Hi @ora
To connect directly to an instance of the legacy Integration Services, Service, you have to use the version of SQL Server Management Studio (SSMS) aligned with the version of SQL Server on which the Integration Services Service is running. For example, to connect to the legacy Integration Services, Service running on an instance of SQL Server 2016, you have to use the version of SSMS released for SQL Server 2016
Please can you share the version details of all the components for better understanding.