SQL Server Management Studio communicate with the [Integration Services] service over Port Number 135, this cannot be changed, unlike the SQL Server Database Engine. Therefore TCP://135 needs to be open on the firewall for Management Studio to communicate with SSIS.
End users might also need to be a member of the [Distributed COM Users] user group on the same host that the SSIS service resides. Users must be added to this group individually, as other Active Directory groups will not be recognized once added.