Error connected eWc controller

[gtstech]

I encountered this log error and was unable to log into EWC via WebUI even though the password was correct.

[*01/19/2026 09:58:34.2490] Warning, unencrypted data keepalive failed [*01/19/2026 09:58:34.2490] [*01/19/2026 09:58:34.2490] Going to restart CAPWAP (reason : data keepalive not received)... [*01/19/2026 09:58:34.2490] [*01/19/2026 09:58:34.2490] Restarting CAPWAP State Machine. [*01/19/2026 09:58:34.2730] Flexconnect Switching to Standalone Mode! [*01/19/2026 09:58:34.3730] [*01/19/2026 09:58:34.3730] CAPWAP State: DTLS Teardown [*01/19/2026 09:58:34.5370] status 'upgrade.sh: Script called with args:[CANCEL]' [*01/19/2026 09:58:34.5830] do CANCEL, part2 is active part [*01/19/2026 09:58:34.6160] status 'upgrade.sh: Cleanup tmp files ...' [*01/19/2026 09:58:34.6440] The size of /tmp/ntevents is less than 50KB. No cleanup needed. [*01/19/2026 09:58:34.6450] Dropping dtls packet since session is not established. Peer 192.168.40.10-5246, Local 192.168.40.68-5258, conn (nil) [*01/19/2026 09:58:39.2940] dtls_queue_first: Nothing to extract! [*01/19/2026 09:58:39.2940] [*01/19/2026 09:58:39.4240] Discovery Response from 192.168.40.10 [*01/19/2026 09:58:39.4250] Discovery Response from 192.168.40.10 [*01/19/2026 09:58:39.4710] Discovery Response from 192.168.40.10 "

[Cristian Matei]

Hi,

   For the log messages you're seeing, you could hit the bug, even though the bug refers to a different platform, so ensure to use a recommended SW version:

https://bst.cisco.com/bugsearch/bug/CSCvf26136?rfs=qvlogin

   AS for not being able to access the GUI, check this guide's section "GUI is not Accessible":

https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/222745-troubleshoot-embedded-wireless-controlle.html#toc-hId--148038214

Thanks,

Cristian.

[Mark Elsen]

  - @gtstech       What error do you get in the browser when trying to use the WebUI  ?

  M.