Fixed: The controller does not send mDNS queries or responses after upgrade

What's New in Cisco IOS XE 17.15.4b

• There are no new features in this release.

Open Issues for Cisco IOS XE 17.15.4b

• CSCwk79990: Controller encounters kernel unresponsiveness due to IntelResetRequest
• CSCwp14628: Cisco Aironet 3800 APs display client authentication issue after AP Migration to a controller running 17.15.3
• CSCwp20530: Controller does not forward downstream packets to the wireless client after switchover
• CSCwp27215: Cisco Catalyst 9124 AP in Mesh mode encounters poor iperf traffic performance
• CSCwp32113: Controller reloads due to kernel unresponsiveness with segmentation fault (11) in process IGMPSN
• CSCwp61179: Cisco Catalyst 9130 AP fails in port authentication with ClearPass Server
• CSCwp65769: Wave 2 APs performing with fast transition with 802.1X authentication send incorrect M2 message during re-key on session timeout
• CSCwo86312: Controller shows a mismatch between client counts from "show client" commands and SNMP walk totals
• CSCwo92511: Controller has inconsistent default MTU settings for mobility tunnels
• CSCwp07279: Controller unexpectedly reloads due to local software fatal error
• CSCwp39409: Controller reboots unexpectedly due to an assertion failure in WNCd process
• CSCwp93598: Memory leak found in the controller process related to handling a specific database string
• **Resolved Issues for Cisco IOS XE 17.15.4b
• CSCwr09565: The controller does not send mDNS queries or responses after upgrade to 17.12.6 or 17.15.4
• CSCwr15607: mDNS browsing fails for 5 GHz clients when Location LSS is enabled on the controller
• CSCwo98644: RRM does not update the default channel when using IPv6 only on the controller
• CSCwp59171: Users unable to add allowed user on Lobby admin page
• CSCwo89539: Controller reload unexpectedly when adding "location civic-location-id" to multiple interfaces
• CSCwn99763: Noise floor value is always displayed as 0 for a few x-paths
• CSCwo00821: IoT Orchestrator is unable to start after an upgrade or a reload
• CSCwp31397: Controller DFS Radar Detection results in most of the APs allocated to the same channel
• CSCwo62157: Controller with CAPWAP enabled display memory leak in tdl_mac_addr object
• CSCwn39428: Error message "Flow Monitor is Required" is shown even when flow monitor name is available
• CSCwp21187: Controller unexpectedly reboots due to due to mDNS packet
• CSCwo29017: wncmgrd kernel unresponsiveness after issue command ‘show ap config slots’
• CSCwn92827: Secondary controller fails with rsync error
• CSCwo15982: Controller unexpectedly reboots with 17.15.3.14 image
• CSCwo54553: Controller displays traceback messages when default-policy-tag APs block initiates a configuration change for other APs due to Ref-count not zero
• CSCwp16968: 1562 WGB FT Roaming client disconnection issue due to MAC record Mismatch
• CSCwo07767: Controller's active chassis get stuck in active recovery state on 17.12.4
• CSCwn92477: Controller unexpectedly reboots during WNCd process due to assertion failure with invalid BSSID
• CSCwn90855: Controller overrides client's IP address in the device tracking database causing packet loss
• CSCwn94511: The factory-reset all command is unsecure but functions as if it has a secure option
• CSCwo97886: Controller display out of order packet issue with fragmented packet when AutoQOS is enabled
• CSCwo35645: NETCONF over SSH fails to return all the records for wireless-client-oper and shows 'invalid XML' before everything is returned
• CSCwp12959: Wireless client gets excluded with one authentication failure or never gets excluded
• CSCwn11160: Controller running in HA in guest anchor sends traffic to the wrong tunnel after switchover for already connected clients
• CSCwo37680: Controller initiates client deletion with code: CO_CLIENT_DELETE_REASON_DOT11_MAX_STA
• CSCwn96363: Remove redundant counters from "show wireless stats ap name <ap> dot11 5GHz" output
• CSCwo70030: WNCd process rogues even when bssid-neighbor-stats config is disabled
• CSCwn31021: Controller fails to represent the correct format of AP Name and VLAN ID in option 82
• CSCwo19011: Controller observes unexpected SISF reboot with WNCD core
• CSCwp25552: BSSID-mac dispatched as 00:00:00:00:00:00 for slot 1 WLAN 1
• CSCwn33501: Controller connected to the AP does not give any output while executing the #show ap summary sort name command
• CSCwp03988: Unexpected Reload Due to Unsuccessful copy of the MAC address
• CSCwo20395: Controller's rogue classification rules do not apply configured classifications
• CSCwo53638: Client error: High-availability data path setup failed on standby device in RA trace
• CSCwo61286: Audit session ID changes after inter-WNCd roam on Central Web Authentication (CWA) with PSK
• CSCwp26707: Controller fails to start L2 authentication for 11r clients with vlan-persitent configured in 17.12.5
• CSCwp86129: Client connected to local mac-auth PSK or MPSK SSIDs get disconnected and do not remain connected to the controller
• CSCwo98083: Access points are unreachable in inventory on Cisco Connected Cloud version 2.3.7.9
• CSCwo64967: Mobility tunnel with data-link encryption intermittently disconnects when the fourth octet of the WMI address is 255
• CSCwo41248: Controller display wrong message when configuring 2 radios on the same UNII band (100 - 144)
• CSCwo33572: Failed to collect RA tracing logs on Cisco IOS XE Release 17.9.5</ap>