Configure the ISAPI connector on Windows - Enable the ISAPI-dll Handler
Task: Enable the ISAPI-dll Handler Task Summary Complete this task to enable the ISAPI-dll handler using the management console. In the tree view pane, select IIS 7 (referred to as Server Home). The IIS 7 Home Features View opens in the Double-click Handler Mappings. The Handler Mappings Features View opens. In the Group by drop down box, select State. The Handler Mappings are displayed in Enabled and Disabled groups. If ISAPI-dll is in the Disabled group, right mouse click and select Edit Feature Permissions Ensure the Read, Script, and Execute check boxes are selected. Click OK to save the values and close the Edit Feature Permissions window.