Arc uses the TM1 REST API to connect to an IBM Planning Analytics (TM1) instance. You can either connect to a TM1 instance using the admin host port or using the TM1 REST API port of a specific TM1 instance.

In the settings.yml file if you define an Adminhost with the Admin host REST API port (5898 is the default one), Arc will be able to connect to all TM1 instances on this admin host:

To connect to multiple admin hosts, an extra line for each remote admin host.

Another way to connect to a TM1 instance is to use the REST API port of a TM1 instance (HttpPortNumber in tm1s.cfg). This will be beneficial if you are connecting to a cloud environment and only the REST API port has been opened.

More details are available in the following article:

• Connect to a TM1 instance directly via TM1 REST API

As long as the TM1 REST API is open, Arc can connect to a TM1 instance on the IBM Cloud, more information in the following article:

• Using Arc with TM1 instances are hosted on the IBM Cloud SaaS

Starting with Arc v2.4, it is now possible to group admin hosts and connections together and toggle between the groups:

• Grouping TM1 servers and instances in Arc