Code works fine from local, doesn't work when i call from a application server

Hi,

Could some one help me?

From my java code i am trying to call    "https://projectdev.abc.net/PWA/_api/ProjectServer/Projects$expand=Tasks&$select=Tasks/Id,Tasks/Name" when we run the application in Weblogic server on Unix platform, i am getting “401 Unauthorized” exception. Interestingly, when i run it on a Windows platform, it runs fine without any authentication required.

Thanks in advance