how do I prevent incoming IP connections from being blocked by VPN

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I run Remote management software for equipment. these devices check in on a database on my PC. I made the exemptions on my firewall and added the port numbers under the .exe files of the software that I use. if the VPN is on, no connections are made, if the VPN is off and firewall is on, the connections occur.

I need to hide the traffic incoming/outgoing to my static IP to prevent hackers from sniffing out the port numbers. this is why I do not want to use Split-tunneling.

any advice would be extremely helpful.

Thank you