I have a website set up w/ Friendly URL and has been running okay for a while now, recently one of the tabs fail to load at all if you tried to access it using friendly url

e.g. http://www.testsite.com/Section/tabid/56/Default.aspx - it gave me Internet Explorer cannot display the webpage error

but it work when I typed in non-friendly url www.testsite.com/Default.aspx?tabid=56

Odd thing is, this only happen on one section and all its children page.

All the other section works fine.

Anybody have any idea on what's happenning. 

I'm running IIS 6 on Windows Server 2003 and the UsefriendlyUrl set to Y