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    <p>Best solution for me is to filter IPs in IIS.<br> I've done it and it works properly ... and you do not have to change a single line of code.</p> <p>If you do not have access to IIS, then you can follow Scott Hanselman's <a href="http://www.hanselman.com/blog/AnIPAddressBlockingHttpModuleForASPNETIn9Minutes.aspx" rel="nofollow">suggestion</a> and create a custom <code>HttpModule</code>:</p> <pre><code>namespace YourModuleNameHere { public class IPBlackList : IHttpModule { private EventHandler onBeginRequest; public IPBlackList() { onBeginRequest = new EventHandler(this.HandleBeginRequest); } void IHttpModule.Dispose() { } void IHttpModule.Init(HttpApplication context) { context.BeginRequest += onBeginRequest; } const string BLOCKEDIPSKEY = "blockedips"; const string BLOCKEDIPSFILE = "SiteConfig/blockedips.config"; public static StringDictionary GetBlockedIPs(HttpContext context) { StringDictionary ips = (StringDictionary)context.Cache[BLOCKEDIPSKEY]; if (ips == null) { ips = GetBlockedIPs(GetBlockedIPsFilePathFromCurrentContext(context)); context.Cache.Insert(BLOCKEDIPSKEY, ips, new CacheDependency(GetBlockedIPsFilePathFromCurrentContext(context))); } return ips; } private static string BlockedIPFileName = null; private static object blockedIPFileNameObject = new object(); public static string GetBlockedIPsFilePathFromCurrentContext(HttpContext context) { if (BlockedIPFileName != null) return BlockedIPFileName; lock (blockedIPFileNameObject) { if (BlockedIPFileName == null) { BlockedIPFileName = context.Server.MapPath(BLOCKEDIPSFILE); } } return BlockedIPFileName; } public static StringDictionary GetBlockedIPs(string configPath) { StringDictionary retval = new StringDictionary(); using (StreamReader sr = new StreamReader(configPath)) { String line; while ((line = sr.ReadLine()) != null) { line = line.Trim(); if (line.Length != 0) { retval.Add(line, null); } } } return retval; } private void HandleBeginRequest(object sender, EventArgs evargs) { HttpApplication app = sender as HttpApplication; if (app != null) { string IPAddr = app.Context.Request.ServerVariables["REMOTE_ADDR"]; if (IPAddr == null || IPAddr.Length == 0) { return; } StringDictionary badIPs = GetBlockedIPs(app.Context); if (badIPs != null &amp;&amp; badIPs.ContainsKey(IPAddr)) { app.Context.Response.StatusCode = 404; app.Context.Response.SuppressContent = true; app.Context.Response.End(); return; } } } } } </code></pre> <p>and use it in your <code>web.config</code>:</p> <pre><code>&lt;system.web&gt; &lt;httpModules&gt; &lt;add type = "YourModuleNameHere.IPBlackList, YourAssemblyNameHere" name="IPBlackList" /&gt; &lt;/httpModules&gt; &lt;/system.web&gt; </code></pre>
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    1. POmake site available only from given ip
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    1. PTAnswer
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    1. COI dont have an access to iis
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    2. CO@gruber: I've extended my answer.
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      1. USLeftyX
 

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