Hi Mariano
As far as I remember I was able to connect from higher version to lower.
Regarding your error: if you have S-user you can check:http://service.sap.com/sap/support/notes/2029714
If not check this excerpt:
Error:Nested exception: java.rmiConnectException: Connection refused to host: <hostname>: nested exception is: java.net.ConnectException: Connection refused connect
Error:XCE001 Nested exception: java.rmi.RemoteException: Error on completion of HTTPS-roundtrip: java.net.SocketException:Connection reset; nested exception is: java.net.SocketException: Connection reset
- Root Cause 1
There is a problem with the diProxyHost or diProxyport values of the SLD entry. - Solution 1
In the diProxyhost field, replace the computer name with the IP address of the machine. - Root Cause 2
The integration framework and the DI Proxy are located on different machines. - Solution 2
Check the firewall settings and ensure that the 2099 port is not blocked by the firewall. - Root Cause 3
The DI Proxy service is not started. - Solution 3
Ensure that the DI Proxy service is started. - Root Cause 4
An incorrect HTTP port is set in the diproxyserver.properties file in the C:\Program Files\SAP\SAP Business One Integration\DIProxy folder. - Solution 4
Make sure that the HTTPS_PORT value is set to 2099. If you use another port, set the value accordingly. - Root Cause 5
The diProxyhost field value in the SLD entry points to a server that does not host the DI Proxy. - Solution 5
In the SLD entry in the diProxyhost field, correct the value with the information of the server that hosts the DI Proxy. - Root Cause 6
The.keystorefile in the C:\Program Files (x86)\SAP\SAP Business One Integration\DIProxy folder is missing or is corrupt. - Solution 6
Repair the integration framework installation or replace the .Keystore file with one of a correct installation. - Root Cause 7
The .jarB1iDIProxy file in the C:\Program Files (x86)\SAP\SAP Business One Integration\DIProxy folder is missing or is corrupt. - Solution 7
Repair the integration framework installation or replace the B1iDIProxy.jar file by one of a correct installation.
Kind regards,
Radek