Client found response content type of '', but expected 'text/xml'. The request failed with an empty response.

I received the above error on the SQL Server 2008 R2 Reports Server alonhg with CRM 4.0, after going through many web sites and blogs could not find a proper reason. Ultimately found that the disk which SSRS is installed has ran out of disk space. This is just a lazy blog post to make sure someone else will find the answer straight next time.

Check your Disk space buddies!!!