After the first reboot in KDE 4.5.1 the network manager plasmoid stopped to work well by showing a red icon (typical error icon) with a message that says that there aren’t network interfaces. The issue is that my network is working just fine. All net interfaces are up and running well. In fact nm connected to my favorite set connection but the plasmoid doesn’t work well.
The plasmoid-networkmanagement replaces the older knetworkmanager that we remember from earlier versions of KDE.
It also provides more information about your connection.
I would also recommend checking Yast → Network Devices → Network Settings.
Thanks Romanator. In fact the idea is to try an alternative to knetworkm so I’ll give this plasmoid a few more weeks otherwise I’ll bring knetm back again.