Exclamation Mark on wireless icon

Hi,
I have a MacBook 5,2 Intel Core 2 Duo 2.13 Ghz 2GB Memory running snow leopard. I connect to my personal wireless at home and a wireless at my university campus (set-up on campus).
Since my upgrade to snow leopard I have had no issues at home however on campus the wireless icon shows an exclamation mark with a message on the drop down menu "alert: no internet connection". this happens on my university campus only (at least so far). The strange thing is the internet is working and I can browse/download etc. I have contacted the IT department on campus and they have said the issue has only started with people with snow leopard and have no idea. To clarify, the internet is working but I am being told it is not (on campus only, not the case at home). It is not a huge issue as I can access the internet but the exclamation mark is driving me crazy and cannot find a solution.
Any ideas? anyone else encountered this issue? Thanks for your help!

We too have similar problems. I have an older macbook with leopard and it's fine - but a new MBPro with snow leopard has all these problems.
I was prompted to respond here in particular because when we tried to wirelessly connect the MBPro to my home router (it worked for about 30 seconds initially - internet connection as well, but then died) it not only doesn't work (and shows the exclamation mark) but it hangs the router - ie: the old macbook loses connection as well. The only fix here is to restart the router.
This result is completely repeatable. Now (because we successfully connected for a few seconds with the correct wep password) all we have to do is open the lid of the MBPro and my old trusty macbook stops working as well!! (I can't ping the router at this stage either) Power cycle router and comes good again (having turned off airport on the MBPro).
Now, at a different location our BT broadband has gone pear-shaped (almost brand new homehub looks as if it might have died) one wonders if the MBPro is suspect again..
I do hope an OS update will fix this annoyance.

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