Symptoms

We have got K2 blackpearl for SharePoint has been installed successfully and it is visible on the site content, When I am trying to browse settings.aspx page I am getting 404 error message The requested error is not found.
 

Diagnoses

Fiddler trace indicated that there is likely an issue between sharepoint and the DNS.
 

Resolution

From client: "As soon as I remove host name from one of the SharePoint web applications it started working".