ASP 500 Error with Code 0x800700aa While browsing a .asp page

Problem :

Some times you try to browse a simple ASP page (Legacy ASP) hosted on IIS 7.5 or IIS 8.5 and you run in to following Error : 

Detailed Error Information 
Module IsapiModule 
Notification ExecuteRequestHandler 
Handler ASPClassic 
Error Code 0x800700aa 
Requested URL http://localhost/New_Site/Default.asp 
Physical Path C:\inetpub\wwwroot\New_Site\Default.asp 
Logon Method Anonymous 
Logon User Anonymous

You try all the other options like Enabling 32 Bit, Changing AppPool Pipeline mode to Classic, installing .net framework 1.1 or 2.0 but it doesn't help. 

Diagnose the Problem : 

 To find the main reason of this problem you will need to run Process Monitor and filter the logs to see only ProcMon Logs related to w3Wp.exe. 

While digging the logs, you may find some logs similar to following : 

12:31:49.0797868 PM    w3wp.exe    8264    CreateFile    C:\Program Files\McAfee\VirusScan\scriptsn.dll    PATH NOT FOUND 

 

                                                                        OR

12:31:49.0797868 PM    w3wp.exe    8264    CreateFile    C:\Program Files\McAfee\VirusScan\scriptsn.dll    PATH NOT FOUND  

Now the question is, why an asp file request is calling a .dll file which is related to to McAfee AntiVirus program.

Some times , when McAfee is installed on your server or Updated , it add this DLL as part of there ScriptScan feature  to intercept the script calls before they are executed on following Regresty Key : 

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B54F3741-5B07-11cf-A4B0-00AA004A55E8}\InprocServer32 
    (Default)    REG_SZ    C:\Program Files\McAfee\VirusScan\scriptsn.dll

In normal Conditions, this Registry Key (CLSID - HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B54F3741-5B07-11cf-A4B0-00AA004A55E8}\InprocServer32 ) points to VBScript.dll but here it is pointing to C:\Program Files\McAfee\VirusScan\scriptsn.dll. And this is the reason, ASP files are not being processed when requested.

Resolution : 

To Resolve this issue you need to perform following tasks : 

•  Open Registry Editor 
• Navigate to :   HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B54F3741-5B07-11cf-A4B0-00AA004A55E8} 
• Right Click and Select Permissions 
• Click Advanced 
• Click on the owner Tab 
•  In the “Change owner to ”  Administrators 
• Click Apply can click OK 
• The Select Administrators in the list of accounts under ” Groups or User names” 
• Click the “FULL Control” 
• Click Apply and OK 
• Now Double click on InprocServer32 and Modify its value as "C:Windows\system32\vbscript.dll".
• Click OK and come out or Registry settings.
• Recycle the application Pool serving your application or Reset IIS if necessary.

VOILAAAAAAA !!!!! It Works !!!!!!

Cheers!!!