Connecting to a Windows XP computer

Computers and network description.

Two Win2k Pro and one WinXP Pro computers running on a 10 Mbit workgroup network.

I have the following problem.

When trying to connect from one W2k computer that is logged in as user2 to the WinXP that is logged in as user1 I receive the following message:


Login failure: the user has not been granted the requested logon type at the computer

user1 on the other W2k computer has no problem.

I have set up all the shares with correct shares / permissions and user1 and 2 accounts are both identical on all three computers.

When I login as user2 on the WinXP, user2 can connect from either W2k but not user1.

Am I missing something fundamental here? Never had this problem with W2k.

Hope someone can help.

Thanks,

Ewan