Remove-scomdisabledclassinstance Power Shell cmdlet not undiscovering IIS objects for selected servers

Question

Hi All,

We are tried running the Remove-scomdisabledclassinstance Power Shell cmdlet not to discover IIS objects for which we have applied override.

We are receving the error below when we try running the cmdlet.
Can you please help me how to pass this command.

We are running this on one of the SCOM 2019 Mangement server.

Regards,
Ravi shankar

Answer 1

You may refer to Bob Cornelissen blog SCOM Object reference not set to an instance of an object, https://blog.topqore.com/scom-object-reference-not-set/.

If you get that error the best you can first do is in SCOM open up a Discovered Inventory view and check how many objects are still there (if it does not throw the same exception as the one I started with!).

Check the number of entries there.
Now run the remove-scomdisabledclassinstance command again.
If it throws the error refresh the screen to check if discovered inventory shows a lower number of discovered instances.
Keep doing that until it finishes.
Next I waited for a grooming interval and let it populate the classes again one by one by turning the discoveries back on.

Roger

Answer 2

Hi,

Roger is right. Could you try the Remove-scomdisabledclassinstance cmdlet multiple times? If it works, please mark Roger's reply as answer.

If it throws the error refresh the screen to check if discovered inventory shows a lower number of discovered instances.
Keep doing that until it finishes without errors. It may be 10-20 times in some environment.

the screenshot for your reference.
Note: click change target type to the one in your environment and check if the number is reduced after each run.

Alex
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