Add a public SSH key to your remote git host to prepare its repositories for connection with the Git Integration for Jira app.
Do the following steps to setup SSH for your remote git host:
Login to your remote git host.
Go to the SSH configuration page, if supported.
Paste the public key to the provided box or upload the public key file and complete the setup.
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More on Working with SSH keys
Adding a public SSH Key (this page)
Adding and associating SSH keys