Ubuntu 8.04 on a particular network, connects to NETGEAR WPN802v2 access point. Does not get to internet. Same computer setup accesses all other
NETGEAR open and secure networks and connects to internet on those for which pass phrase is not needed or is known. All Windows computers
automatically connect through the stubborn access point effortlessly.
I have tried several tutorials, forums, ideas over the past week to
solve the problem. Checked "search" and in 2004,5,and 7, several folk
had the same problem...but no solutions that I found. Can try new things
only at the particular network (which I attend frequently), am sending
this from my own secure network.
Does anyone have some viable ideas why this computer won't connect through the open access point to the internet?

You may want to try configuring a static IP on your wlan0 interface on your Ubuntu laptop within the same IP range your Access Pointer/router is handing out. In Ubuntu, I believe you can choose to manually configure your wireless connection. Double check and make sure you don't have your Access point/Router set to block MAC addresses or to only allow certain MAC addresses.

Thanks for the response Linuxguy1. I have tried static IP to no avail.
Checking MAC address properties probably would not reveal anything good
as the access point is a public library which has the service for people with laptops to be able to access the internet while researching genealogy or doing their homework or similar tasks. I do appreciate the
thought though and thanks again for the response.

If you do an iwconfig does it show the SSID/signal strength/etc..you are joined to the wireless network? Try as root: killall NetworkManager
Then: iwconfig wlan0 essid <SSID>
Then: dhclient wlan0
Anything?

as you can see, these two networks are nearly the same. Both have power,
signal levels, and the network manager shows in task bar that both are
connected to their respective networks.
Killall does kill all. Cannot use wlan0 because there is no such device.
Instead, the NIC is called eth1. When that is used and dhclient is sent,
the result is no DHCP offers.
Thanks again for the help.

home unsecured mode
eth1 IEEE 802.11b ESSID:"default" Nickname:"ipw2100"
Mode:Managed Frequency:2.437 GHz Access Point: 00:01:95:6A:52:AF
Bit Rate=11 Mb/s Tx-Power:16 dBm
Retry short limit:7 RTS thrff Fragment thrff
Encryption keyff
Power Managementff
Link Quality=100/100 Signal level=-39 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

library
jim@Bravo:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

irda0 no wireless extensions.

eth1 IEEE 802.11b ESSID:"gclibrary" Nickname:"ipw2100"
Mode:Managed Frequency:2.437 GHz Access Point: 00:12:17:7A:63:F9
Bit Rate=2 Mb/s Tx-Power:16 dBm
Retry short limit:7 RTS thrff Fragment thrff
Power Managementff
Link Quality=76/100 Signal level=-79 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:1 Invalid misc:2 Missed beacon:4