Connecting to Closed Networks

I have an airport express that I use for wireless access in my dorm. So, it's acting as a traditional router rather than a range extender. I have it set up as a closed network so that it's only visible to those who know the network name. I also have WPA2 enabled for security.
My problem is that, rather sporadically, I will wake my MBP from sleep and a dialog appears stating that "No known networks are available" and gives a list of available open networks. So, I choose "other" and input the network name and the password, making certain that "remember this network" is checked before connecting. Even after doing this multiple times, I still get the dialog periodically (about every other day or so) and I haven't been able to figure out why.
I left the network open for about a week and didn't encounter this issue, so it seems to be associated with the fact that it is a closed network. It wouldn't be a huge deal to have the network visible to anyone who browses for a network since it is encrypted, but I would rather have it closed in a building with a lot of people.
Does anyone have any ideas for a solution?

Yeah, the debate goes on and on, but if you were running aircrack-ng or kisMac and you saw my non-broadcast SSID pop up because I was actively affiliated to my network, wouldn't that pique your interest more in my network than in Alex's whose WPA2-AES-secured SSID you saw every day?
Meanwhile, I don't really know of any fix to Alex's complaint, in order to avoid the hoops that he has to jump through in order to reaffiliate after waking from sleep -- I can't say that I can recall ever seeing anything posted in these forums that adequately addressed the issue. Nobody's piped in on this thread yet with a suggestion to fix this behavior. I'd love to hear of one that is a dependable long-term fix. I'd go non-broadcast then myself.
I used to not broadcast a long time ago when I first went wireless, but I got tired of dealing with this very issue all the time myself, so when I weighed the annoyance of the reaffiliation process after waking from sleep versus the increased likelihood of my WPA2-AES-PSK with truly random passcode getting cracked because I broadcast my SSID, I chose convenience over annoyance. I don't believe that my security has been compromised in any way by my choice.
Alex is apparently annoyed as well, so that's why I recommended he go ahead and broadcast SSID so as to not be annoyed by this behavior anymore. WPA2-AES with a random passcode is as secure as he's gonna get wirelessly, broadcast SSID or not. He needs to weigh the choice of putting up with the annoyance factor or not...until somebody posts a sure-fire cure.

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Duane,
I am aware that not broadcasting the SSID provides little in the way of protection. I do it to prevent casual snooping. I use WPA encyrption on the network. Actually the SSID is not broadcast continuously between base station and clients. It is always sent in the authentication frame and sometimes in other association frames. Tools like AirJack can send spoof deauthentication frames, force reauthentication, and thereby reveal the SSID.
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I chose to keep my network closed by configuring my Airport Extreme to not broadcast it's network name. Laptops have no trouble remember the settings for my closed network after just one configuration. I just got my new iPhone connected to my Airport Extreme, but it seems to lose or forget the settings after it automatically locks. I then have to reconfigure the Wi-Fi settings of the iPhone to reconnect to my wireless network.
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Many thanks for your reply . I want to send an emal with an attachment I use the SMTP Email send file.vi . But when I run it ,it always have mistake.I will show you my program and the mistake.The mistake 1 is on the windows 2k . The mistake 2 is on the mistake windows xp
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Best solution - don't enable the "create a closed network" feature on the Base Station. It is useless as a security method anyway, since any amateur wireless network hacker will have absolutely no problem sniffing out your so-called "closed network" using software readily available on the internet.

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Hello Sio
Believe me it is not easy to say why this happen exactly because the LAN configuration of your unit is not known to us. First of all you should discuss it with your network administrator. He is the person who knows how it works in your company.
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I have all the latest updates for my Macbook Pro, but I've noticed that whenever I restart the computer, it can't connect to my network at school. It's a hidden network, but I have it in my preferred list, so it ought to be able to find it. When I just put the computer to sleep, it can find it when it wakes back up, but if I shut it down or restart it, I have to either select "Other" from the Airport list and re-enter all the information or go to the network options and just enter the password for it again (for some reason it doesn't want to save the passwords for my networks). This happened to me at home when I had that network set up as hidden, so I eventually changed it to open so that I didn't have to deal with it all the time. Is there a step I'm missing somewhere?

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I have been trying to connect to the Network in the lab. Predominately filled with Windows users, no one knows the slightest bit about how to connect a Mac, it uses WPA Authentication with TKIP encryption. I have a username and password but when trying to connect with WPA Enterprise it says the network does not recognize that kind of encryption. Does anyone know how to fix this problem. The windows instructions for setting up a wireless network are at:
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Can you clarify what you mean by "closed network"? Normally a "closed" network is one in which the name of the wireless network is not visible.
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goldengti, Welcome to the discussion area!
Is the multicast rate the same as the TX rate on other routers?
Sorry I don't know about other routers. The multicast rate defines the minimum data rate the base station will use and maintain the wireless connection. If you set it to 11 Mbps, the wireless connection will be broken if that data rate can't be maintained.
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Connecting to Closed Networks

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