Autoblock/ja

自動ブロック (autoblock) は、MediaWiki ソフトウェアにより行われる IP アドレスに対する自動的なブロックです. 自動ブロックは、ブロックされた利用者が最近使用した IP アドレスからウィキを編集しようと試みた際に、その結果として実施されます.

利用者がウィキを編集するたびに、サイトに接続する際に使用した IP アドレスが、そのウィキを支える MediaWiki ソフトウェアによって記録されます. 各利用者が使用した IP アドレスの記録は、非公開で保持されており、MediaWiki ソフトウェアでのチェックユーザーのアクセス権を持つ利用者のみがアクセスできます. ブロックされた利用者が当該サイトの編集を試みた際、編集に使用した IP アドレスが、ブロックされた利用者と同じ設定 (ブロック期間とメール送信のブロックを除く) で「自動ブロック」されるため、匿名や別の利用者名での同じ編集ができなくなります. If another user then attempts to use that autoblocked IP, they are autoblocked as well, and any other IP addresses that they may attempt to use while blocked, are autoblocked as well. Then other users who use those IP addresses may also be blocked, and onward. In some situations, this system can spiral and many users may be autoblocked even if they did nothing blockworthy.

自動ブロックされた利用者のブロック解除
If a user is autoblocked, such as if a named user was unblocked, but their IP address is still autoblocked, an admin can clear the autoblock by:


 * Special:BlockList の一覧の内容を検証し、当該利用者のアカウント名を検索します. この検索では大文字/小文字が区別されます. 
 * 関連付けられている #xxxxx の番号を特定します. この番号で検索する場合は、「#」を含めるようにしてください.
 * 「」リンクをクリックすることで #xxxxx をブロック解除します

自動ブロックを消去すると、その利用者のアカウント名が一覧には表示されなくなることにご注意ください.

記録のメッセージ
Sometimes the term Autoblock disabled will show up in a block message. This means that when the user was blocked, that only their username was blocked, but other users on the same IP are still free to edit.

The default setting for a block is to have Autoblock enabled, but it generally does not say this explicitly in a block message. To disable the default autoblocking of an account, admins must manually uncheck the box that says " ".

動作の仕組み


When an autoblock occurs, users may be autoblocked as the result of a block on another user, who was probably using the same ISP. So a different user may end up blocked, even though they have personally done nothing wrong. This is referred to as "collateral damage". 例:


 * 1) User:Susan, an administrator, blocks User:Bort for 24 hours. Unknown to Susan, Bort uses AOL to edit the wiki, and an autoblock was enabled at the time of the block.
 * 2) User:Steven, who also uses AOL from home, and is currently assigned the IP address last used by Bort, signs on to the wiki
 * 3) The MediaWiki software, detecting the use of the IP address by Steven, and assuming it to be Bort, issues a 24 hour block on Steven, in admin Susan's name. Susan is not notified of the block.
 * 4) Steven receives a "You have been blocked" message, doesn't understand what an autoblock is, and angrily demands to know why admin Susan has blocked him.
 * 5) Steven tries to login from his work computer (which does not use AOL).
 * 6) The MediaWiki software senses that Steven is trying to get around his block, and autoblocks his work IP as well.
 * 7) One of Steven's co-workers, who happens to use the same work IP, tries to access the wiki.
 * 8) The MediaWiki software senses the co-worker, and autoblocks them too, as well as any future IP addresses they may use.
 * 9) And so on...

It is important for users to understand that administrators do not set autoblocks; once they have blocked a user with autoblocking enabled, autoblocks are set by the MediaWiki software. Autoblocks do not appear in administrators' block logs, and the administrators are not notified of them. This is a necessary consequence of keeping logged-in users' IP addresses private. So while the IP address responsible for each edit is recorded by the MediaWiki software, this cannot be accessed, even by administrators and even when the user is blocked.

追跡
If is enabled a cookie will be set on a autoblocked user's browser. This means that the user will still be blocked even after logging out and moving to a new IP address.

This cookie means that, when a blocked user moves to a new IP address, the original block will be loaded and (because it's an autoblock) that new IP address will now be blocked.

This form of tracking is dependent on the user's browser retaining the cookie, and so will not work for all blocked users in all situations. The feature is intended to provide a small extra level of protection against blocks being circumvented.

自動ブロックの無効化
When a block is issued, autoblocking is usually turned on by default, except for common dynamic IP ranges, such as those used by AOL. A list of such automatically exempt IP ranges can be found at MediaWiki:Autoblock whitelist.

Administrators can disable autoblocking at the time of blocking a user, by unchecking the checkbox. Once an "enabled" block is placed, it can also be fixed by modifying the user's block, but this should not be done unless absolutely necessary.

自動ブロックのリセット
There is an internal autoblock expiry time variable,, which is set to 24 hours, meaning that autoblocks only last for 24 hours. However, in the case of dynamic IP pools (such as those used by AOL), this may affect hundreds of users before the block expires. So in the case of an indefinite block, autoblocks may continue to be set by the software, weeks or months after the initial block has been set. Older indefinite blocks, dating from before the autoblock exemption whitelist and the option to disable when blocking, may also trigger autoblocks.

Ipblocklist
When IP addresses are autoblocked, they appear in Special:Ipblocklist (but not in the admin's block log) with a special mask that prevents the IP address from being seen. Autoblocks register on Special:Ipblocklist, Special:AutoblockList and in the banner available to the blocked user, with the name of the admin that set the original block. However, the admin is not notified that an autoblock has been placed. Diligent administrators who lift a block early may wish to check the Ipblocklist in order to check for any autoblocks that need to be cleared.

ヒント

 * It is helpful for all involved, especially AOL users, who are often chronically autoblocked by collateral damage, to remain patient and remember that it is the software that is responsible for the autoblock, not the administrator who is unfortunate enough to have his or her name appear on the block log.
 * Equally important is for admins to check Special:Ipblocklist and Special:AutoblockList regularly, and unblock all autoblocks from a particular user if more than two autoblocks are set in rapid succession.
 * If more than two IP addresses are autoblocked within seconds/minutes of each other, it is a good indication that it is a dynamic IP pool and the blocks are collateral damage.