Cluster nodes loosing communication

Hello,

http://support.microsoft.com/kb/2462468

I have checked the services on both nodes, they are all started: Cluster Service, TCP/IP etc... all automatic services are started on both nodes.

Log Name:      Application
Source:        SRMSVC
Date:          3/9/2015 11:56:25 AM
Event ID:      12317
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      MBFSCL1B.ad.
Description:
File Server Resource Manager failed to enumerate share paths or DFS paths.  Mappings from local file paths to share and DFS paths may be incomplete or temporarily unavailable.  FSRM will retry the operation at a later time.

Error-specific details:
   Error: NetShareEnum, 0x80070005, Access is denied.

this event is only on Node B....

get-clusteraccess

IdentityReference             AccessControlType        ClusterRights
-----------------             -----------------        -------------
NT AUTHORITY\SYSTEM           Allow                    Full
NT AUTHORITY\NETWORK SERVICE  Allow                    Full
BUILTIN\Administrators        Allow                    Full
NT SERVICE\MSDTC              Allow                    Full

Where to look for more information about this issue as periodically, once or twice a week the two nodes do not see each other!!!

I restart the services (Cluster Service) and they see each other again!!!

This cluster has been working fine for 3 years and the issue came within the last two weeks!!!

- Changes:

- Tivoli upgrades

- Security tied

etc...

not sure what could have created this problem, any clue?

Thanks,

Dom

System Center Operations Manager 2007 / System Center Configuration Manager 2007 R2 / Forefront Client Security / Forefront Identity Manager