Note: You can also close issues automatically with keywords in pull requests and commit messages. For more information, see "Linking a pull request to an issue."
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On your GitHub Enterprise Server instance, navigate to the main page of the repository.
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Under your repository name, click Issues.

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In the list of issues, click the issue you'd like to close.
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Optionally, to change your reason for closing the issue, next to "Close issue," select , then click a reason.

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Click Close issue.