Remote dtc security problem   

I have 2 computers, one as server (server 2003) and other client (vista 
business). both are in same domain. Application consists of server part (IIS 
on server 2003) and client part (winforms on vista). client is configured to 
use remote dtc on server. when client starts opening distributed transaction 
i get message 
"MSDTC was unable to read its configuration information. (Exception from 
HRESULT: 0x8004D027)"
But when I add my domain user (under which is winforms client running) to 
server Administrators group, distributed transaction works fine.
I believe there is something with security...

date: Wed, 5 Dec 2007 03:56:01 -0800   author:   Viesturs