if connected this cable connection serves same function as the 4 port connections on your router.
So still the question is: is your router's SSID (it's name on wifi) the same as before and is the password the same. You can check with your phone if you see your router.
Then for the wired, only thing i can think of is that all other connected devices are in a different ip range and unless restarted will not use the routers ip range until the lease time expires or forced renewed by a stop/start of the device.
So for both models for them to operate the routers SSID/password combination must be configured in both models.
If they don't work something changed on the wifi setup. You might have forgotten to save the settings.....and applied the actual configuration without doing so.
Verify your wifi ssid from the main router using your phone. It should all be as before you rebooted. If not for sure you forgot to save the settings. Applying a configuration will not safe it in dd-wrt.
Unsure if your server is connected to the router or any of these wireless repeaters.
So came back to this and for some reason yes I can see the ethernet repeaters on my network (I have 3)
Problem I face now is finding my Ethernet IP for my tower server which appears to be being omitted, maybe because its manual DHCP IP address is conflicting, if I run into problems I'll be sure to come back to let you know.