It's a possibility you have been banned http://www.skyblock.net/categories/appeals.195/ Post an appeal here
If it's for skyblock.net here: http://www.skyblock.net/forums/net-appeals.192/ Press create new thread in the top right corner. Make sure to follow the format
If it's for skyblock.org here: http://www.skyblock.net/forums/org-appeals.193/ Make sure to do the same as what I said above, follow format. Remember, don't lie in your ban appeal. Honesty is the best policy
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