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I have comcast and have been getting the can't connect message since early yesterday on all of my computers.
Gee, did anyone contact Comcast for help?
It's working now for me in the UK, so the MS servers seem to be OK.
Redbatman's post shows that you should actually getting the content from an akamai.net server. This is what's called a Content Delivery Network (CDN), a network of local servers that (in theory) allow content to be delivered faster by serving it to you from a local (to you) mirror server rather direct from MS.
It seems Comcast's DNS lookup may not be connecting you to a CDN. You may be able to connect successfully if you change your DNS server from the Comcast one to one such as Google's 8.8.8.8.
Change IPv4 and IPv6 DNS Server Address in Windows | Tutorials
The MS techs remotely connected my machine and changed DNS address under IPv4 to 4.2.2.1/4.2.2.2 then it worked although everything is very very slow with updating.
Go to Network & Internet > Change adapter options > Right click your network device > Properties > Internet Protocol Version 4 (TCP/IPv4) > Change DNS to 8.8.8.8 and 8.8.4.4 per Bree's advice on addresses.
Last edited by andyouf; 31 Jan 2019 at 03:18.
Using Comcast here in NorCal and setting the DNS to 8.8.8.8 and a reboot did the trick!
Thanks @Bree
Change IPv4 and IPv6 DNS Server Address in Windows | Tutorials
Things still not ok in UK (BT). Definitions still not downloading. DNS should not be a forced workaround. MS has to fix for the masses
I am having this problem as well. I believe it has something to do with DNS, because when I switch from my home network to my cellular network by tethering my phone, updates will run. I am at a loss on how to resolve this though.
Tried the 8.8.8.8 and 8.8.4.4 and it works.
Last edited by Ksaul505; 31 Jan 2019 at 02:32. Reason: DNS switch worked