Error Creating Proxy from WSDL. Unknown error.

[#1]

Hi,

I'm attempting to create a new API proxy and I'm having difficulty importing the WSDL for the service.

The WSDL source is:

https://webservice.s7.exacttarget.com/etframework.wsdl

The error message is:

'Error Creating Proxy from WSDL

Unknown error.'

As a debugging measure I have attempted to save the WSDL to a file and import too.

Can someone point me in the right direction?

Thanks,

Mike