What is the network on the failed system ? cellular ?
From what ? the other node ?
I was able to connect to 65930 this morning
553181 did not allow a connect, so the issue seems to be with that node.
Being NNX, you should probably review that part of your setup, especially if that was a recent change to NNX.
reg data = 553181=radio@202.90.241.21:4570/553181,202.90.241.21