Controller Client 401 unauthorized & login loop in Controller Web

[cognosnewbie]

Hello everyone,

I'm new to IBM Cognos Controller, and this is my very first installation on our server. I've followed the official IBM documentation for setup, but I've run into two issues that I can't resolve.

Problem 1 – Controller Client
When I launch the classic Controller client, I receive the following error:


The request failed with HTTP status 401: Unauthorized.
   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   at Cognos.Controller.ControllerSoapHttpClientProtocol.Invoke(String methodname, Object[] parameters)
   at Cognos.Controller.Proxy.Light.WSLight.CheckServerConnection(String sGuid, String sUser)
   at Cognos.Controller.Direct.ServerInfoD.CheckServerConnection()
   at CCR.AppContext.CheckConnectionToServer()


Problem 2 – Controller Web
When I access Controller Web in the browser at http://localhost:9085, I get a login popup. After entering the credentials, it refreshes and shows the same login screen again in a continuous loop.

Popup message:
The server is initializing, or the session has expired.
Please refresh the page in the web browser or log in.


Additional context:

The environment already has Cognos Analytics and Planning Analytics running successfully.

Has anyone experienced these issues during a fresh installation? Any guidance or troubleshooting steps would be greatly appreciated.

Thank you!