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Install PuTTY tools:
sudo apt install putty-tools
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Convert .ppk to .pem using putty-tools:
puttygen jenkins-server.ppk -O private-openssh -o jenkins-server.pem
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Set correct permission for key file:
chmod 400 jenkins-server.pem
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Connect to server using .pem key file via ssh:
ssh -i server1.pem [email protected]
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