Hi,
the problem for me is that sntp try to use high ports and get timeouts. I was looking for alternative which uses only port 123.

server2:~ # sntp -V -P no -r LANtimeserver
sntp options: a=2 v=2 e=0.100 E=5.000 P=2147483647.000
d=15 c=5 x=0 op=1 l=/etc/sntp.pid f= LANtimeserver
sntp: receive timed out after 3 seconds
sntp: receive timed out after 3 seconds
sntp: receive timed out after 3 seconds
sntp: receive timed out after 3 seconds
sntp: receive timed out after 3 seconds
sntp: not enough valid responses received in time

server2:~ # sntp -V -P no -r pool.ntp.org
sntp options: a=2 v=2 e=0.100 E=5.000 P=2147483647.000
d=15 c=5 x=0 op=1 l=/etc/sntp.pid f= pool.ntp.org
sntp: offset=0.003+/-0.009 disp=0.023
sntp: correction 0.003 +/- 0.023+0.009 secs - ignored

I set up time sync with yast-> Network Services -> NTP configuration now it seems working.