Thanks @Just-Lisa-Now-   You were right - looks like @HelenC is good now, based on the info in this post: https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/re-can-t-update-my-pros...

Short answer - if you're a Comcast/Xfinity customer, turn off "Protected Web Browsing".

If you're not, you'll need to check firewall settings and/or router settings.

See this post for technical details on why this might be happening.

https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/does-proseries-have-a-c...

I'm hoping to address this permanently on our side, but won't deploy until mid February because we don't want to risk  breaking something right before EF Go Live. After that point you should be able to turn "Protected Web Browsing" back on. In the meantime you might consider other options to protect browsing. For example, I use a Netgear NightHawk Router with Defense baked into that, as well as Circle to further restrict what my kids get access to.