"Unknown" status when doing lsnrctl status

ORACLE 9.2.0.4 on Solaris 8 (upgarded from 8.1.7.3 to 9.2.0.1 to 9.2.0.4)

I have this strange problem that when I do LSNRCTL STATUS, it shows all the services have status "Unknown". I can connect remotely just fine so it does not affect the functionality. However, I am just curious whey it all have "Unknown" status. Below is a partial output form LSNRCTL STTAUS. BTW, this started to occur after ugrading to 9.2.0.1.

------
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "qa.gs.com" has 1 instance(s).
Instance "qa", status UNKNOWN, has 1 handler(s) for this service...
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Thanks,

This is most probably due to SID_LIST entry in your listener.ora file. Although it is not a problem, oracle recommends not to use this parameter(PLSExtProc being the exception). HTH.