Cherry-pick to 7.9: [DOC] Add firewall as possible troubleshooting issue (#21743)#22040

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dedemorton merged 1 commit intoelastic:7.9from dedemorton:backport/7.9/pr-21743

Oct 21, 2020

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Commits on Oct 21, 2020

[DOC] Add firewall as possible troubleshooting issue (elastic#21743 )

lucabelluccini
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dedemorton
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