See our documentation here if you receive an error: Access is denied when trying to access the testconfig. 

Blackbaud NetCommunity 7.1 has a variety of new features and enhancements to provide for additional security for your website. Beginning with this release, the testconfig.aspx page was hidden from public access to secure any sensitive environmental configuration information that may have been displayed on the page. 

If your organization hosts your Blackbaud NetCommunity website, the testconfig page can still be accessed locally directly on the Blackbaud NetCommunity web server following these steps:
  1. Remote into the Blackbaud NetCommunity web server
  2. Launch a browser on the server
  3. In the navigation bar, type either the fully qualified domain name or localhost followed by /testconfig.aspx. For example:
    • http://localhost/testconfig.aspx
How is the NetCommunity site hosted?