Hi,
The server was blocking your request because you were connecting from a known spamming IP address. This means that an external blacklist has listed the IP address you were using as being a source of malicious activity, due to a previous attack on another website. While this blacklist is usually an effective way of protecting our customers' websites from known threats, some people can legitimately see this error message if they are sharing a connection with someone else. Examples of these situations include proxies, VPNs, mobile connections, and some workplaces.
You might be able to find more information by entering your IP address at:
http://www.stopforumspam.com/
Thank you,