diff --git a/IISMainHandler/IISMainHandler.csproj b/IISMainHandler/IISMainHandler.csproj
index 25c1ca3..411c8c5 100644
--- a/IISMainHandler/IISMainHandler.csproj
+++ b/IISMainHandler/IISMainHandler.csproj
@@ -51,6 +51,7 @@
     <Compile Include="designs\IDesign.cs" />
     <Compile Include="designs\Lite.cs" />
     <Compile Include="exceptions\RedirectException.cs" />
+    <Compile Include="exceptions\WrongUrlException.cs" />
     <Compile Include="Extensions.cs" />
     <Compile Include="HandlersFactory.cs" />
     <Compile Include="handlers\AbstractGetHandler.cs" />
diff --git a/IISMainHandler/MainHandler.cs b/IISMainHandler/MainHandler.cs
index 8a500b9..4d70c4b 100644
--- a/IISMainHandler/MainHandler.cs
+++ b/IISMainHandler/MainHandler.cs
@@ -28,8 +28,12 @@ namespace FLocal.IISHandler {
 			}
 
 			WebContext context = new WebContext(httpcontext);
-			ISpecificHandler handler = HandlersFactory.getHandler(context);
-			handler.Handle(context);
+			try {
+				ISpecificHandler handler = HandlersFactory.getHandler(context);
+				handler.Handle(context);
+			} catch(WrongUrlException) {
+				(new handlers.WrongUrlHandler()).Handle(context);
+			}
 		}
 
 		public void ProcessRequest(HttpContext context) {
diff --git a/IISMainHandler/exceptions/WrongUrlException.cs b/IISMainHandler/exceptions/WrongUrlException.cs
new file mode 100644
index 0000000..dbfad89
--- /dev/null
+++ b/IISMainHandler/exceptions/WrongUrlException.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using FLocal.Core;
+
+namespace FLocal.IISHandler {
+	class WrongUrlException : FLocalException {
+
+		public WrongUrlException() : base("wrong url") {
+		}
+
+	}
+}
diff --git a/IISMainHandler/handlers/StaticHandler.cs b/IISMainHandler/handlers/StaticHandler.cs
index 7feea22..bc42cb8 100644
--- a/IISMainHandler/handlers/StaticHandler.cs
+++ b/IISMainHandler/handlers/StaticHandler.cs
@@ -18,32 +18,37 @@ namespace FLocal.IISHandler.handlers {
 
 		public void Handle(WebContext context) {
 			if(this.requestParts.Length < 2) {
-				throw new HttpException(403, "listing not allowed");
+				//throw new HttpException(403, "listing not allowed");
+				throw new WrongUrlException();
 			}
 			
 			Regex checker = new Regex("^[a-z][0-9a-z\\-_]*(\\.[a-zA-Z]+)?$", RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Singleline);
 			string path = "";
 			for(int i=1; i<this.requestParts.Length; i++) {
 				if(!checker.IsMatch(this.requestParts[i])) {
-					throw new HttpException(400, "wrong url (checker='" + checker.ToString() + "'; string='" + this.requestParts[i] + "'");
+					//throw new HttpException(400, "wrong url (checker='" + checker.ToString() + "'; string='" + this.requestParts[i] + "'");
+					throw new WrongUrlException();
 				}
 				path += FLocal.Common.Config.instance.DirSeparator + this.requestParts[i];
 			}
 
 			string fullPath = FLocal.Common.Config.instance.dataDir + "Static" + path;
 			if(!File.Exists(fullPath)) {
-				throw new HttpException(404, "not found");
+				//throw new HttpException(404, "not found");
+				throw new WrongUrlException();
 			}
 			FileInfo fileinfo = new FileInfo(fullPath);
 			if(!fileinfo.FullName.StartsWith(FLocal.Common.Config.instance.dataDir + "Static")) {
-				throw new HttpException(403, "forbidden");
+				//throw new HttpException(403, "forbidden");
+				throw new WrongUrlException();
 			}
 			
 			string mime = Util.getMimeByExtension(fileinfo.Extension);
 			if(mime != null) {
 				context.httpresponse.ContentType = mime;
 			} else {
-				throw new HttpException(403, "wrong file type");
+				//throw new HttpException(403, "wrong file type");
+				throw new WrongUrlException();
 			}
 
 			context.httpresponse.Cache.SetExpires(DateTime.Now.AddDays(10));
diff --git a/IISMainHandler/handlers/request/MarkThreadAsReadHandler.cs b/IISMainHandler/handlers/request/MarkThreadAsReadHandler.cs
index 129db4e..fda7f04 100644
--- a/IISMainHandler/handlers/request/MarkThreadAsReadHandler.cs
+++ b/IISMainHandler/handlers/request/MarkThreadAsReadHandler.cs
@@ -17,7 +17,7 @@ namespace FLocal.IISHandler.handlers.request {
 		protected override void _Do(WebContext context) {
 			Account account = context.session.account;
 			Thread thread = Thread.LoadById(int.Parse(context.requestParts[2]));
-			if(!context.requestParts[3].StartsWith("p")) throw new CriticalException("wrong url");
+			if(!context.requestParts[3].StartsWith("p")) throw new WrongUrlException(); //throw new CriticalException("wrong url");
 			Post post = Post.LoadById(int.Parse(context.requestParts[3].PHPSubstring(1)));
 
