Why does web applications trends tab show "waiting for initial data"?

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Issue
After upgrade from PME 9.0 to PME 2020, the trends tab in web applications shows "waiting for initial data" forever and will not populate with data from meters.

Product line
PME 9.0
PME 2020

Cause
There is a problem with the Internet Information Services (IIS) configuration files and they will need to be manually deleted.

Environment
PME web applications

Resolution
First check to see if there is real time data for the device in question. If there is no real time data available, then trends will display "waiting for initial data". Once this is checked, follow the steps below to resolve this issue.

Uninstall IIS
After un-installation of IIS, Windows Process Activation Service (WAS) will also need to be uninstalled
Then delete the files or rename the folder for "C:\inetpub" and "C:\Windows\System32\inetsrv"
To reinstall IIS, just follow the same steps: Install IIS as well as WAS
Next, run a reconfigure of the PME software
Re-install the security certificate for web applications (if there was a certificate to begin with)

A detailed guide showing how to uninstall IIS and WAS can be found HERE.
A detailed guide showing how to install IIS and WAS can be found HERE.