Summary of issue: You cannot connect to a wireless network with a hidden ssid, while using knetworkmanager. This leaves you with the choice of using ifup, yast which uses ifup but provides a gui for new users, etc. But thanks to glistwan helpful post there is a simple way to fix this issue, while continuing to use knetworkmanager.

http://forums.opensuse.org/english/get-technical-help-here/wireless/452093-hidden-ssid-wifi-11-3-kde-networkmanager.html#post2272375

Step 1 Get the wireless name of the hidden network, for example we will be looking for "Tree".

Tree is not on the list of course

Step 2 Open the Terminal and enter super user mode.

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Lin@Lin1:~> [B]su[/B]
Password:
Lin # iwlist eth1 scanning essid Tree


You should get something like this back

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Lin # iwlist eth1 scanning essid Tree
eth1      Scan completed :
          Cell 01 - Address: 00:1D:7E:31:17:29
                    ESSID:"Tree"
                    Mode:Managed
                    Frequency=2.437 GHz (Channel 6)
                    Quality:5/5  Signal level:-19 dBm  Noise level:-94 dBm
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (1) : TKIP
                        Authentication Suites (1) : PSK
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s

Lin #


If you get something like this back check your capitalization, spelling, etc. Only an exact match of the name(SSID) will work.

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Lin # iwlist eth1 scanning essid [COLOR="darkred"]t[/COLOR]ree
eth1      No scan results

Step Three open knetworkmanager click "connect to other network", you should now see your hidden network.


After running these steps once you should continue to see and connect to the hidden network.



Routers tested so far:
Linksys wrt-350n
Cisco 800
wrt-54g

If this post works for you please reply and if possible include your OS version number, 32/64bit, Wireless router test, etc.