How to set up a gateway node?

How to set up a gateway node?

I have two nodes running in my local machine. one public facing and another connected ONLY to the public facing node. I ensure they are whitelisted and in different ports. the nodes connect just fine, but for some reason my "hidden" node is not syncing. The data transmitted it and the public fancing one is just a few KBs. If i run it on regtest, generating blocks and sending txs happen basically instantly, so that works fine. Whats going on in mainnet that it doesnt allow it to sync? Is there something i need to configure?

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