It appears that enabling UFW is causing my network connection to drop periodically on a WPA-Enterprise network, according to the network-manager GUI app (and the lack of a server response to web browsing for a minute or so while it is out). Is this because UFW is preventing something needed for WPA or DHCP when configured with the defaults?
closed as too localized by Luis Alvarado♦ Mar 14 '13 at 17:01
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I'm running 10.04 on a Dell X300 (old) laptop with ufw enabled (through GUFW gui tool : sudo apt-get install gufw, then configure from system/administration/firewall configuration).
We use a non-hidden SSID configured with WPA2 and PEAP authentication. No issues.
UFW is configured as default - deny all incoming, allow all outgoing.
As a result, DHCP should be unaffected since technically it's outbound traffic (a network broadcast to the local subnet), to which the DHCP server responds appropriately.
Like the commenters above, I presume that everything works if you disable UFW (sudo ufw disable)? If so, further investigation required - perhaps a look at /var/log/messages or similar.