I can't connect to most of the internet.

@jorick what troubleshooting steps have you completed? 
example: reboot modem via My Account app/call into customer service

Sorry that it didn't work for you. It's a pretty common occurrence around here lately, and disabling is the solution / work-around.

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@jorick wrote:

I can't connect to most internet sites.  About all I can connect to is YouTube.  I can't even connect to half of xfinity's web site, such as the outage map.  What's going on?

 

If I use my cell phone's hotspot, I can connect to all sites, so it's not the site's fault.

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Try disabling the Xfi Advanced Security feature for now as a workaround. It's buggy ! And there is currently no way to whitelist anything;

https://www.xfinity.com/support/articles/using-xfinity-xfi-advanced-security

I'm unable to access the xfi security area.  It's one of the sites that won't connect.

I finally got my computer to connect to my phone hotspot and disabled advanced security.  No change.

I unplugged the modem for 10 seconds.  After it came back up, no change.  I did this twice.