After R/3 System RFC Connection, 'System failure with remote system' Message

Hi gurus,

I have some question about create a R/3 Connection.

I make a new RFC Connection with SM59 to connect and get data of another R/3 system.

I do below jobs..

<SOURCE SYSTEM : SAP RELEASE 702, TARGET SYSTEM : SAP RELEASE 700>

1. SM59 - make a new RFC connection ( insert target host : ip address. system number, logon client, user, password, select unicode) with connection type '3(ABAP Connection)'.

2. click Connection Test button and its OK

3. SPRO - Governance,Risk and Compliance - Common Component Settings - Intergration Framework - Maintain Connectors and Connection Types.

    'Define Connectors' --> Add target connector.

    'Assign Connectors to Connector Groups' --> Add target connector.

4. SPRO - Governance,Risk and Compliance - Common Component Settings - Integration Framework - Maintain Connection Settings

   Intergration Scenario : AM

  and Add target connector each subscenario definition in Scenario-Connector Link

After of all, to Test, in Rule Setup - Continuous Monitoring - Data Source - Create New Data Source.

Select Sub Scenario and main connector, and click 'main table lookup' and click 'Apply' but message 'SYSTEM FAILURE WITH REMOTE SYSTEM XXXXX' shown.

Please help,

Thank you,

smolee