Everyone - I know this question has been posted by a few others but the fix is specific to a users computer. My issue is happening on more than one mac. So here is the deal:
I work for the local ISP. We have a large wifi network where customers can connect to and get a login screen where they have to enter their information (standard hotspot scenario).
We also have an adsl network which all works on dhcp. The customer receives an adsl wireless modem configured as a router. We have multiple model modems.
Windows OS connects to both networks fine without a problem. Linux OS connects to both networks without a problem as well.
The newer Mac OS 10.7 connects to both networks fine as well however 10.5 as well as 10.6 is having issues connecting to both networks. Whenever connecting to either network with a mac running 10.5 or 10.6 (have not tried previous versions) any mac running this version freezes (colorful ball keeps turning). The only way to get out of this is to hold the power button and shut down. If I turn off the airport so that the mac does not connect to any internet connection it is fine. It freezes on both ethernet and airport connection. Again this does not happen to a specific computer but yet to multiple clients. More and more arising each day. At the moment I have 5 different clients with the same problem.
The one thing I have noticed from troubleshooting is that on our older version modem this does not happen. I am not sure what the difference is in the config of the old and new model modem though as they are both configured the same, only difference being that the wireless security is wpa2 instead of wep however this should not matter as the freezing still happens when using the ethernet connection. I stil have some more testing to do with the modem but this still does not explain why the same is happening on the wifi network. Wifi network is open and authentication is done by a radius server. IP is all dhcp.
Each network wifi and adsl is also on a seperate vlan. Only thing they have in common are the dns servers.
Hope someone can help out with this one. Thanks and let me know if there is additional info required. I will continue to troubleshoot and note my results. Thanks again for any help.