ISC - Health Monitor shows up an "unknown" server status

Hello,

I've some problem with the ISC Health Monitor - it keeps my server
status into an "unknown" state. Everything else works (almost) perfectly.
I'm running it on linux RH 5 - isc 6.0.1.1 - tsm 5.5

I activated the HEALTH trace as proposed in the Problem determination
guide, the following messages appear :
[7/3/08 9:04:33:805 GMT] 00000040 api 3
checkForChanges Look for
server PHR_BACKUP_ARCHIVE report name overallHealth
[7/3/08 9:04:33:806 GMT] 00000040 api 1
getStatus Unable to find server
PHR_BACKUP_ARCHIVE
[7/3/08 9:04:33:806 GMT] 00000040 api 3
getStatus StatusManager Contains the
following values:

[7/3/08 9:04:33:806 GMT] 00000040 api 3
getStatus Found the following bean
StatusBean[reportId=overallHealth, failureCode=1302, lastUpdate=Thu Jul
03 09:04:33 GMT 2008, status=0]
Variable List:
None
Rule List:
None


When I synchronize the ADMIN_CENTER password through the ISC, the
activity log proves it's done correctly.

Has anyone an idea ?

Regards,
Marc REYNES