So my iMac can not connect to the internet after uninstalling norton internet security.
internet is good and did not have this issue before. I have Big Sur 11.1
Did you just drag and drop Norton to the Trash, and think it was completely uninstalled, or did you follow the vendor's complete uninstall instructions? Not fully removing Norton can potentially cause issues, though whether one of them is loss of network connectivity is hard to say as I use no AV products.
The following previous discussion may help. Click the arrow beside "Helpful Answers" and select "All Replies" in Uninstalled norton 360, now I can’t conne… - Apple Community