For future readers of this thread, if this message does pop-up, please contact the admin as the message states. There may or may not be a reason for your proxy to be blocked so it is important to follow-up with the correct contact(s). Using a 'proxy unblocker' is quite evasive so I do not recommend using one.
If you do choose to write a RMS review, thank you (regardless if it is positive or negative)!