i am also getting the same error on the agents installed servers. i checked the time settings and they are correct. Also able to ping servers. i have manually insalled he agent.

i checked the time settings and they are correct. Also able to ping servers. i have manually insalled he agent. but not able to view them on the pending list for approval.

observed the following events on the agent insalled server.
Event Type:        Error
Event Source:    OpsMgr Connector
Event Category:                None
Event ID:              20057
Date:                     5/15/2009
Time:                     2:40:22 PM
User:                     N/A
Computer:          XVMDS3AEX0J
Description:
Failed to initialize security context for target MSOMHSvc/xvmds3aex0o.usie7.local The error returned is 0x80090303(The specified target is unknown or unreachable
).  This error can apply to either the Kerberos or the SChannel package.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Event Type:        Error
Event Source:    OpsMgr Connector
Event Category:                None
Event ID:              21001
Date:                     5/15/2009
Time:                     2:40:22 PM
User:                     N/A
Computer:          XVMDS3AEX0J
Description:
The OpsMgr Connector could not connect to MSOMHSvc/xvmds3aex0o.usie7.local because mutual authentication failed.  Verify the SPN is properly registered on the server and that, if the server is in a separate domain, there is a full-trust relationship between the two domains.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Event Type:        Error
Event Source:    OpsMgr Connector
Event Category:                None
Event ID:              21016
Date:                     5/15/2009
Time:                     2:40:26 PM
User:                     N/A
Computer:          XVMDS3AEX0J
Description:
OpsMgr was unable to set up a communications channel to xvmds3aex0o.usie7.local and there are no failover hosts.  Communication will resume when xvmds3aex0o.usie7.local is both available and allows communication from this computer.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.