The following question has been deleted because I copied and pasted it: https://webmasters.stackexchange.com/questions/7356/one-subdomain-is-not-working/67611#67611
I have edited it. I think it fits the rules now, but I can't undelete it because I was deleted by a moderator.
I can't write a new answer because the question is on hold.
Any suggestion or something I should know?