Has anyone experienced internet connection problems through Comcast after taking a recent Apple security download?

Has anyone experienced internet connection problems through Comcast after taking a recent security update download from Apple??

Hello jessie029, and a warm welcome to the forums!
What browser do you connect with?
Safe Boot from the HD, (holding Shift key down at bootup), it will try to repair your Disk Directory while the spinning radian is happening, so let it go, run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, then Open System Preferences>Network>Configure>Proxies Tab, make sure none are set, like for HTTP & HTTPS to use at Home, if you use it at 2 locations, just make a New Location for home.
Make a New Location, Using network locations in Mac OS X ...
http://docs.info.apple.com/article.html?artnum=106653
Then try putting these numbers in Network>TCP/IP>DNS Servers for the Interface you're using...
208.67.222.222
208.67.220.220
Then Apply. These are safer/faster than most ISP's DNS numbers, and have been patched against DNS poisoning.
https://www.opendns.com/homenetwork/start/device/apple-osx-tige
How to Flush DNS in Mac OSX using the Terminal.
In Mac OSX versions 10.5.1 and before, the command lookupd -flushcache performs this task:
lookupd -flushcache
Reboot.

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