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Asked: 2026-05-12T13:21:50+00:00

I am developing a web application using Asp.net mvc framework with concept of sub

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I am developing a web application using Asp.net mvc framework with concept of sub domain for community.

I have implement concept of wild card mapping of domain like *.example.com. To test concept in vs 2008 i edited hosts file and add some sub domain like

127.0.0.1 a.localhost

127.0.0.1 b.localhost

When i request url http://a.localhost:1760/ i get error

While trying to retrieve the URL: http://a.localhost:1760/

The following error was encountered:

Unable to determine IP address from host name for a.localhost

The dnsserver returned:

Name Error: The domain name does not exist.

This means that:

The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.

What i should do to resolve this error.

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1 Answer

  1. Editorial Team

    localhost can’t have subdomains – it’s a reserved DNS name that simply doesn’t support them. You could, instead, use a.myhost.example and b.myhost.example, but be aware that Cassini, the VS development web server doesn’t understand host headers.

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