Can't remotely connect to my server if I automatically set date and time

Hello.
I have configured my OS X 10.6.2 server and am able to remotely manage it.
The only ports I have opened on my router is for Mail and VPN services.
Things work perfectly because I can connect using VPN to iChat, iCal, Address Book, Server Admin, Workgroup Manager, AFP, FTP and such.
The problem is that on my laptop from home, or wherever, if its time is set to update automatically from an NTP server (I have tried with Apple's as well as my server for the NTP Servers) then I cannot connect to my server at all...
The moment I turn off the auto date and time and reconnect to the office's VPN, I am able to use Server Admin, AFP, FTP, Workgroup Manager, Screen Sharing, etc, etc, etc.
It's utterly frustrating because I have to open system preferences, disable the automatic date and time update, connect to the VPN and do stuff on the server. Then I have to disconnect from VPN and re enable the auto date and time.
Could someone explain why this is happening and any possible solutions I might be able to try?
Thanks in advance,
Felipe.

OK, after some testing things seem to be working now.
I opened the NTP port for my server (So I don't have to be on VPN to update the time)....But regardless of that, Server admin and my corporate site work fine.
Here is my problem, I don't understand why it's working now when 30 minutes ago I was having trouble connecting to my server regardless of what NTP Server I used.
The only service I can't access is Workgroup Manager, but I don't know if that is supposed to be accessible only locally (though it doesn't matter since I can screen share but I would still like to know).
Thanks in advance,
Felipe.

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