If the web server is incorrectly configured, you will find you can get to the Anaplan XL Reporting Web application but can't open any reports.
In this case, please check:
Anaplan XL Web Edition Prerequisites – particularly the HTTP-Activation item.
Publishing Troubleshooting – the web.config may be incorrectly set up.
Web server memory usage – if this is above 95%, then web service activation may be disabled by IIS. If this is the case, an entry will be made in the Windows event log.