Limited internet access via wifi
My iMac is limiting which web pages I can now view/load. Using the diagnostics feature it says my connection is fine. My other devices connected via wifi are not having any issues. I have restarted all hardware in attempt to reset but no changes to my access. Same results when using Safari or Chrome. This just started today. Help please!
iMac (27-inch Mid 2010), OS X Yosemite (10.10.5)