cannot use machine name for url

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I copy my web application to another machine for testing.
When I use http://localhost/AppName to test, it is run ok.
But if I use http://xxxx/AppName to test, it always login fall(xxxx is the
machine name)

What is the problem

 

[Guest]

in C:\WINDOWS\system32\drivers\etc you will find HOSTS.
This file contains the mappings of IP addresses to host names.