Q: Windows 10, Apple Software Update: "server could not be found"?

I've started having an issue with Apple Software Update after replacing my boot hard drive with El Capitan + Windows 10 on Boot Camp. I used Carbon Copy Cloner and Winclone, and both partitions work seamlessly and flawlessly. This is the only issue that's come up in Bootcamp. The prompt is: "The Apple Software Update server could not be found. Check your Internet settings and try again." I do have Symantec Endpoint Protection installed, but I also had it installed before the HD replacement, and didn't have this issue then. I've tried tweaking w/ its settings and adding the ASU app to exceptions, but it doesn't seem to make a difference. I've also looked around and attempted adding pings to the 'hosts' file, but this didn't make a difference. Repairing the app doesn't either.