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You can contact the register with the whois address details.

Contact your host, tell them you would like to temporarily remove your who is protection, maybe for at least 2 months. But its probably better off you leave your who is protected without interruption...

Simply said. Linux hosting is cheaper, because linux is free and windows (server) is not. If you want to host asp.net website, you don't have an option, because you need windows hosting.