I have a rather weird problem with a zenoss install

I changed the network config of my zenoss server

the config didnt not work out, so it left the server unreachable, and also not able to reach its monitored devices.

I corrected my config to a working one and I manually cleared the "network unreachable" events that had been generated.

I realised only a handful devices were monitored at this stage.

Most devices continue to be marked as "down" on their status page.

I restarted zenoss, but these devices are still not being monitored, no snmp graphs, rrds are not updated

I reboted this zenoss machine and still the problem persist.

zenhub run -v10  end is error:

2012-05-09 19:41:30,548 DEBUG zen.Plugins: Loading collector plugins from: /opt/zenoss/ZenPacks/ZenPacks.zenoss.ZenossVirtualHostMonitor-2.3.0-py2.4.egg/ZenPacks/zenoss/ZenossVirtualHostMonitor/modeler/plugins

Traceback (most recent call last):

  File "/opt/zenoss/Products/ZenHub/zenhub.py", line 613, in ?

    z = ZenHub()

  File "/opt/zenoss/Products/ZenHub/zenhub.py", line 269, in __init__

    reactor.listenTCP(self.options.pbport, pb.PBServerFactory(pt))

  File "/opt/zenoss/lib/python/twisted/internet/posixbase.py", line 328, in listenTCP

    p.startListening()

  File "/opt/zenoss/lib/python/twisted/internet/tcp.py", line 739, in startListening

    raise CannotListenError, (self.interface, self.port, le)

twisted.internet.error.CannotListenError: Couldn't listen on any:8789: (98, 'Address already in use').

in zenhub.log evrything seems ok, except that I see:

INFO zen.ZenHub: Worker reports 2012-03-09 10:45:34,277 WARNING zen.ZenStatus: device 'device_name' network '192.168.1.0/24' not in topology

if i run zenperfsnmp run -v10 -d device_name

I get  the following:

.....

.....

2012-03-09 10:02:53,874 DEBUG zen.zenperfsnmp: Finished fetching configs for 1 devices

2012-03-09 10:02:53,874 DEBUG zen.zenperfsnmp: Gathering performance data for device1.mydomain.com

2012-03-09 10:02:53,874 INFO zen.zenperfsnmp: Configured 1 of 1 devices

2012-03-09 10:02:53,874 DEBUG zen.zenperfsnmp: Getting device ping issues

2012-03-09 10:02:55,003 DEBUG zen.thresholds: Checking value 0 on Daemons/localhost/zenperfsnmp_eventQueueLength

2012-03-09 10:02:55,004 DEBUG zen.MinMaxCheck: Checking zenperfsnmp_eventQueueLength 0 against min None and max 1000

2012-03-09 10:02:55,004 DEBUG zen.zenperfsnmp: Queueing event {'manager': 'zenoss.domain.com', 'eventKey': 'high event queue', 'device': 'localhost', 'eventClass': '/Perf', 'summary': 'threshold of high event queue restored: current value 0.00', 'component': '', 'monitor': 'localhost', 'agent': 'zenperfsnmp', 'severity': 0}

2012-03-09 10:02:55,004 DEBUG zen.zenperfsnmp: Total of 1 queued events

2012-03-09 10:02:56,086 DEBUG zen.zenperfsnmp: unresponsive devices: [['server0053', 2, 64946], ['server0061, 1, 1], ......

...

...

......and so on listing all servers not working properly

Any ideas