DTCPing between windows 2003 servers

[Guest dmsy]

I have a 2 node custered sql server 2005 and 2 web servers, all using

windows 2003. The database servers are behind a firewall. I am using

DTCPing to check if I am able to do DTC. When I launch DTCPing I

always get an error on the log file:

 

Platform:Windows 2003

cluster environment detected:

Reading MSDTC settings from local registry:

Windows 2003 environment is detected:

Reading MSDTC settings from local registry:

Open DTC root key failure: error(2)

 

What could posibly be causing this?