Sntp configuration in SF500 seems not working

Question

I am experiencing the following issue:
SF500 switch is configured at the office and installed at remote location.   I check the clock setting (with CLI) after installing and see that the clock is NOT synchronized with the sntp server.
Then i go into cli and remove and add the same sntp server.  And - surprise - the time is synchonized.....
What am i doing wrong here?  Below is the output from the time part of the running-config, and a show version
SW-test#sh ver
SW version    1.3.0.62 ( date  02-May-2013 time  14:56:31 )
Boot version    1.3.0.03 ( date  23-Jul-2012 time  10:32:34 )
SW-test(config)#
SW-test#wr
Overwrite file [startup-config].... (Y/N)[N] ?Y
15-May-2013 21:36:12 %COPY-I-FILECPY: Files Copy - source URL running-config destination URL flash://startup-config
15-May-2013 21:36:23 %COPY-N-TRAP: The copy operation was completed successfully
Copy succeeded
show run
clock timezone CET +1
clock summer-time NED recurring last sun mar 02:00 last sun oct 03:00
clock source sntp
sntp unicast client enable
sntp unicast client poll
sntp server 172.27.3.1
SW-test#ping 172.27.3.1
Pinging 172.27.3.1 with 18 bytes of data:
18 bytes from 172.27.3.1: icmp_seq=1. time=20 ms
18 bytes from 172.27.3.1: icmp_seq=2. time=20 ms
18 bytes from 172.27.3.1: icmp_seq=3. time=20 ms
18 bytes from 172.27.3.1: icmp_seq=4. time=20 ms
----172.27.3.1 PING Statistics----
4 packets transmitted, 4 packets received, 0% packet loss
round-trip (ms) min/avg/max = 20/20/20
SW-test#conf t
SW-test(config)#no sntp server 172.27.3.1
SW-test(config)#sntp server 172.27.3.1
SW-test(config)#
SW-test#sh clock
 16:32:10 CET  Mar 1 2015

Answer 1

Ok, i just discovered that there probably also should be a "poll" after the sntp server ip addresses.
sntp server 172.27.3.1 poll