Imac OS X OS X El Capitan 10.11.6 – ethernet connection to modem not working

New Modem can’t connect via ethernet cable – but can wireless – want to connect via ethernet

Checked cable good – iMac port ok – swapped modem port still no – used Dell laptop to connect via ethernet and wireless and all good – so assume somethings blocking me.

Restarted several times during all above processes, also re-started modem several times, and reset.

Read somewhere that it could of been a software update that breaks the ethernet connection, but patch link no longer works.

Apparently this was a common problem, with patch, but can’t find fix, please help.

Running a iMac 2011, OS X El Capitan 10.11.6 –

Please don’t suggest update – long story due to programs running

Here’s a link

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