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pardon me for asking a very basic doubt.
I have hosted a page in the site
collinfo.annauniv.edu
The page opens fine when i enter the address as
http://collinfo.annauniv.edu
But when i gave
www.collinfo.annauniv.edu
my browser shows 404 error.
What is the difference that http causes here in place of www.
The www. before your domain is actually a subdomain. It’s essentially the same thing as help.microsoft.com or orders.amazon.com.
With that in mind, there are a few things that could be happening:
1) Your DNS records do not include the appropriate A Record for the www subdomain.
In this case, you’ll need to setup an A record that points to your web site’s IP address. If you don’t know how to do this, your web host should be able to help.
2) Your server is not configured to handle the www subdomain.
If you’re using the apache web server, it needs to be configured to show your web site when the user enters www before your domain. Again, your web host can set this up for you.
It all comes down to a misconfiguration issue. If you don’t have experience administering web servers, you may want to give your web host a holler.