the Access problem by no-WWW

Question

my problem looks strange. when I enter www.upitr.com in browsers, it works, but for upitr.com, It works just in FireFox and Safari while it doesn't work in IE and Chrome. Any ideas? Thanks

Answer 1

Firefox and Safari might be adding the www automatically if the base address doesn't resolve.

To find out what exactly is going on use Wireshark and filter for DNS traffic. This way you would see exactly which DNS queries are generated and what are the responses.

Answer 2

One can easily test this using nslookup, too:

$ nslookup upitr.com     
Server:     8.8.4.4 
Address:    8.8.4.4#53

Non-authoritative answer:
*** Can't find upitr.com: No answer

$ nslookup www.upitr.com     
Server:     8.8.4.4 
Address:    8.8.4.4#53

Non-authoritative answer:
Name:    www.upitr.com 
Address: 68.71.136.29

And yep, some browsers try adding www. if the main domain doesn't resolve.