Here's a little more info:

I've looked through all the logs in jon-oracle.oho.com_oraclej/sysman/log.

Some are quite surprising to me...

In emdctl.trc I get things like:

WARN http: snmehl_connect: connect failed to (jon-oracle.oho.com:1830): Connection refused (error = 111)

and the same thing on port 5500. I can reach both of those ports, though, from a browser on that machine as well as a remote browser.

In emagent.trc I get a listener error:

2005-05-31 14:59:00 Thread-3001027504 WARN TargetManager: Exception in computing dynamic properties of {oraclej.oho.com, oracle_database },ComputeVC::Missing Properties : [Version]
2005-05-31 14:59:00 Thread-3001027504 WARN vpxoci: OCI Error -- ErrorCode(12541): ORA-12541: TNS:no listener

SQL = " OCIServerAttach"...
LOGIN = dbsnmp/@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=jon-oracle.oho.com)(PORT=1521))(CONNECT_DATA=(SID=oraclej)))

As noted previously, though, my listener entry is valid. I wonder, though, why it puts that whole string in instead of sayinig dbsnmp/@oraclej...

Finally, emoms.log and emoms.trc fill up with ALL sorts of Java errors... Much too many to post. My guess is that these errors occur because of the errors that the other log files are capturing.

Does that help at all? I thought it was going to help me, but I'm getting confused again.