To set up Red Hat Enterprise Linux Server 5.7 in office network with 802.1x authentication and proxy setting.
Problems & Solution
How to set 802.1x authentication? The 802.1x tab is grey out!
In the System -> Preferences -> More Preferences -> Network Connections, under the Wired tab, add a new connection. You should be able to configure 802.1x tab.
The server cannot connect to the network with 802.1x authentication
To connect to the network with 802.1x authentication enabled, click on the nm-applet icon in the notification bar, and select the network connection created.
But I cannot find the “nm-applet” icon!
By default, the Network Manager service is not running. Start the Network Manager service and you should be able to see the nm-applet icon on the notification bar.
How to set proxy?
You may append the proxy setting to the file /etc/environment. Example of proxy setting are:
export http_proxy='http://my.proxy/' export https_proxy='https://my.proxy/'
“yum update” returns HTTP 400 Bad Request using proxy
It seems that it is a bug in the urlgrabber module. Perform yum update once without proxy to update the package on the server and will solve the problem.
How to lock screen to prevent others seeing my password used in 802.1x connection?
Just press Ctrl+Alt+L. Remember you cannot lock screen if you are using the root account.