This error usually occurs because your account has IP authentication turned on. This means that the API will only accept requests from the IP addresses you have listed - requests from any other address will be rejected.
To fix the problem, you can either add the additional IP address(es) you are using, or turn IP authentication off. To do this, log into your account and select IP Authentication from the Account drop-down menu.
Article ID: 60
Category: Using Our Services
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