Fixing a root url
You get this warning when your Jenkins URL refers to "localhost" instead of an IP address or domain name. To fix this warning:
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Go to Jenkins > Manage Jenkins > Configure System, and locate the section titled "Jenkins Location". You should see the warning here as well.
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Replace "localhost" with a valid hostname.
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Click Save.
URLs do not match
If you access Jenkins from a URL other than what is configured in the "Jenkins Location" section of Jenkins > Manage Jenkins > Configure System, then you should see a warning that URLs do not match.
To fix it, click Take me to the recommended URL.
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