Modem mac locked

My COMCAST Cable Modem worked great for over a year - I have it hard-wired to my Apple iMAC and my wireless router with no problems. I could also hard-wired to other notebooks as needed. All of sudden the modem became MAC locked and I can only get service when directly hard-wired into my iMac. Does anyone know how I can fix this?
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  1. This topic has been moved from the section Toms Network to section Networking by Grumpy9117
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