Unable to download Designer DVM

Hi expert,
I installed the Process Designer. I followed this rule:
First I was installing PDICT and then I could run it (Only I could open it on the server because I received a database error on my user PC).
Then I set up the Server edition of Process Designer and after that the user version and at last configured my clients etc.
Currently when I want to run Process Designer from the mid-tier, I find the following error message:
Although this might be now from the matter identified in the what’s New document. Mention that, we're using IE8.

Windows Internet Explorer
When I make an attempt to run the user I get the similar database connection error message like when I wanted to open PDICT on my Computer.
Process Designer

Now I am not sure what the reason behind this is. Please help me to solve this.
Thanks in advance.
