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We have been seeing a small number of reports recently, from Comcast Xfininty home internet customers, of a browser security error when attempting to access our proxied resources. If you are Xfininty customer running into this problem, we have a fix. Unfortunately it involves turning off a security feature.
Xfinity xFi Advanced Security is a feature that used to cost about $80 per year, but recently Comcast began to offer it for free, so people have been turning it on. If you do turn it on, along with its useful security features, it currently blocks access to the SU Proxy server, which you use whenever you access our online library databases.
If you turn it off, you should see this problem go away immediately. You can turn it back on when you are done with your research, or leave it off, whichever is convenient for you.
From Comcast Xfinity https://www.xfinity.com/support/articles/using-xfinity-xfi-advanced-security
Updated March 24, 2020