I get the error "Response object error 'ASP 0156 : 80004005'. Header Error. The HTTP headers are already written to the client browser. Any HTTP header modifications must be made before writing page content." when trying to view most of the pages on the web reports.

Article ID: 161

Category: Web Reports

Applies to: 2.90

Updated: 2012-02-07

This error is displayed by IIS when buffering is turned off for the virtual directory. Please follow the steps below to enable buffering for the virtual directory:

IIS 6
1. Open Internet Information Services (IIS) Manager in the "Administrative Tools" folder.
2. Navigate to Web Sites - Default Web Site - EventSentry.
3. Right-click EventSentry and click the Configuration button under "Application settings".
4. Select the Options tab and ensure that Enable buffering is checked.
5. Click OK to save the settings.

IIS 7.x
1. Open Internet Information Services (IIS) Manager in the "Administrative Tools" folder.
2. Navigate to Web Sites - Default Web Site - EventSentry.
3. Double click ASP.
4. Under the behavior heading set Enable Buffering to True.
5. Click apply (top right corner).

All pages should now display correctly.