Moved from Windows to Synology and ALMOST have it going

Then the port would be closed too. But maybe Synology has some firewall too and you should allow an incoming connections to the node’s port and allow any outgoing connections from the Synology.
The error points to some routing problems or working firewall like here:

The error like

was implemented recently to reduce ddos’ing from incorrectly configured nodes like when the firewall allows outgoing connections to ping the satellite, but unable to receive an incoming ping because incoming traffic is blocked by source for example (you should not specify source port/address in the firewall rule, you should specify only target port and IP (if needed)).
For outgoing connections the source and target should be any (i.e. no blocking of any outgoing traffic).

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