Copy a file with SCP on Ubuntu 14 with PEM key on both servers

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I have 2 servers on Amazon AWS. I need to pass a file from A to B.
Both servers have pem keys (different).
I put the pem file of B on A (Is that correct?)
Then tried to do from A: 

scp -i /tmp/B.pem backup.sql.gz ubuntu@ec2-XX-XX-XXX-XX.eu-central-1.compute.amazonaws.com:bckup.sql.gz

I get an error:

Permission denied (publickey).
lost connection

Whats the problem?

BTW – I opened port 22 on both

Answer

First make sure PEM key permission is correct and not open.

chmod 400 /tmp/B.pem

scp -r -i /tmp/B.pem backup.sql.gz
ubuntu@ec2-XX-XX-XXX-XX.eu-central-1.compute.amazonaws.com:/home/ubuntu/

This will copy the GZIP file on home directory of ubuntu user.

Attribution
Source : Link , Question Author : Noam B. , Answer Author : Azfar Ullah Khan

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