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asp.net interop memory limitation

I have an asp.net app which uses legacy COM interop library. Works fine until memory reaches somewhere around 500Mb and then it is no longer able to create new COM objects (get various exceptions, e.g. Creating an instance of the COM component with CLSID {FFFF-FFFF-FFFF-FFF-FFFFFF} from the IClassFactory failed due to the following error: 80070008.). It almost looks like it is hitting some kind of memory limit, but what is it? Can it be changed?

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