 			if(post.thread.id != thread.id) throw new CriticalException("id mismatch");
diff --git a/IISMainHandler/handlers/request/MigrateAccountHandler.cs b/IISMainHandler/handlers/request/MigrateAccountHandler.cs
index 1e28d4e..0e5642c 100644
--- a/IISMainHandler/handlers/request/MigrateAccountHandler.cs
+++ b/IISMainHandler/handlers/request/MigrateAccountHandler.cs
@@ -44,7 +44,7 @@ namespace FLocal.IISHandler.handlers.request {
 			string userInfo = ShallerGateway.getUserInfoAsString(account.user.name);
 			Regex regex = new Regex("\\(fhn\\:([a-z0-9]+)\\)", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Singleline);
 			Match match = regex.Match(userInfo);
-			if(!match.Success) throw new FLocalException("key (fhn:***) not found on user info page");
+			if(!match.Success) throw new FLocalException("key (fhn:***) not found on user info page ( http://forumlocal.ru/showprofile.php?User=" + account.user.name + "&What=login&showlite=l )");
 			string check = Util.md5(match.Groups[1].Value +  " " + Config.instance.SaltMigration + " " + account.id);
 			if(check != context.httprequest["check"]) throw new FLocalException("Wrong key (fhn:" + match.Groups[1].Value + ")");
 			if(context.httprequest.Form["password"] != context.httprequest.Form["password2"]) throw new FLocalException("Passwords mismatch");
diff --git a/IISMainHandler/handlers/response/LegacyPHPHandler.cs b/IISMainHandler/handlers/response/LegacyPHPHandler.cs
index b4bee96..515e6fe 100644
--- a/IISMainHandler/handlers/response/LegacyPHPHandler.cs
+++ b/IISMainHandler/handlers/response/LegacyPHPHandler.cs
@@ -12,10 +12,12 @@ namespace FLocal.IISHandler.handlers.response {
 		protected override string getRedirectUrl(WebContext context) {
 			string[] scriptParts = context.requestParts[0].Split('.');
 			if(scriptParts.Length != 2) {
-				throw new FLocalException("wrong url");
+				//throw new FLocalException("wrong url");
+				throw new WrongUrlException();
 			}
 			if(scriptParts[1].ToLower() != "php") {
-				throw new FLocalException("wrong url");
+				//throw new FLocalException("wrong url");
+				throw new WrongUrlException();
 			}
 
 			switch(scriptParts[0].ToLower()) {
@@ -31,7 +33,8 @@ namespace FLocal.IISHandler.handlers.response {
 				case "showprofile":
 					return "/User/" + User.LoadByName(context.httprequest.QueryString["User"]).id.ToString() + "/";
 				default:
-					throw new NotImplementedException("unknown script " + scriptParts[0]);
+					//throw new NotImplementedException("unknown script " + scriptParts[0]);
+					throw new WrongUrlException();
 			}
 		}
 
diff --git a/IISMainHandler/handlers/response/LegacyUploadHandler.cs b/IISMainHandler/handlers/response/LegacyUploadHandler.cs
index e5fe415..0d733d7 100644
--- a/IISMainHandler/handlers/response/LegacyUploadHandler.cs
+++ b/IISMainHandler/handlers/response/LegacyUploadHandler.cs
@@ -9,10 +9,10 @@ namespace FLocal.IISHandler.handlers.response {
 	class LegacyUploadHandler : RedirectGetHandler {
 
 		protected override string getRedirectUrl(WebContext context) {
-			if(context.requestParts.Length != 3) throw new FLocalException("wrong url");
+			if(context.requestParts.Length != 3) throw new WrongUrlException();// throw new FLocalException("wrong url");
 			string[] parts = context.requestParts[2].Split('.');
-			if(parts.Length != 2) throw new FLocalException("wrong url");
-			if(parts[0].PHPSubstring(0, 4).ToLower() != "file") throw new FLocalException("wrong url");
+			if(parts.Length != 2) throw new WrongUrlException();// throw new FLocalException("wrong url");
+			if(parts[0].PHPSubstring(0, 4).ToLower() != "file") throw new WrongUrlException();// throw new FLocalException("wrong url");
 			int rawFileNum = int.Parse(parts[0].PHPSubstring(4));
 			int fileNum;
 			switch(parts[1].ToLower()) {
@@ -26,7 +26,8 @@ namespace FLocal.IISHandler.handlers.response {
 					fileNum = 600000 + rawFileNum;
 					break;
 				default:
-					throw new FLocalException("wrong url");
+					//throw new FLocalException("wrong url");
+					throw new WrongUrlException();
 			}
 			return "/Upload/Item/" + fileNum + "/";
 		}