database - connecting two hosts oracle linux on virtual box -


i new oracle. have problem when i'm going backup data 1 host other host using rman. i'm using sftp establish connection between 2 hosts on virtual box. first database's hostname oradb1 , second oradb2. use command establish connection 

[oracle@oradb1 ~]$ sftp oracle@oradb2 connecting oradb2 ssh: oradb2: temporary failure in name resolution couldn't read packet: connection reset peer

what should do? or ideas how config it.


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