This is because the website you are trying to access has not been added to the allowed list.
Please first ensure the proxies are able to access www.ipchicken.com. If you receive an access denied error message on ipchicken.com, this means your IP is not authorized.
In this case, you need to login to proxy control panel and add your new IPs under authenticated IPs link.
If you are able to access ipchicken.com but unable to access other URLs, that means the website URLs are not added to our allowed list.
Please login to the proxy control panel and add the website URLs that you need access to by clicking on WHITELIST in the control panel.
Please read the getting started info on the control panel before adding URLs.