Getting HTTP Error 500.21 - Internal Server Error

Getting HTTP Error 500.21 - Internal Server Error

When you try to run MVC site or ASP.Net framework 4 website, if you receive the following error: HTTP Error 500.21 - Internal Server Error. Saying Handler "ExtensionlessUrlHandler-Integrated-4.0" has a bad module "ManagedPipelineHandler" in its module list. It means the ASP.Net has not been properly registered on your IIS.
How to fix Open DNS Resolver issue on your windows server?

How to fix Open DNS Resolver issue on your windows server?

If you have a VPS or a dedicated server and the DNS Server is available, you must take a precaution on protecting your DNS server from DOS(Denial of Service) or DDOS(Distributed Denial of Service) Attack. The attacks can be done by sending huge fake volume queries to your DNS server so it can cause performance degradation on your server. To overcome this problem, you can do the following actions on your server
How to allow loading and downloading json file in IIS?

How to allow loading and downloading json file in IIS?

In order to allow loading and downloading json file on your site, you have to add json extension in mime type and handler mappings in IIS windows server. By default this extension is not view-able. Therefore you will need manually mapping json extension into your IIS. To do this, you must have to get an access to your IIS, if you do not have, please request your site administrator to add this extension for you. For users host their sites on GoDaddy or other web hosting providers will need to contact their hosting provider.