Hard to say without any configuration info. Most likely you have the option
"on fast networks..." enabled so it will still try to connect via RPC over
HTTP on the local network.

--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
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Real World Questions, Real World Answers

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"Simon" wrote in message
...
Hi all

Easy one for you all

Basically RPC over HTTP is working fine out of office. But when the user
is
back in the office and connected locally they are always getting the
username/password dialog box and i want to irradicate this as they have
already authenticated on the network. Can anyone advise me

Thanks