Unable to create any Webapp & Site Collection on SharePoint 2013 due to error 404

404 page not found Error while creating webapp & new site collection on it​.

After a number of web applications have been created in the SharePoint 2013 farm, further attempts to create a new web application through Central Administration result in the following:
The creation process results in a ‘Page cannot be displayed’ message.
The web application is only provisioned on the Central Administration server.
But if you try to create a site collection on this newly created web app, it fails. Reason is it is not completely done.
After struggling this for a while I found you can resolve by increasing the Shutdown time limit in IIS to a greater value.

Steps taken to resolve issue :

Go to application pool of Central Administration.
Right click on it and go to Advanced Settings
In the Process Model section, increase the shutdown time limit to 200 for example.
It is a good idea to restart IIS now.

After searching on net for a while I found that the reason is during the web application creation process IIS is reset and by default. It allows the “Shutdown time limit” which by default is 90 seconds. Sometimes this might not be enough. And hence it forcibly shuts down in 90 seconds.

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