This is caused by not enabling Integrated Windows Authentication in Internet Information Services (IIS) for both the PaperVision Enterprise website and the PaperVision Authentication Gateway website. Users will be redirected to the login screen instead of being automatically logged in. Once a user enters their login credentials they receive an Error: -28000 Unable to open request. (Source: HTTPHandlerEx.PVDM System). One way to resolve this error is to browse to http://GatewayURL/AutoLogin.aspx instead of just http://GatewayURL. Another way to resolve this issue is to enable Integrated Windows Authentication for both the PaperVision Enterprise and the PaperVision Authentication Gateway websites. This article documents the steps necessary to enable Integrated Windows Authentication in IIS.

Follow these steps to enable Integrated Windows Authentication in IIS 6:

1. From the desktop, right-click My Computer, select Manage.
2. Select Services and Applications and then select Internet Information Services.
3. Open websites, right-click on the PaperVision Enterprise website, and select Properties.
4. In the Properties window, navigate to the Directory Security tab and click the Edit button in the Authentication and access control section.
5. In the Authentication Methods window, enable (check) the box next to Integrated Windows authentication and click OK.
6. Right-click on the PaperVision Authentication Gateway website, and select Properties.
7. In the Properties window, navigate to the Directory Security tab and click the Edit button in the Authentication and access control section.
8. In the Authentication Methods window, enable (check) the box next to Integrated Windows authentication and click OK.
9. Once both websites have been updated, restart both sites in IIS.

Follow these steps to enable Integrated Windows Authentication in IIS 7:

1. From the Start menu, select Programs > Administrative Tools > Internet Information Services (IIS Manager).
2. Expand the server name, then expand Sites, and highlight the PaperVision Enterprise website.
3. From the IIS section, double-click on Authentication.
4. Right-click Windows Authentication, and select Enable.
5. Highlight the PaperVision Authentication Gateway website.
6. From the IIS section, double-click on Authentication.
7. Right-click Windows Authentication, and select Enable.
8. Once both websites have been updated, restart both sites in IIS.