Different account user cannot connect to internet, admin account yes

[gabitomar]

My computer shares different users. When logged like Admin user everything with Internet is right. But when another user, with no admin privileges logs in, he is not able to navigate, although Airport with DHCP service seems ok. No other restrictions has this user account (like Parental Controls, ie). Why can occur this? I thought that everything can determine into the Admin account and the normal user cannot change anything important. What I need to check?, restablished or reconfigure?

Please help!!!

MacOS 10.5.6

[trevor]

When logged into the non-admin account, open up a web browser and try to go to both of the following two URLs:
http://macosxhints.com
http://70.42.185.231

If the non-admin user cannot open the first, but CAN open the second, then the problem is DNS. Explicitly enter DNS servers into System Preferences > Network.

Trevor