Unable to connect SSIS remotely

I was working with one of my client queries and they were having issue while connecting to SSIS on the database server, SQL1, from the application server, APP1. They were getting the below error message:

Connecting to the Integration Services service on the computer « SQL » failed with the following error: « Class not registered ».?

Looking at the error message, it indicates that something is not registered or perhaps this issue is related to some missing DLLs. This is not something related to security or connection blockage.

I first checked the versions of SSIS and SSMS on the application server, APP1, from