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Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.
Problem with your editing or Wikipedia behavior (under any account or IP address) - your account or a connected IP has been used in a problematic way or there is a concern about your editing. Problem with your username - your username was unsuitable and has been blocked; you need to choose another before continuing.
DNS poisoning is one way in which websites can be blocked. Others are IP blocking and keyword filtering. China Firewall Test - Test your website from real browsers in China. You can review performance reports and waterfall charts for further analysis and element-by-element performance detail from multiple locations.
On 13 April 2018, messaging service Telegram was banned by court order for refusing to grant the Federal Security Service (FSB) access to encrypted user communications. [58] [59] The ban has been enforced via the blockage of over 15.8 million IP addresses.
However, IP addresses should almost never be indefinitely blocked. Many IP addresses are dynamically assigned and change frequently from one person to the next, and even static IP addresses are periodically reassigned or have different users. In cases of long-term vandalism from an IP address, consider blocks over a period of months or years ...
If the block is an autoblock, the reviewing administrator may need to email the appellant to ask for their IP address. If the block is a checkuser block, send it to review by checkusers; If the block is an open proxy block, send it to review by WP:OPP; If the block is an Arbcom block, direct the user to Arbcom list
Banned users, too, have special rules for their appeals. See WP:UNBAN for procedures of ban appeal. Users banned by the community (but not under ArbCom bans or blocks designated to be appealed to ArbCom only) are normally unbanned only after a community discussion at the administrators' noticeboard determines whether there is consensus to lift ...
Ban evasion can be detected by tracing a user's IP address. If two accounts are using the same IP address, it could be a sign of ban evasion. Also, the use of a VPN, shown by rapid, drastic changes of IP address by the same user in a short period of time, can also be a sign that the user was trying to get around a ban. Ban evasion can also be ...