Is Synology LogServer Secure

In setting up an a second Synology Nas as an offsite backup I stumbles across synologies logserver capabilities. Which seemed like a great idea to send the secondary NAS’s log to the primary NAS.

I set it up using TCP and shared the cert, forwarded the port etc. But my question is it secure? from what I can see no login required to send the logs and after setting it I noticed external log entries which didn’t belong to me. Looked like one of the internet serve bot scanning ports. As it captured them as log entries it a bit concerning.

Did I miss something in the set up or is this service mean to be used internally or inside of a VPN.

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