Can connect at home but not at school

My macbook pro has no problem connecting to my airport extreme at home and to a netgear router at my mom's house, but when I go to school I can't connect to the wireless internet there. It shows the network as available and asks me if I want to join it as soon as I turn my computer on. I click yes and after about a minute I get a message saying it was unable to connect to the wireless internet. One of my teachers has the exact same MBP and connected his computer sitting right next to mine. I tried checking the internet settings compared to his and the only difference was that he was getting an ip address and I am not. Users are supposed to connect then start their browser and are re-directed to Trapeze to enter a login and password. I open safari and firefox and am never re-directed to this site. We tried putting in the server address and that did not connect either. Please help! I already get a load of crap from everyone there for loving macs and they are teasing me every week about not being able to connect to the internet!
17" MacBook Pro 2.33 Ghz Intel Core 2 Duo Mac OS X (10.4.9)

I think this may be a trapeze bug, I support a wireless network at a university that sounds very similair to the one you're describing. Over the last few weeks we've seen several user with new mbp's having the exact same issue, they see the network but after thinking about joining it for a few minutes they simply state that there is a problem witht the network and refuse to join it. These macs will join home networks without problems it is just our trapeze wirless network they are struggling with.
Of course telindus say it's apples problem and apple say it's telindus's so we're not making much progress (I've resorted to reading the user forums on a friday night). Would be nice to know if any one stumbles on a fix.

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iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
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~~~~~~~~~~~~~~~
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Perhaps the domain names are not resolving properly. Instead of http://lenovo.com, try http://64.26.254.19, which is the numerical address for lenovo.com. If you see the Lenovo home page, it will point us in the right direction.
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I will try that when I get home from work, thank you for the advice. However,I did notice that when it attempts to connect it shows the IP Address in the IE window bottom left corner. In the past it would always read connecting to "website name" but since the problem started it shows the IP address instead of the actual name.

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Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
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If none of the above suggestions work, look at this link.
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
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https://discussions.apple.com/thread/4010130?tstart=60
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

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iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
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https://discussions.apple.com/thread/4010130?tstart=60
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

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Hi and welcome to the Apple Discussions.
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I can connect to my neighbor's unprotected wireless network and have no problem getting on the internet with that connection.
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UPnP allows the apps to open the ports they need when they need them.
Port Forwarding opens the ports you specify and points them to an IP (you need to specify this as well) so that you need to tell the device which ports iChat uses and which IP your computer is on your LAN
Port Forwarding can only open a port to one IP (computer), so say for iChat Text port 5190 can be opened to your computer and no other.
The set up is normally table based and several ports needs by one app can be set.
This means that on a LAN only one computer could then use iChat.
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It is late here as well.
10:33 PM Sunday; June 15, 2008

Can connect at home but not at school

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