[Cannot login to store IE error ID 2909899]

I have a support question but this might attain to Marcom Central instead. Anyway here's my question.

 

I have a client who cannot login into our store. I have tried multiple teams using the same user name, password and same version of IE, 9.0.8112.16421 without a problem. He keeps getting an error ID 2909899. What's happening is that I have forced my client to change there password. Once he has done that and he tries to log back in then the error occurs. I've researched this put haven't come up with anything. Any Ideas?

 

Thanks

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