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<script runat="server">
Private Sub Application_OnBeginRequest(ByVal sender As Object, ByVal e As EventArgs)
        Dim application As HttpApplication = CType(sender, HttpApplication)
        Dim strRegex As String = "\.aspx[;,()!^]+$"
        Dim RegexObj As System.Text.RegularExpressions.Regex = New Regex(strRegex)
        Dim url As String = application.Request.Url.AbsolutePath
        If RegexObj.IsMatch(url) Then
            url = Regex.Replace(url, strRegex, ".aspx" )
            HttpContext.Current.Response.Status = "301 Moved Permanently"
            HttpContext.Current.Response.AddHeader("Location", url)    
        End If        
        HttpContext.Current.RewritePath(url)        
    End Sub
</script>

Now you would just put all of this into your Global.asax file. The Global.asax (for those that don’t know) executes on every request, and therefore every url that is submitted to the site will execute through this function.

Basically this function will take the url passed in, and if it contains one or more of the following characters

;,()!^

after a “.aspx” it will remove them, and then bring the user to the fixed URL. Note that there may be more special characters you can add other than this, but these are all I tested with. Also note that characters such as a period and a colon will not work as they are special URL characters already, and apparently the server will try to render the URL even before calling the OnBeginRequest function. Also note that this does not fix query strings and/or strange characters after a query string.

The function will also throw a 301 permanent redirect with a location of the fixed URL – this is for the search engines so that they know the page is not valid and where to go instead (basically for SEO).

In any case, this may not be the perfect solution (then again, I don’t know what else could be implemented…perhaps an ISAPI filter?), but it does cover most instances or bad URL’s linking to your site.