[airdave]

In response...but directed at anyone in general...

If you are having any problems accessing any part of the world (from your part of the world)
you should first contact your Internet Service provider and get an answer from them.

In most cases, they will be interested to know if there is an issue.
And may be able to sort it out for you.

Unless they themselves are doing the blocking, which you deserve to know (and why).
Then, you can start using a VPN, or find another solution.

In most cases this is not internet blocking, and just something related to your own system or the routing of your connection.
Have you tried rebooting/resetting your internet connection?
Thats always the first place to start with any internet connection problem.
*this is as simple as disconnecting power from your router/modem/etc.
Give it at least 10 seconds and then power back up.

Have you tried updating, uninstalling or reinstalling your browser?...or a new and different Browser?
Try uninstalling Browser plug-ins/add-ons.
Best way to do this is export your Bookmarks.
Uninstalling your browser completely, dumping any add-ons.
Install a new up-to-date browser from scratch.
Before adding any plugins or making any changes, try the connection to this site.
If it works, add your original add-ons and settings until you lose the connection, and determine what caused it.

Papermodelers.com is not a "secure" site.
Non-secure sites are now blocked by certain browser filters.
I started using the Brave browser a few weeks back which has many safety and security
features to block advertising, trackers and other unsafe and identity thieving mechanisms.
But one of the things it can do is block access to non-secure sites.
Whenever I can't access a site, I have to turn off certain restrictors to gain access.
I still have some sites I cannot access with Brave, and I switch back to much less secure Chrome or Firefox to do so.
There are settings that can be adjusted, and you can set-up the browser for sites you regularly visit.