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I have the following setup:

Basement: TP-link AC1750 repeater with NAS plugged in via cable.
Ground floor: TP-link AC3200 router
1st floor: TP-link AC1750 repeater
2,4GHz and 5GHz networks share the same SSID

On the 1st floor i have a home office with an iMac. As the signal is strongest from the repeater I assume that the iMac has connected via it.
The iMac is unable to connect to the NAS in the basement even though it's companion app RAIDar sees the NAS and correctly lists it's IP. I cannot access the admin page through RAIDar either.

My old setup using Airport Express and one Airport Extreme worked without issues (traded up for speed and extra range).

What could be the problem?

Best regards
Geir Rosset
Oslo
Norway