Can i install a network cable into the wireless routers lan port from one Sonos Port (1) and install a network cable from Sonos Port (1) to the other Sonos Port (2) lan port?

I attempted this but when I added the 2nd port it caused havoc. First I couldn’t get it added over Wifi, I had to wire it to Ethernet to get it added.  Rooms would disappear and reappear, the controller would hang when attempting to update software once I unplugged the 2nd port all went back to normal. Both ports were connected via Ethernet but not daisy chained. Any ideas why the 2nd port caused so much trouble?  Anyone got his to work?

You probably have an STP (Spanning Tree Protocol) issue in your switch(es) or router. 

Ironically this wouldn't have arisen had you daisy chained the two Ports together. 

Thanks for your response. Can you help me get this straightened out?  Should I factory reset port 2 then daisy chain it to port 1 and then add it to the system? Or is there another way to get the system to forget it in order to start over from the beginning. 2nd question: Port 1 is the only Sonos component which is wired. I have the wireless disabled on port 1. Should I keep it wired but enable wireless in order to get it to utilize boost mode or does it still do that even if it’s wireless is disable. Thanks so much for any help you can give me.  

Clarification; I don’t have a boost or a bridge. When I say “boost mode” I guess I really mean Sonos net   

You don’t need to factory reset the second port just to change how it’s connected, assuming it’s already been successfully added to the system.

You need to enable wireless on any Sonos device in order for its wireless radio to function. It won’t operate in ‘Boost mode’ until you do this.

Thanks so much for your help!  Daisy chaining port 2 to port 1 seems to have done the trick. And, no need to reset the new port 2. I did disable the wireless on port2 but enabled it on port 1 in order to get the system to utilize Sonos net (hopefully).