This whole thread seemed very familiar.
A search turned up another thread about the same website from 18 months ago:viewtopic.php?f=10&t=16743&p=56524
The conclusions were more or less the same:
- Redpocket seems to be blocking some sonic IPs for unknown reasons
- There isn't really a way to fix this on sonic's end
- It's unclear who to contact to get it fixed by redpocket