How can someone get banned?

Well I have a problem, one of my customers who just signed up a day ago says that after he paid then he had changed the dns on his domain after that point he says he cant connect to any of our sites. This is also just happening to him and no one else has reported any down time. He just found out recently he could view the site threw a proxy with no problem. Could it be that he got accidentaly banned some how? Like threw iptables, and is there any way that I can edit the iptables?

Thanks

 

 

 

 

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