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I tried the following command using my Mac Terminal

scp -rp /path/file user@SERVER_IP:/path/destination/folder

It gives me following error:

user@SERVER_IP: Permission denied (public key).
lost connection

Is there any ports that i am missing to open?

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    Hello, are you able to connect to the server over ssh? – pa4080 Mar 12 at 7:51
  • I am using GC Compute Engine. I am able to connect using SSH button on VM Instance on GC – Maqsud Inamdar Mar 12 at 7:57
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    "Is there any ports that i am missing to open?" no you are missing a public key. Please read up on how security works in regards to scp. – Rinzwind Mar 12 at 8:31
  • See for instance askubuntu.com/questions/803908/… But be careful. Doing it incorrectly can lock you out. – Rinzwind Mar 12 at 8:33
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    Does this answer your question? Filezilla or WinSCP alternative for Ubuntu – pa4080 Mar 12 at 13:50
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Normally, scp asks for a password. To avoid this, or to automate file copying in scripts, public key authentication is usually used. The basic idea is to create a key pair on the client and copy the public key to the server into an authorized keys file.

Sources: https://www.ssh.com/ssh/scp#configuring-public-key-authentication

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