IIS7 error 400.17, or 400.3

Hi,After installing new machine (Windows server 2008 32 bit), VS 2008, BizTalk 2009, etc', we tried to run some WCF service (which works on other machine), and got this very error: 400.17. First time I saw this error a year+ ago, and forgot about it. Now, scratching my head, started googling, and (at least I do admit) forgot how to solve the error.But! When started reproduce all installation