Apple iOS Clients: 'Unable to join the network'
Most Apple iOS devices have issues moving from one wlan to another on the same Cisco WLC with the default ‘fast ssid change' configuration disabled.ios
The setting causes the controller to deauthenticate the client from the existing wlan once the client attempts to associate to another.app
The typical result is an ‘unable to join the network’ message on the iOS device:less
The following is a demonstration of an Ipad Mini attempting to move between WLC wlans ‘apple1’ and ‘apple2’.ide
The first test is with fast ssid change disabled, which causes the connection problem, then the second with fast ssid change enabled in which the client is able to successfully move from one wlan to another.spa
WLC client debugs and ipad console logs are documented for both tests.debug
1) Fast SSID Change Disabled (default WLC value)
(jk-2504-116) >show wlan summaryorm
Number of WLANs.................................. 2ip
WLAN ID WLAN Profile Name / SSID Status Interface Nameci
------- ------------------------------------- -------- --------------------rem
1 apple1 / apple1 Enabled management
2 apple2 / apple2 Enabled management
(jk-2504-116) >show network summary
<snip>
Fast SSID Change ........................... Disabled
The Ipad is initially authenticated to apple1:
(jk-2504-116) >show client summary
Number of Clients................................ 1
RLAN/
MAC Address AP Name Slot Status WLAN Auth Protocol Port Wired PMIPV6 Role
----------------- ----------------- ---- ------------- ----- ---- ---------------- ---- ----- ------ ----------------
1c:e6:2b:cd:da:9d 1131-17 1 Associated 1 Yes 802.11a 1 N/A No Local
With fast ssid change disabled, the ipad user will attempt to connect to wlan 'apple2'. It will fail to associate to ‘apple2’ and revert to ‘apple1’.
Solution:
2) Fast SSID Change Enabled
With fast ssid change enabled, the ipad user will successfully connect to wlan 'apple2'.
(jk-2504-116) >config network fast-ssid-change enable
<snip>
Fast SSID Change ........................... Enabled
(jk-2504-116) >show client summary
Number of Clients................................ 1
RLAN/
MAC Address AP Name Slot Status WLAN Auth Protocol Port Wired PMIPV6 Role
----------------- ----------------- ---- ------------- ----- ---- ---------------- ---- ----- ------ ----------------
1c:e6:2b:cd:da:9d 1131-17 1 Associated 1 Yes 802.11a 1 N/A No Local
(jk-2504-116) >show debug
MAC Addr 1.................................. 1C:E6:2B:CD:DA:9D
Debug Flags Enabled:
dhcp packet enabled.
dot11 mobile enabled.
dot11 state enabled
dot1x events enabled.
dot1x states enabled.
FlexConnect ft enabled.
pem events enabled.
pem state enabled.
CCKM client debug enabled.
From: https://supportforums.cisco.com/t5/wireless-mobility-documents/apple-ios-clients-unable-to-join-the-network-fast-ssid-change/ta-p/3142395