You receive "The requested resource is in use." error message when browsing ASP pages

From time to time, you will get this error msgs when browsing ASP pages on both IIS 5 and IIS 6. In IIS 5, you might be able to fix it with this kb Cache ISAPI Application Option Causes ASP to Return Error. However, I have seen many times that this KB didn't solve the problem and you continue to get the above error msgs. Especially with IIS 6. The possible cause for this is vbscript.dll reference in registry got messed up and you need to re-register it. Try - regsvr32 %windir%/system32/vbscript.dll.