Textures and the rest of the sites are all working correctly for me at the moment.
All of the sites are hosted on the same server so if you can get to this one, you should be able to get to any of them.
just says Unable to establish a connection to the site.
The connection has been reset.
But you can get to the other Resource sites?
That doesn't make any sense. Try clearing your cache and cookies for textures-resource.com and see if that helps.
The same problem has been happening to me, and now it's preventing me from logging into websites other than The Spriters Resource because it immediately has to redirect to the Textures one for some reason. The website might be unfairly blocked in your region (assuming you are from Russia like me) since it's still accessible through VPN and web proxies, showing that it's loading for everyone else, hence the confusion.