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To create a working, stable Dota 2 keyless auth system, Valve's authentication servers needed to be able to produce unique IDs for Steam accounts for use in the protocol. To do so, they took advantage of an undocumented feature of Windows called NTLM hashes. The system looked at past Windows login access records and calculated what it believed to be the correct hash based on that data. Unfortunately, this resulted in many people being randomly locked out of their own accounts! It turns out that, back when you installed Steam on your computer, it copied an old Windows login token from your user profile into one of its folders under “AppData\\Local\\Steam” (it could also create a new one). This token was eventually used by Valve to generate new unique IDs for Steam accounts, but it also contained the account's username and IP address. Because IP addresses are not allowed to be shared outside of your home network, this resulted in many people getting locked out of their own accounts! (Valve later removed the ability to share IPs.) This caused a lot of confusion and poor customer relations. The lockout system was redesigned after receiving complaints from customers who were locked out of their accounts. While no longer using NTLM hashes, it still used Windows credentials to authenticate users. This caused a new wave of problems with both keys being stolen and no longer being compatible with third-party antivirus programs. The system was redesigned again in 2016. The new system only uses the client's Steam ID to authenticate users via a unique, server-generated hash. This removes the user's IP address from the authentication process entirely, while still using Windows credentials to protect against account theft.In 2012, Valve introduced steamrep.com, a website that displays a small record of players' SteamID and their actions on Steam servers. Users can visit the site and report false information about other users, including claims of being abusive "trolls" or "troublemakers". Valve also employs a team of moderators that remove reported information after it is determined not to be true or legitimate. Rules and punishments for violating Valve's user policy can be found on the Steam Support website. Steam users were distributed into three levels: friend, blocked, and stranger. Strangers could neither send friend requests nor chat. The stranger level was due to be replaced by an "offline" flag (used to indicate that the user is currently unavailable), but this has not yet occurred as of May 2017. In 2016, Steam introduced a new way of blocking other users which provides far greater flexibility in blocking friends or strangers. Users are able to block all communication, sending of friend requests or chat messages between them, regardless of whether the other party is online or offline. This feature has the advantage of giving users much greater control over who they wish to interact with. However, it has also been criticized for being difficult to understand and for having an obscure interface that is not immediately clear even to experienced users. Users can set what appeals are sent when they are reported or banned by other users, allowing them to choose whether they accept the abuse report or ban. For example, a user may wish to allow all legitimate reports of player-killing or aimbotting, but block all impersonation or spam reports. eccc085e13
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