One of our vendors websites is pulling up a 403 forbidden error only from devices connected to our network. Emails to the same domain are also being blocked. Turn off wi-fi and they load through the cell network. As far as I know the switch is unmanaged and this issue just started happening overnight. Our stupid outsourced IT team put web-filtering softwares on the PCs but it does not pull up that block page AND the page loads a 403 forbidden on our personal devices as well. Thoughts?