Can't connect to internet after upgrading to leopard

Can someone please HELP ME! I have a ibook g4 and I recently upgraded from tiger to Leopard. My wireless internet service worked fine until I upgraded. My computer still recognizes the network i’m trying to connect to but when I try to connect, it either says “connection time out” or “connection failed.” I know it’s not a problem with the network because my husband can connect to the same network on his macbook pro and on a psp. I know the problem has something to do with leopard. If anyone has experienced this or has any possible solutions on how to fix this please help.
Thanks in advance

Kim, I have the same problem since I upgraded to Leopard, on the wireless connection at my office. Everything still works fine at home and on campus, so it seems to have affected some wireless routers and not others.
I am still working to make the connection at work connect without the "connection failed" report, but one thing I've read is to go to your System Preferences, click on Network, select the Airport option, click on Advanced, click on the TCP/IP tab, then Configure IPv6: check to see that it's OFF. Some people have reported that this helps. Hope it does for you.

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Can't connect to internet after upgrading to leopard

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