ntpd setup - permission denied on all public ntp-servers

[Nakal]

I have read the FreeBSD handbook and tried to setup ntpd on my PC to have an 
accurate time. I checked the list of public ntp servers and configured 
ntp.conf like this:

server ptbtime1.ptb.de iburst
server ptbtime2.ptb.de iburst

driftfile       /etc/ntp.drift
restrict default ignore


Then I wanted to run 'ntpd -ddd -q' from the commandline. The command never 
finishes to run (e.a. is not successful). And I get the following output in 
my /var/log/messages:

Apr 28 18:39:40 myhost ntpd_initres[1714]: server returns a permission denied 
error

What is going on? Do I need to have cryptography enabled? I think it should be 
documented in the FreeBSD Handbook (it is usually a reliable source of 
information).

I have tried to use authentication:

Apr 28 18:48:53 myhost ntpd[1756]: configure: keyword "crypto" unknown, line 
ignored
Apr 28 18:48:53 myhost ntpd[1756]: configure: keyword "keysdir" unknown, line 
ignored

but it seems it's not compiled for crypto. US-export restrictions again? Any 
ideas how to solve the problem?

Martin