Got 404 erro when open Web application

Question

I create a web application: http://webapp.com 
and created some site collections:
http://webapp.com 
http://webapp.com/it
http://webapp.com/hr
but I got 404 error when open  "http://webapp.com" ;
and got the below error when open "http://webapp.com/it" or "http://webapp.com/hr" :
Something went wrong
Technical Details
SharePoint returned the following error: Invalid URI: The URI is empty. Contact your system administrator for help in resolving this problem.
Anybody know what's wrong? Thanks in advance.
Awen

Answer 1

Hi Awen,
According to your description, my understanding is that the error occurred when you accessed the newly created site collection.
From your post, I can see that you created host header for the web application.
I recommend to verify the things below:
Please check the AAM for your web application, make sure the "Internal URL" and  "public URL for Zone" both are your host name URL in Default zone.
Please check the SharePoint site bindings from IIS manager, make sure the host name is the same.
Add the host name and IP in your client hosts file under drivers folder, and make sure you can ping the host name successfully.
Access your SharePoint site collection through your host name in IE browser.
If access denied after login (may 3 times login pop up), you can disable the loopback check, then test again.
http://technet.microsoft.com/en-us/library/cc262366(v=office.15).aspx
http://technet.microsoft.com/en-us/library/cc424952(v=office.15).aspx
Thanks,
Victoria
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Victoria Xia
TechNet Community Support