Seems this is sporadic and I ran the updated Perl script from command line I just get version is up to date with no errors in the log
06/10/19 16:00:03 updater[3881] can’t connect to CWAF server
06/10/19 16:00:03 updater[3881] lwp_params: timeout=60 sec, save_to_file flag: 1
06/10/19 16:00:03 updater[3881] HTTP response code: 503
06/10/19 16:00:03 updater[3881] Error reason: Service Unavailable
06/10/19 16:00:03 updater[3881] ERROR: can’t connect to CWAF rules server
06/10/19 16:00:03 updater[3881] update process finished!
06/10/19 16:09:43 updater[6706] debug is ON, level = 10
06/10/19 16:09:43 updater[6706] create pid file
06/10/19 16:09:43 updater[6706] try to get data from CWAF server
06/10/19 16:09:43 updater[6706] lwp_params: timeout=60 sec, save_to_file flag: 0
06/10/19 16:09:44 updater[6706] normalize content
06/10/19 16:09:44 updater[6706] parse JSON from CWAF server
06/10/19 16:09:44 updater[6706] got answer from CWAF (OK)
06/10/19 16:09:44 updater[6706] save response
06/10/19 16:09:44 updater[6706] lwp_params: timeout=60 sec, save_to_file flag: 1
06/10/19 16:09:44 updater[6706] current version is up to date
06/10/19 16:09:44 updater[6706] update process finished!
06/10/19 16:09:56 update-client[6768] debug is ON, level = 10
06/10/19 16:09:56 update-client[6768] create pid file
06/10/19 16:09:56 update-client[6768] Downloading file url=https://waf.comodo.com/doc/version.dat, save to file: /var/cpanel/cwaf/tmp/remote.dat
06/10/19 16:09:56 update-client[6768] local client version = 2.24.4
06/10/19 16:09:56 update-client[6768] remote client version = 2.24.4
06/10/19 16:09:56 update-client[6768] current version is up to date
06/10/19 16:09:56 update-client[6768] update process finished!
06/10/19 16:10:02 updater[6837] debug is ON, level = 10
06/10/19 16:10:02 updater[6837] create pid file
06/10/19 16:10:02 updater[6837] try to get data from CWAF server
06/10/19 16:10:02 updater[6837] lwp_params: timeout=60 sec, save_to_file flag: 0
06/10/19 16:10:03 updater[6837] normalize content
06/10/19 16:10:03 updater[6837] parse JSON from CWAF server
06/10/19 16:10:03 updater[6837] got answer from CWAF (OK)
06/10/19 16:10:03 updater[6837] save response
06/10/19 16:10:03 updater[6837] lwp_params: timeout=60 sec, save_to_file flag: 1
06/10/19 16:10:04 updater[6837] current version is up to date
06/10/19 16:10:04 updater[6837] update process finished!