Enable Service from database when not visible in Modify service type.
If you want to enable a service but not able to find the service in Modify Service Type.

Solution
Connect to ARCON Database ARCOSDB.
Run the below query with the Connector you want to enable.

select * from sso_table_values where tbv_description like '%mobaxterm%'

Replace mobaxterm with connector you want to enable.
After you find the required connector. Use the tbv_id given in the result for the next query.

Update sso_table_values set tbv_code='srv_typ' where tbv_id=275

Replace 275 with your tbv_id for the connector.