Need more info.
How did you "migrate" ? try re-install FM11
What error do you get? Do you open port 80 or off firewall?
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I think you have a operation system that is not supported by FileMaker 11 or that in your updating closed IWP ports that needs to be open to be able to use IWP
But never the less, I really recommend you to update to FileMaker 15. Better security, performance and a lot of nice nice way of communicating with your users using FileMaker WebDirect