W32 time problem on SBS2003 Premium


Am having the same problem with W32Time as others here.
System is SBS2003 with SP1.
Do not have ISA installed and have follwed the instructions at :
http://www.smallbizserver.net/Default.aspx?tabid=142 to the letter.
Have tried numerous time servers, am currently using ptbtime1.ptb.de which
is working fine with our router. All outbound router ports are open.

Command w32tm /resync always errors with could not be synced since no time
available.
After 24 hours the usual "The time service has not synchronized the system
time for 86400 " etc etc in the log.

If anyone out there has further ideas for fixing I would be very grateful.

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