If after a CMon 19.8 installation (fresh install or upgrade install), you see the issue where all CMon web pages display error as 'HTTP Error 500.19 - Internal Server Error' with 'Error Code 0x80070021', then read this KB article to workaround that. The error for this specific ase would look like this:
CMon 19.8 may require using IIS Manager to change a Feature Delegation setting to set Modules and Handler Mappings to Read/Write, instead of Read Only (which likely at least one of those items will be set to Read Only), if you experience the 'HTTP Error 500.19 - Internal Server Error' with 'Error Code 0x80070021' issue with loading CMon 19.8 web pages. Note: This info is also detailed in the 19.8 System Requirements .PDF.
This how-to video covers how to resolve that issue with two methods of workarounds, until we can take care of the bug by making a change in the installer in a future NovaBACKUP CMon release. How to install the IIS feature and Web Server roles in Windows Server Manager, and what to check to make sure the Feature Delegation settings are set properly. Installing all of the IIS Web Server and Web Server Roles as covered in the first part of the video will make it so you do not need to set the Feature Delegation permissions for Modules and Handler Mappings, as the installation of the Web Server Roles will take care of that for you. CMon 19.8 contains two IIS Modules and Handler Mappings permission related Feature Delegation settings requirements, and this guide covers how to verify and set that, either by installing all of the Web Server roles properly as covered in the first half of the video, and the second half contains how to verify and check those two item permissions, and set them properly if necessary (to be utilized also if you can't or don't want to install all of the Web Server roles that we recommend). If these two Feature Delegation items are not set properly then the CMon likely won't even show the login screen or get to any web page after installing.
As a primary workaround to take care of the current issue since the CMon 19.8 installer does not do it for you (unless you install all of the Web Server Roles that we show you in the first half of the video), you can follow the simple steps in the second half of the video where we show how to change the Feature Delegation for the Modules and Handler Mappings items to verify if they are already set to Read/Write, and if one of them or both are set to Read Only, we then show you how to change them to Read/Write.
As a secondary workaround to take care of the current issue since the CMon 19.8 installer does not do it for you, the following Web Server Roles in the Server Roles area of Windows Server Manager can be added which will resolve the issue. This is what is covered in the first half of the video, and they are these items to install, or verify that you have them installed, via Windows Server Manager:
CMon 19.8 requires Web Server (IIS) feature and Management Tools - IIS 6 Management Compatibility. To take care of the issue described in the title, if you don't want to utilize the primary workaround to change the Feature Delegation settings, you can add these Web Server Roles in the Application Development section via Windows Server Manager: .NET Extensibility 3.5, ASP, ASP.NET 3.5, ISAPI Extensions, and ISAPI Filters. Then you can reload the CMon web page or the shortcut, or you can install CMon 19.8 if it is not already installed, and it should load the web pages just fine.
Note: We will be looking at fixing this in the CMon installer, in a future release of NovaBACKUP CMon, so that neither workaround is necessary to perform to fix this bug issue.