Problem with RHEL native mode cluster build

           I am building a 2 node RHEL native mode cluster with GFS2. During shutdown both servers intermittently hang with the following error message repeating:

openais[6590]:  [TOTEM] entering GATHER state from 3.

openais[6590]:  [TOTEM] The consensus timeout expired.

This is RHEL 5.5

Can anyone provide any help on this issue or how I can go about troubleshooting it?

Mark