Having the same issue and just spoke with Godaddy who said it's not a concern and that what's happening is Moz's software is pinging the client's server too many times within a given time period, so Godaddy's system is temporarily blocking Moz's IP, which causes the error. The do not ever, according to this rep, block Google's services that hit the server.
Best posts made by wcbuckner
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RE: 429 Errors?