{{pg|Commons:Administrators|Administrators}} are given the ability to administerissue '''blocks''' to users when appropriate. A blocked user is restricted from editing and uploading files, among other things. In a general sense, blocks are a last resort for behaviour that has the potential to damage Commons or disrupt its collegial atmosphere. In this way, blocking is designed to be a ''preventative'' measure and not a ''punitive'' one; "cool-down" blocks are not condoned.

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* '''Open or anonymizing proxies''' are typically blocked upon {{pg|Commons:Open proxy detection|detection}} in accordance with [[metam:Special:MyLanguage/No open proxies|Wikimedia-wide policy]]. The normal duration of such blocks is one year.

* '''[[:mw:Special:MyLanguage/Help:Range blocks|Range blocks]]''' are especially powerful tools, and discussion of these is particularly encouraged. Range blocks with a duration longer than 24 hours should be discussed with a {{pg|Commons:Checkusers|checkuser}} to assess the likely impact.

In exceptional cases, there may be a need to block an editor on the basis of oversighted information that cannot be shared publicly. In such a case, the available {{pg|Commons:oversighters|oversighters}} may jointly act on the basis of group consensus. If there are insufficient oversighters available or if additional input is required they may consult the [[:metam:stewards|Wikimedia stewards]].

* [[metam:Global locks]], [[metam:Global blocks]], and [[metam:Global bans]]: similar concepts spanning all Wikimedia projects

{{TNT|Commons policies and guidelines}}

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