I had such problem too with Supermicro (intel x553) adapter.
I found that kernel module 'ixgbe' have parameter: allow_unsupported_sfp.
So...
# rmmod ixgbe
# echo "options ixgbe allow_unsupported_sfp=1" > /etc/modprobe.d/ixgbe.conf
# modprobe ixgbe
Now connection works with my Cisco DAC
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