The best troubleshooting approach in such cases is to use the browser's console Network tab or Fiddler and check the failed requests. Thus you can see if relative paths (for JS/CSS/HTML files and the viewer's serviceUrl) in the application are resolved correctly.Then test if the running IIS process has proper read/write access to the cache storage defined in the service's CreateCache method. Also check all connection strings are copied correctly and allow access to the database from the new machine.
Verify all verbs are allowed by the IIS configuration.
If you need further help, please inspect with Fiddler the requests and send us the created log(SAZ) file, including a demo project where the problem is reproducible. Check also the server's Event Viewer for any logged errors from the application.
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