ntp on Samba 4 DC not syncing with Windows 10 workstations
by mfoley from LinuxQuestions.org on (#5AMBB)
Ever since upgrading from Windows 7 to Windows 10 the Window 10 workstations no longer sync time with the Domain Controller via ntp. In reviewing the Samba wiki https://wiki.samba.org/index.php/Tim..._Domain_Member, I found one problem was that the default Slackware 4.2 installation of ntpd does not have signed ntp support (--enable-ntp-signd), which is a requirement of DC time synchronization. I downloaded the sources from ntp.org and compiled with --enable-ntp-signd; and I verified the new ntpd does have that enabled.
However, still not syncing. Below is my 'tcpdump udp port 123' monitoring time sync requests:
Code:22:25:37.691172 IP webserver.hprs.local.ntp > mail.hprs.local.ntp: NTPv4, Client, length 48
22:25:37.691260 IP mail.hprs.local.ntp > webserver.hprs.local.ntp: NTPv4, Server, length 48
22:28:32.273708 IP dbvmhost.hprs.local.ntp > mail.hprs.local.ntp: NTPv4, Client, length 48
22:28:32.273877 IP mail.hprs.local.ntp > dbvmhost.hprs.local.ntp: NTPv4, Server, length 48
22:33:09.294234 IP dbserverx.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:34:40.280509 IP 192.168.0.60.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:34:59.909542 IP OHPRSstorage.hprs.local.ntp > mail.hprs.local.ntp: NTPv4, Client, length 48
22:34:59.909630 IP mail.hprs.local.ntp > OHPRSstorage.hprs.local.ntp: NTPv4, Server, length 48
22:35:17.944296 IP DORIS.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:35:41.383775 IP RENEE.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:06.678297 IP 192.168.0.62.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:33.358927 IP 192.168.0.52.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:45.382615 IP 192.168.0.56.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:48.284387 IP 192.168.0.60.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:57.894040 IP carl.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68hosts webserver, OHPRSstorage, and dbvmhost are Linux computers. You will notice there is a query to mail.hprs.local (the DC time server), and a reply back for these hosts. The other hosts, DORIS, RENEE, 0.62, 0.57, 0.53, 0.56, 0.60, are Windows 10 computers. They send a query to mail.hprs.local, but no reply back.
I notice that the Linux hosts's query is NTPv4 and the Windows hosts query is NTPv3. Could that be it? If so, how would I change that?
I've been working on this for months with no joy.
Ideas?
However, still not syncing. Below is my 'tcpdump udp port 123' monitoring time sync requests:
Code:22:25:37.691172 IP webserver.hprs.local.ntp > mail.hprs.local.ntp: NTPv4, Client, length 48
22:25:37.691260 IP mail.hprs.local.ntp > webserver.hprs.local.ntp: NTPv4, Server, length 48
22:28:32.273708 IP dbvmhost.hprs.local.ntp > mail.hprs.local.ntp: NTPv4, Client, length 48
22:28:32.273877 IP mail.hprs.local.ntp > dbvmhost.hprs.local.ntp: NTPv4, Server, length 48
22:33:09.294234 IP dbserverx.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:34:40.280509 IP 192.168.0.60.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:34:59.909542 IP OHPRSstorage.hprs.local.ntp > mail.hprs.local.ntp: NTPv4, Client, length 48
22:34:59.909630 IP mail.hprs.local.ntp > OHPRSstorage.hprs.local.ntp: NTPv4, Server, length 48
22:35:17.944296 IP DORIS.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:35:41.383775 IP RENEE.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:06.678297 IP 192.168.0.62.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:33.358927 IP 192.168.0.52.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:45.382615 IP 192.168.0.56.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:48.284387 IP 192.168.0.60.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68
22:36:57.894040 IP carl.hprs.local.ntp > mail.hprs.local.ntp: NTPv3, Client, length 68hosts webserver, OHPRSstorage, and dbvmhost are Linux computers. You will notice there is a query to mail.hprs.local (the DC time server), and a reply back for these hosts. The other hosts, DORIS, RENEE, 0.62, 0.57, 0.53, 0.56, 0.60, are Windows 10 computers. They send a query to mail.hprs.local, but no reply back.
I notice that the Linux hosts's query is NTPv4 and the Windows hosts query is NTPv3. Could that be it? If so, how would I change that?
I've been working on this for months with no joy.
Ideas?