You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
We've beefed up the firewall protection in recent weeks which apparently has some occasional false positives. If you PM me with a copy and paste of those "Access denided" details, I can try to zero in on which rule is being triggered.