After installation of SDL Tridion Sites 9 Content Manager, the GUI comes back with "HTTP Error 500.19 - Internal Server Error"
![CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support](https://support.novabackup.com/hc/article_attachments/4419355464977/mceclip0.png)
CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support
![Web Portal - HTTP Error 500.19 with Error Code 0x80070021 When accessing WebPortal (Windows 2008 - Vista - 7). – Print Manager Web Portal - HTTP Error 500.19 with Error Code 0x80070021 When accessing WebPortal (Windows 2008 - Vista - 7). – Print Manager](http://www.printmanager.com/management/files/FAQ_Resources/97/97_1.png)
Web Portal - HTTP Error 500.19 with Error Code 0x80070021 When accessing WebPortal (Windows 2008 - Vista - 7). – Print Manager
HTTP Error 500.19 – Internal Server Error..." when browsing Revit Server Administrator panel (or SVC files)
![CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support](https://support.novabackup.com/hc/article_attachments/4419355478801/mceclip2.png)
CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support
![CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support](https://support.novabackup.com/hc/article_attachments/4419356639633/mceclip4.png)
CMon 19.8 installed with IIS shows 'HTTP Error 500.19 - Internal Server Error, and Error Code 0x80070021', on load in web browser – NovaBACKUP Support
![Web Portal - HTTP Error 500.19 with Error Code 0x80070021 When accessing WebPortal (Windows 2008 - Vista - 7). – Print Manager Web Portal - HTTP Error 500.19 with Error Code 0x80070021 When accessing WebPortal (Windows 2008 - Vista - 7). – Print Manager](http://www.printmanager.com/management/files/FAQ_Resources/97/97_6.png)