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On several Linux distributions, the NetworkManager daemon provides user-configurable control of network connections. In KDE, the KNetworkManager (KDE3 and KDE4) and Network Management (KDE4) are the main user interfaces to NetworkManager.
To report a useful bug against Network Management, provide the following items of information:
And very importantly: Are you able to connect with another client? For example, nm-applet under GNOME or cnetworkmanager on the console. If so, please try to attach comparative troubleshooting information as described at the end of this article.
Network Management on most Linux desktops sits on top of a large and fragile stack of components. This is necessary to deal with the vast number of different configurations. When a connection fails, it can be for any one of a number of reasons throughout this stack, but the symptoms will usually be something like "Connection got to 28% and then failed". Bugs reported at bugs.kde.org will be triaged to try and find out at what layer the failure occurred, so that it can be fixed by those responsible.
Wireless hardware has a surprising number of bugs. These are dealt with at the next layer, if you are lucky.
This is where the actual driver that controls the hardware is located. There are many interesting bugs here too. Since the introduction of a standard wireless MAC layer in the Linux kernel, this situation is improving. Some hardware doesn't have a Linux driver, so people control it using the ndiswrapper tool, which loads Windows drivers and their bugs. You can see its output in the system log, and talk to the drivers using the iwtools set of commands.
wpa_supplicant is a low level tool for talking to the driver, providing authentication and encryption settings. It is open source and generally of high quality. Before the advent of NetworkManager, users had to configure it manually with control files in /etc. This has been known to get people out of a tight spot occasionally. It usually logs to /var/log/wpa_supplicant.log. Nowadays it is mostly controlled remotely by....
NetworkManager is the system daemon at the centre of the networking subsystem on most end user Linux installations. It has root privileges, needed to control the lower layers, and exposes some controls up to clients running in the user session via DBUS. It writes a log in /var/log. NM also controls DHCP clients as needed and rewrites /etc/resolv.conf with the DNS servers it has configured. NetworkManager also provides a SystemSettings service, which is responsible for reading your distribution's network configuration files (system wide) and feeding them into NetworkManager.
KNetworkManager applet for KDE 4, Network Management Plasmoid under KDE 4, KNetworkManager under KDE 3, nm-applet under GNOME, and cnetworkmanager is your last life. These are responsible for
While they are the most visible part of the system, they are also the least important to making a successful connection. Since they share a standard interface to NetworkManager, they can be exchanged easily.
Simple. Start at the top of the stack and work down. When you find something that works, you found the site of the problem. When you run out of things you can change, hand over to an expert (probably the responsible team at your Linux distribution).
If you are reading this, you will have been able to make a connection using a different NetworkManager client.
First, make sure that you are not running another client as well as Network Management. This will lead to unpredictable results. If you were, remove and restart Network Management. You can run it externally to Plasma asplasmoidviewer networkmanagementif you want.
You should now try to figure out how the connection provided by Network Management differs from that provided by the other client. If you build Network Management from source you can use the tool 'qdbusfornm', which is a version of qdbus extended to handle NM's data types.
If you do not build from source, just replace./qdbusfornm --systemby
qdbus --system --literalin the command shown below. It is a bit harder to read but should give you the same output. If you use
qdbus --system --literalplease take the time to format the output so there is one key per line, similar to the qdbusfornm output below. This is easy and just takes time, so it is better for you to do this than a developer.
The value 0 below identifies the connection. Change it if you have more than one until you find the relevant connection.
./qdbusfornm --system org.freedesktop.NetworkManagerUserSettings /org/freedesktop/NetworkManagerSettings/0 org.freedesktop.NetworkManagerSettings.Connection.GetSettings
returns here
KDE UserBase Wiki 
• a{sa{sv}}(==802-11-wireless==
band: bg
mode: infrastructure
security: 802-11-wireless-security
ssid: opensuse-guest
==802-11-wireless-security==
auth-alg: open
key-mgmt: wpa-psk
wep-tx-keyidx: 0
==connection==
autoconnect: true
id: openSUSE
type: 802-11-wireless
uuid: {951cc7d9-1fa0-4525-9ab7-7199849e1b19}
==ipv4==
dns-search:
method: auto
)
Now you should repeat using the other, working client and copy both sets of output, before attaching them securely to a bug report at bugs.kde.org. With this information we will quickly be able to implement a fix.
If you have a crash ensure you install debugging symbols and take a backtrace. In Kubuntu you need to add the debug repository and install plasma-widget-networkmanagement-dbgsym.
