I'm trying to monitor three databases on a single Oracle server, each with a different SID (call them SID1, SID2, and SID3). I'm using the Oracle SQL v2 sensor. (Previously I had been monitoring all three databases with older sensor, but a recent Oracle upgrade broke those sensors.)
Two of the sensors, monitoring SID1 and SID2, work fine. The third one, monitoring SID3, fails with:
ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
But this SID worked previously with the old sensor, before the upgrade. The tnsnames.ora file correctly lists the SID as SID3. So what could be wrong with this setup?
I'm running PRTG 188.8.131.522+.