The application I working on is developed on top of SharePoint 2007 environment, the issue I faced is in CA's Search Administration, all the items like Content Source, Scope and etc cannot click, when I clicked on the link, it hit the error below.

I've login with admin with sufficient rights to access the page, and I verify the files was in layout folder, wonder why it will hit page not found issue. No suspect log was captured in Event Viewer as well. There is also no major changes recently as well.
Please advise where should I start troubleshoot?
Thank you in advanced.