Some clients can't connect after 10.6.6 update - the see an error -43

Hi There,
I'm a designer so am not all that technical but have managed to setup and maintain OS X servers since 10.5.
I've just updated the server to 10.6.6 and now some of our clients can't connect - they get the following error:
"There was an error connecting to the server. Check the server name or IP address and try again.
If you are unable to resolve the problem contact your system administrator."
If I click OK to the error above on the client, I see another error which reads:
"The operation cannot be completed because one or more required items cannot be found.
(Error code -43)"
I've restarted the server and the clients but no luck.
The server is running the following services:
- AFP
- DNS
- Firewall
- NFS (although I don't remember setting this up - is this started with AFP?)
- Open Directory
I can ping the server and login via ARD so not sure why we see the first IP address error as mentioned above.
Any help or suggestions would be most welcome.
Regards
Ben

One question, is this when you hit "Connect to Server" or is this after you've established a connection and try to open/edit/save files?
Here is some general advice:
1) I assume your whole network is behind a router and that we are talking a small office environment (5-10 people) and not some large enterprise. If so the Firewall service can probably be disabled. As a matter of fact if your issue is that clients can't connect at all the firewall may actually be causing your problem.
2) NFS can almost certainly be disabled. Its generally only used for two reasons 1) The netboot service needs it. 2) You support unix/bsd clients. I can see from your list of services that netboot isn't something you're doing and I doubt that as a designer you would have much use for unix/bsd systems.

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