I have a pi3B+ with stretch. I am trying to sync its clock using a network master clock (a pc set as ntp server) through direct ethernet connection. I can't see my server synching the pi. I followed the instructions discussed here but while offline the pi cannot use my server (windows PC with w32tm running). The pi is in any case able to ping the server and viceversa, the UDP port is bidirectionally open on the server, the pi (running ntpq - pn) is able to even calculate the offset of its clock relative to the server... and this updates if I change the server time manually. Rebooting does not change anything (the pi fails to sync).
I have edited the /etc/ntp.conf file adding my server PC address adding the lines address x.x.x.x iburst fudge x.x.x.x stratum 1
any idea of why this does not work ?