Can't establish internet connection with Ethernet/Thunderbolt adapter.

Hello,
Ever since I update to OS X Mavericks, I can not connect to the internet on my iMac Pro Retina 15-inch. I had to purchase the Ethernet to Thunderbolt adapter because the iMac pro Retina does not come with an Ethernet connection port. When I first purchased the Laptop, I connected to the internet automatically. However, now I keeps getting a message that the cable is not plugged in. I did hook the Ethernet cable to a Windows laptop and it connected right a way. So I'm positive it's the cable from router to computer is working. Also, the Thunderbolt port is active because I plugged a external HD into it and it mounted. The ability not to hook up to the internet is baffling. I have a Motorola cable modem, connected to Linksys router. I have two computers and one printer plugged into the router. That leaves me one Ethernet Port. When I hook up my iMac Pro Laptop using the Ethernet to Thunderbolt adapter, nothing happens. I'm not connecting to internet.
Any ideas, will be greatly appreciated.
Dennis

Thanks everyone for your help and comments!
However, I still had to call tech support to solve the issue so I wanted to get back to everyone with the solution.
First, it had nothing to do with Mavericks! Basically, it was a case of IP addresses being assigned by my modem and router. We first re-booted the modem and router and got the macbook pro to finally recognized an etherport connection. However, it wouldn't assign the IP address to the etherport, that's because I didn't click the apply button. Once I did that, the macbook pro was working on ethernet, but I lost WI-FI on the macbook. Ugh! Also, my iMac desktop lost ethernet port and stop working. So, I used the network assist me on the desktop and got to the point where it wanted me to reset everything again. So, I unplugged the modem and router, waited 45 secs, then powered up the modem and then powered up the router. Everything is work Great. The desktop, macbook pro (both ethernet and wi-fi), my wife's PC Laptop and our network printer! Therefore, the solution in my case was to restart modem and router twice to get all the computers assigned the correct IP address. I hope this helps someone out there!
Thanks again everyone for your comments ... very much appreciated!
Dennis

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Can't establish internet connection with Ethernet/Thunderbolt adapter.

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