Exchange 2007 - The XML document ended unexpectedly.

Hello,

I'm trying to connect with a exchange server 2007 sp3 through EWS. 

I can connect but when I try to retrieve a calendar item I'm getting this error: 

The XML document ended unexpectedly.

It seems that the EWS/Exchange isn't well configurated.  

I tried it in the EWSEditor and the result is the same. 

I checked the connectivity in the shell and all the results were ok.

Any new idea to test?

Thanks!