu]

Nice!