@kanchil If you can ping hostnames of windows machines, there is a local dns working on your LAN. What does the dns entry look like in your ethernet/wifi properties? Have you tried manually...
@exactspace I would ask tp-link support if anything can be swapped, but if you are past a return window when you bought the units they would not necessarily be obligated to do so....
@exactspace Your deco s4's may have different hardware versions between them. Some versions of it don't have 1.6.1 listed. https://www.tp-link.com/us/support/download/deco-s4/v3.6/#Firmware
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