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Problem

The installation of the second scan engine will fail because the installer does an IIS check.

Environment:
SQL server
Primary Scan engine with IIS installed.
Secondary scan engine (Services only)

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Expected Behaviour:
When installing second scan engine with services only installation completes successfully.
Actual Behaviour:
When installing second scan engine:
Prerequisites checker passes, installation fails with non descriptive error. See screenshot below.
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Repro:
Install a scan engine with UI and DB (Any SE and DB configuration)
Build a second scan engine VM with no iis just Scan engine prerequisites.
Start the installer.
Select custom install
Remove UI from the list of installation items
Provide DB credentials and host name
Test the connection
Upon successful connection proceed to the next step
Verify all the prerequisites are matched proceed to the next step
Provide existing encryption key
Start the install
Installation should fail.

Solution

Navigate to Server Manager,

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Start the install to complete.

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