cfx_http5 ERROR: 98. Could not allocate memory heap

Using cfx_http5 to check brocken links, it has been working for a long time. It stopped working recently, and I got the following error when I run this.

<cfx_http5
    url="a valid link goes here"
    async="Y"
    out="RESULT">

Error message produced: ERROR: 98. Could not allocate memory heap

Any advice on this issue or how to debugg it, would be very much appreciated.

Enviroment info:

• ColdFusion - Version 8 Standard
• server OS - Windows 2003
  
• webserver - IIS 6.0