How check connection for backint?

Hello everybody,

I have a landscape with SAP server separated by media server. I purchased SAP agent, installed it and copied to folder where SAP is installed. If I launch the backup job from DB13, it fails when executing the BACKINT program.
The command line is this:

backint.exe -u SID -f backup -i E:\oracle\SID\sapbackup\.bekiiuqx.lst -t file -p E:\usr\sap\SID\SYS\exe\nuc\NTAMD64\biparam.ini -c

My content of biparam.ini is:

[General]

Server= SERVER-IP

Job Name=Backup SAP side -

 

[Backup]

Backup Catalog=off

Job Template=DEFAULT

and this is located in the path specified before, in initSID.sap with the parameter "util_par_file"

The return error code is 2, and it says me: "Unable to connect to Backup Exec server: \\SERVER-IP"

I checked this document, and all that point are checked. So, how can I check the connection for backint and find the error?

Thank you