It was used for setting up a private cloud at home. After two months of work, I finally got to start my journey. Apparently, I was given one flawed item. The cloud was unstable, but after a full round of fixes from technical support and a replacement hardware upgrade, everything is running like clockwork. In my setup, the border router is also a Zyxel, so everything is in sync and I have no idea why others are having trouble getting UPNP to work.
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