Полечилось!

Видимо было связано с тем что на сервере стоял SUS, видимо он и убрал галку "Enable session state"

I've found multiple cases where this issue has been resolved by following the steps below:
- Open Internet Service Manager
- Go to the properties page for the site where the certsrv is installed.
- Go to Home Directory tab. Under Application Settings click the Configuration button.
- Go to the App Options tab and check Enable Session State.
- Restart IIS service.
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