Monster Hunter 4U, NAT type D, Error Code: 006-0612

I have followed this guide to find out my NAT type and try to fix it. It still stays at NAT type D and get the same error code in MH4U. It works fine on other networks. Is there anything I can do or is my network just bad.
Thank you for the help. And thank you for helping the community!

It’s your network.

I recommend calling your Internet Service Provider (ISP) to discuss it with them to allow more P2P (peer-to-peer) connections.

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