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Clients got disconnected just few seconds after they are connected.

Dear All,

We have a 5508 controller and some 3602I APs. The network has been running long time without problem, but these days some clients got disconnected just few seconds after they are connected on 802.11gn. 802.11an is no problem. The debug message as below, the status has been change to (RUN) and back to (DHCP_REQD) for unknow reason, and then the device is disassociated.

Could you please help me out? Thanks in advance.

*DHCP Socket Task: Nov 13 21:19:38.345: 00:eb:2d:68:5e:f8 Assigning Address 172.16.2.196 to mobile

*DHCP Socket Task: Nov 13 21:19:38.345: 00:eb:2d:68:5e:f8 DHCP success event for client. Clearing dhcp failure count for interface management.

*DHCP Socket Task: Nov 13 21:19:38.345: 00:eb:2d:68:5e:f8 DHCP success event for client. Clearing dhcp failure count for interface management.

*DHCP Socket Task: Nov 13 21:19:38.345: 00:eb:2d:68:5e:f8 DHCP successfully bridged packet to STA

*pemReceiveTask: Nov 13 21:19:38.345: 00:eb:2d:68:5e:f8 Set bi-dir guest tunnel for 00:eb:2d:68:5e:f8 as in Export Foreign role

*pemReceiveTask: Nov 13 21:19:38.346: 00:eb:2d:68:5e:f8 172.16.2.196 Added NPU entry of type 1, dtlFlags 0x4

*pemReceiveTask: Nov 13 21:19:38.346: 00:eb:2d:68:5e:f8 Skip Foreign / Export Foreign Client IP 172.16.2.196 plumbing in FP SCB

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 172.16.2.196 RUN (20) Skipping TMP rule add

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 apfMsRunStateDec

* apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 172.16.2.196 RUN (20) Change state to DHCP_REQD (7) last state RUN (20)

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 apfMmProcessCloseResponse (apf_mm.c:547) Expiring Mobile!

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 apfMsExpireMobileStation (apf_ms.c:5908) Changing state for mobile 00:eb:2d:68:5e:f8 on AP 20:bb:c0:67:a1:00 from Associated to Disassociated

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 apfMsAssoStateDec

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 apfMsExpireMobileStation (apf_ms.c:6040) Changing state for mobile 00:eb:2d:68:5e:f8 on AP 20:bb:c0:67:a1:00 from Disassociated to Idle

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 pemApfDeleteMobileStation2: APF_MS_PEM_WAIT_L2_AUTH_COMPLETE = 0.

*apfReceiveTask: Nov 13 21:19:41.171: 00:eb:2d:68:5e:f8 0.0.0.0 DHCP_REQD (7) Deleted mobile LWAPP rule on AP [20:bb:c0:67:a1:00]

*pemReceiveTask: Nov 13 21:19:41.172: 00:eb:2d:68:5e:f8 0.0.0.0 Removed NPU entry.

*apfReceiveTask: Nov 13 21:19:41.172: 00:eb:2d:68:5e:f8 apfMs1xStateDec

*apfReceiveTask: Nov 13 21:19:41.172: 00:eb:2d:68:5e:f8 Deleting mobile on AP 20:bb:c0:67:a1:00(0)

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