Please contact firstname.lastname@example.org with your username, and request that they unblock it. The most common reasons that people are usually blocked are the following:
- The user was using Cloud9 as a hosting service (hosting their website, game server, etc.)
- The user was running bots on Cloud9, sometimes attacking websites or spamming online accounts
- The user attempted to attack any website, or use penetration testing tools that could cause damage to a service, from the Cloud9 service
These are some basic common sense reasons, if you have time, you can find further restrictions in the Cloud9 Terms and Conditions.