For enabling HTTPS for Oracle Reports, the WebLogic Plug-In Enabled option in the WebLogic Administration Console should be selected for the WLS_REPORTS server by performing the following steps:
Log in to the WebLogic Administration Console.
If you have not already done so, in the Change Center pane, click Lock & Edit.
In the Domain Structure pane, expand the Environment node, and select Servers.
A list of servers configured in the domain is displayed.
Click the WLS_REPORTS server.
Expand the Advanced link near the bottom of the page.
Select the WebLogic Plug-In Enabled option.