Some nodes are not accessible with a self hosted controller

I was trying to get a node without any internet access to join a zerotier network.

I was following the approach provided in the above link. To my surprise, it worked pretty well for most of the nodes. However, some nodes which are listed as online on the controller do not show up on the machine without internet access.

All other nodes can communicate with each other without any problem.
The node without internet access can communicate to some of the rest nodes. It seems a bit random.

Could you give me some suggestions that I can follow to trace down the problems?

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