NTP Sync Failure | Server Unreachable | Can Ping | DNS Resolving..

[TryllZ]

Hi,

I'm facing this issue where the NTP does not sync, NTP is the firewall interface which can be pinged by the vCenter and DNS resolves fine as well. The below is what I got from the logs but it only says Server Unreachable, nothing else.

2020-12-30T14:04:55.308 [2449]DEBUG:vmware.appliance.timesync.impl:com.vmware.appliance.timesync.get()
2020-12-30T14:04:55.308 [2449]DEBUG:vmware.appliance.timesync.impl:Executing operation /sbin/service ['ntpd', 'status']

2020-12-30T14:04:55.346 [2449]DEBUG:vmware.appliance.timesync.impl:Operation output = b'\xe2\x97\x8f ntpd.service - Network Time Service\n Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: enabled)\n Active: active (running) since Wed 2020-12-30 13:40:05 UTC; 24min ago\n Docs: man:ntpd\n Main PID: 1384 (ntpd)\n Tasks: 2\n Memory: 1.3M\n CPU: 180ms\n CGroup: /system.slice/ntpd.service\n \xe2\x94\x94\xe2\x94\x801384 /usr/bin/ntpd -g -u ntp:ntp\n\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: restrict default: KOD does nothing without LIMITED.\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: Listen and drop on 0 v6wildcard [::]:123\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: Listen and drop on 1 v4wildcard 0.0.0.0:123\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: Listen normally on 2 lo 127.0.0.1:123\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: Listen normally on 3 eth0 192.168.31.133:123\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: Listening on routing socket on fd #20 for interface updates\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized\nDec 30 13:40:05 vCSAP.vlab.lab ntpd[1384]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized\nDec 30 13:48:47 vCSAP.vlab.lab ntpd[1384]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized\nDec 30 07:49:13 vCSAP.vlab.lab ntpd[1384]: frequency error -66179369 PPM exceeds tolerance 500 PPM\n', error = b'' returncode = 0
2020-12-30T14:04:55.346 [2449]DEBUG:vmware.appliance.timesync.impl:NTP status Up
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2020-12-30T14:04:55.385 [2449]DEBUG:vmware.appliance.timesync.impl:com.vmware.appliance.ntp.get()
2020-12-30T14:04:55.418 [2449]DEBUG:vmware.vherd.transport.vapi:State 'UP_TO_DATE'
2020-12-30T14:04:55.418 [2449]DEBUG:vmware.appliance.timesync.impl:com.vmware.appliance.ntp.test(['192.168.31.146'])
2020-12-30T14:04:55.418 [2449]DEBUG:vmware.appliance.timesync.ntpTestUtils:Testing connection to: ['192.168.31.146']
2020-12-30T14:04:55.543 [2449]DEBUG:vmware.appliance.timesync.ntpTestUtils:NTP test out: b'server 192.168.31.146, stratum 12, offset -21574.474246, delay 0.02652\n', err: b'30 Dec 14:04:55 ntpdate[13883]: no server suitable for synchronization found\n', returncode: 1
2020-12-30T14:04:55.545 [2449]DEBUG:root:TestRunStatuses: servers=['192.168.31.146']
statuses=['SERVER_UNREACHABLE']
messages=[Structure('LocalizableMessage', dict(id='com.vmware.appliance.ntp_sync.failure', args=[], defaultMessage='Unable to sync to NTP server.'))]
2020-12-30T14:04:55.557 [2449]INFO:twisted:"127.0.0.1" - - [30/Dec/2020:14:04:54 +0000] "POST /rest/appliance/ntp/test HTTP/1.0" 200 186 "https://vcsap.vlab.lab:5480/ui/time" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36 Edg/87.0.664.47"
2020-12-30T14:04:58.703 [2449]INFO:vmware.vherd.transport.ssh_access_collector:Feature switch: VCSA_SSH_ACCESS_EVENT disabled.
2020-12-30T14:04:58.893 [2449]INFO:vmware.appliance.vapi.auth:Authorization request for service_id: com.vmware.appliance.ntp, operation_id: test
2020-12-30T14:04:58.893 [2449]DEBUG:vmware.appliance.extensions.authorization.authorization_sso:Required privileges = ['ModifyConfiguration']
*** *** *** *** *** *** *** *** *** *** *** ***
2020-12-30T14:04:58.914 [2449]DEBUG:vmware.vherd.transport.vapi:State 'UP_TO_DATE'
2020-12-30T14:04:58.914 [2449]DEBUG:vmware.appliance.timesync.impl:com.vmware.appliance.ntp.test(['192.168.31.146'])
2020-12-30T14:04:58.914 [2449]DEBUG:vmware.appliance.timesync.ntpTestUtils:Testing connection to: ['192.168.31.146']
2020-12-30T14:04:59.41 [2449]DEBUG:vmware.appliance.timesync.ntpTestUtils:NTP test out: b'server 192.168.31.146, stratum 12, offset -21574.474228, delay 0.02660\n', err: b'30 Dec 14:04:59 ntpdate[13903]: no server suitable for synchronization found\n', returncode: 1
2020-12-30T14:04:59.44 [2449]DEBUG:root:TestRunStatuses: servers=['192.168.31.146']
statuses=['SERVER_UNREACHABLE']
messages=[Structure('LocalizableMessage', dict(id='com.vmware.appliance.ntp_sync.failure', args=[], defaultMessage='Unable to sync to NTP server.'))]
*** *** *** *** *** *** *** *** *** *** *** ***
2020-12-30T14:05:03.703 [2449]INFO:vmware.vherd.transport.ssh_access_collector:Feature switch: VCSA_SSH_ACCESS_EVENT disabled.
2020-12-30T14:05:08.704 [2449]INFO:vmware.vherd.transport.ssh_access_collector:Feature switch: VCSA_SSH_ACCESS_EVENT disabled.
2020-12-30T14:05:13.704 [2449]INFO:vmware.vherd.transport.ssh_access_collector:Feature switch: VCSA_SSH_ACCESS_EVENT disabled.
2020-12-30T14:05:18.707 [2449]INFO:vmware.vherd.transport.ssh_access_collector:Feature switch: VCSA_SSH_ACCESS_EVENT disabled.
2020-12-30T14:05:23.705 [2449]INFO:vmware.vherd.transport.ssh_access_collector:Feature switch: VCSA_SSH_ACCESS_EVENT disabled.

Any way to get this working as I believe this is what is causing failure to join Active Directory domain as well.

Nothing being blocked in firewall either.

Thank You