No existing Publicfolder matches the identity '\'

We are in the process of migrating from Exch 2003 to 2010. Despite a troublesome installation of 2010, most seems OK. However we have the following issues with Public folders and replication:

on the 2010 server, EMC tools Public folder management console cannot connect to or view the public folder DB "No existing PublicFolder matches the following identity: '\'

Public folders do appear to be replicating since the DB matches the size of the DB on the 2003 server. We can view public folder content from a test mailbox on the 2010 server but the exch2003 server reports all public folders are "Local Modified" instead of "In Sync". In Exchange system manager -> tools -> Monitoring & Status -> Status - the new 2010 server is reported as "unreachable" and if you select properties a pop-up reports:
"Unable to connect to the WMI service
....
ID no c1038692"
It reports that the new server is stopped and it can't find the state of the server's services.
- all services are running normally on both servers.

Any help much appreciated.