I could not access my linode in Japan

Sounds like your Linode was blocked by China’s Great Firewall (GFW). If you'd like to confirm this, you can visit this website to ping your Linode from multiple locations around the world.

There's a Community post, linked below, that provides more information on possible steps you can take to mitigate an issue like this:

• My Linode's IP address has been blocked in my country. What can I do?