Shortlink to this article: flipnot.es/isphelp
Hello! If you've been linked to this article, then you are most likely a support technician at an Internet Service Provider.
Your subscriber is attempting to use a service called Sudomemo, which is a Web community of artists and animators creating content using Flipnote Studio on the Nintendo DSi System. A previous service existed called Flipnote Hatena, but it was shut down in mid-2013. Sudomemo exists to fill the void that it left behind, and provide an outlet for those artists and the people who enjoy their work.
If your subscriber is experiencing issues, then there may be an issue with how your configuration is affecting their ability to connect. In general, Sudomemo has two key differences in how it operates from what you'll see with normal web traffic:
- DNS Override
- Use of proxy settings to briefly change the destination of traffic
Here is the article that your subscriber followed to get it set up:
For DNS Issues
If your subscriber is having issues with DNS (which can be diagnosed with this tutorial), you may be redirecting DNS queries (UDP traffic to port 53) to your own resolvers.
If this is the case, please either provide your subscriber with instructions on how to disable this behavior, or if you have more fine-grained control at your end, please permit DNS traffic to 220.127.116.11 to pass through uninhibited.
For Proxy Issues
The initial connection process involves the use of proxy settings to change the HTTP Host header momentarily. It is important to note that we do not run a proxy server, and only approved domains are permitted to connect. At any time, the following Host header values might be sent to ds.sudomemo.net using these domains:
ugomemo.hatena.ne.jp (only in Japan)
After your subscriber connects, the domain used changes to an internal one that normally points at the same place anyway, so it should be indistinguishable from regular traffic after that. If you have anything in place that might interfere with this step, you'll want to make a change to permit this to occur.
We ask that you work together with your subscriber to resolve the issue to the best of your ability. Thank you very much!