Using scp with a forwarded ssh agent

scp does not support to forward your agent (hardcoded to be disabled in the code) so this is not possible what you are trying.
The problem is in sudo. Connection to ssh-agent is stored in environment variable SSH_AUTH_SOCK (echo $SSH_AUTH_SOCK) and this variable is not preserved during the sudo so there are two possibilities:
- Do not use sudo to scp. Run just scp to some sane location and then sudo cp the file to the desired location.
- Force sudo to preserve env. variables using the -E switch:
```
sudo scp -r <new_folder> <second-server-path>
```
When you want to copy the file between two servers, use -3 switch, which will make both authentications from your host, where you have access to your agent.

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