Wireless Internet connectivity lost after sleep

I've got a problem where I keep losing my wireless network connection after going to sleep.
The situation is that I'm connecting to my university's secure network. I have the credentials saved on my MacBook. When I need to go and leave my computer on my desk, I go back to the login window, and close the lid. When I come back and open it again, I'm instantly asked for the network password, at the login screen. Regardless of whether I enter it or dismiss the dialog, I'm unable to get a connection automatically after I resume my user session. There's an exclamation mark on the network icon and it says that there's no internet connection on the menu. When I click on this warning, I'm asked to repair the network connection and re-connect to it. This works, but I'd much rather that this be done automatically. Is there no way for me to resume connectivity after waking up my MacBook without having to manually re-connect?
Thanks in advance for any suggestions.

The problem's still happening in 10.6.2. I lose my Internet connection when I go back to the login window, then close the lid on my MacBook so that it goes to sleep. When I awake it, and log back in, I'm shown as being connected to the network, but not to the Internet. I have to manually re-connect.
When I just close the lid without exiting to the login window, it appears that my Internet connection is re-established automatically, though, on re-awakening. I'm puzzled as to why this is occurring. It looks like a bug to me.

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WiFi Internet connection lost after iMac wakes up, what to do ?

Hi,
I used my iMac for a while with an older D-link product and Internet connection was fine. I purchased a new D-link product and whenever my iMac goes to sleep and wakes up again, I lose INternet connection although my airport icon still recognizes the network and says signal is at full strength. Apple Care can't help me.
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Thx&Rgds

To Apple Discussions!
"I purchased a new D-link product"
Have you contacted the manufacturer to determine if the problem is with them?

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Hello everbody,
Each time I send my PowerMac G4 MDD Dual 867 to sleep it won't to connect to my (or rather to any) Airport network anymore after waking up, it just seems as if Airport is completely defunct after waking up.
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+My internet connection dies when going into sleep mode. What can i do to fix this?+
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I upgraded my 24" iMac, 2.16 to a 27" iMac I7. I am now having probles remaining connected to the internet after the machine is idle for a while. I am using a Time Capsule and cable router and have been using the same two devices before the ungrade in my computer. I am also using OpenDNS, again as before. My computer is wired to the TC via ethernet and my wife's computer is wireless. She has no problem. She does not lose connectivity at all on her iMac 24". The drop occurrs time to time after the machine sleeps or sits idle for a while. I know Ive seen various threads about connectivity issues but can't seem to find an answer. Help is appreciated.

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Hello tim290,
After reviewing your post, it sounds like after the computer wakes from sleep it does not connect to the internet. I would recommend that you read this article, it may be able to help the issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity - Apple Support
Symptom: After restarting or waking from sleep, my computer might not connect to the Internet
After waking from sleep or starting up, your computer may not show that it is connected to a Wi-Fi network.
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Solution
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Thanks for using Apple Support Communities.
Have a nice day,
Mario

Wifi connection lost after sleep

Hello guys,
I have a MacBookPro retina 15" and every time my mbp go in sleep mode it lost the wifi connection...
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bye bye,
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Message was edited by: RMT07

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Wireless Internet connectivity lost after sleep

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