Hmm, could be a few things. My guess is whatever Web Server sott.net uses refuses the connection from your VPN provider. They probably have some type of firewall/filtering setup that looks at the source IP, and blocks it based on something like source country or known VPN they don't want to accept connections from. Do you know which country your VPN provider resides in? You could try a different VPN service, if there's a free trial of one you could test it without spending any money. Or if your VPN service has a choice of which servers to use, you could use a different server.
You could also try resetting the cache in Chrome.