Security Authentication Windows 7 Professional

[Ustadh]

Hi Guys,

I have a three HP Laptop Probook 6450b 3.0GHZ Genuine Intel processor i3/2GBRAM/350GBHDD.
It's running Windows 7 professional 32-bit.

I did join them to our domain and am able to access all network resources.My challenge however comes in when i try to access internet on either of the Laptops.I keep on getting an Authentication window requiring me to put my username and password for all the sites that i try to access.Even if i put in the correct username and password,the window won't disappear.I am using a domain account that has internet access permissions.I am able to access internet on Windows XP machine using the same account.

Any ideas on what could be causing this?I will really appreciate your help with this.
Thank you.

[INDRANIL]

Just check out the DC first. Is it IIS 7 ?? Make sure Client computers and Web servers are in the same domain. Default authentication protocol is Kerberos now change to windows authentication (includes NTLM & Kerberos) and see. One more thing Kerberos v5 requires a connection to Active Directory.

[Ustadh]

Thanks aheap for your response.Let me check and revert.