Block a specific address via WiFi (and allow via Ethernet)?

Does anyone know of a way to block incoming connections from a specific IP address ONLY when using WiFi, but allow incoming connections from the same IP address when using ethernet?
Basically, like a micro-firewall. I've found myself in a situation dealing with a bug in our backup software (Retrospect—a once excellent Mac backup solution, now complete junkware that I wouldn't suggest touching with a 10-foot-pole) where it's trying to back up clients when they're on WiFi and the backups fail because it can't sustain the minimum speed threshold set.
There are two bugs I'm dealing with. 1) Retrospect Server is supposed to be IP-specific on the client side, but a bug is causing it to ignore the IP and just see "clients"; 2) Retrospect Server is supposed to "retry" backups again 30 minutes after a failture, but another bug is resulting in Retrospect not seeing the threshold failsures as a valid failure and thus doesn't attempt the retry. As a result, I'm having to manually monitor our mobile devices and manually push backups requests to them throughout the day. Very annoying, and a complete waste of time.
So, if I can find a way, on the client side, to block incoming pings from the server when on WiFi, but allow pings from the same IP when on ethernet, it'll solve my problem.
Ideally, I can do this command-line, without any third-party installations (so the users themselves don't notice anything, so I can push out through ARD, etc.).
Thanks,
Kristin.

Hi Brian,
Thank you for your question.
From error, the issue was occurred by sender instead of yours, we could contact Exchange administrator of sender to solve it.
We suggest if there are any restriction on this specific mailbox address.
If there are any questions regarding this issue, please be free to let me know. 
Best Regard,
Jim
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
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