Unable to run update - fails with Connection timed out

Hello,

I am using shared hosting account for a website running backdrop. For the past month updates have not run - scheduled or manually. I get the following error:

HTTP request to https://updates.backdropcms.org/release-history/backdrop/1.x?site_key=rd... failed with error: Connection timed out.

I contacted support pointing to the possible IPv6 check here: https://forum.backdropcms.org/forum/error-when-trying-check-updates 

Support responded: 
When I use this from cpanel under the terminal section -- curl -6 https://updates.backdropcms.org/release-history/backdrop/1.x to test ipv6 connectivity from the server to that subdomain. I was able to do so without issue so I believe your issue may be something else.

Not sure what I need to do next if I can't run updates. Would appreciate any advise/suggestions.