SSIS service does not support multi-instance

I have a server with several SQL Server instances installed on it. Why can’t I connect to all instances of SSIS on my server? I can connect to the default instance, but not to the named instances.

The error I get is:

TITLE: Connect to Server
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Cannot connect to MyServerName\test1.
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ADDITIONAL INFORMATION:
Failed to retrieve data for this request. (Microsoft.SqlServer.Management.Sdk.Sfc)
For

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