I am having the same problem as  the post with 12 pages of replies and no apparent solution.

Verified registration with captch don't seem to stop them. The server is maxing 100% most of the time.

i have 46000 new user registrations........on a development site that is just a workspace for me... thank god.

I have 2000 however on a more important site.

I did notice some type of injection attempt as well as unhandled exception in the net 4 framwork.

 There is too much going on here that is above my paygrade.

We do need some help from the DNN team to secure this problem:

this is occuring between login attempts after i disabled registrations.

AssemblyVersion: 6.2.6

PortalID: 5

PortalName: xxxxxx

UserID: -1

UserName:

ActiveTabID: 236

ActiveTabName: Home

RawURL: /?ctl=register

AbsoluteURL: /default.aspx

AbsoluteURLReferrer: http://xxx

UserAgent: Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3

DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider

ExceptionGUID: a5aa6ea7-232d-4308-84c1-39a0a6b762ef

InnerException: Unhandled Error Adding Module to ContentPane

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: System.Threading.Thread.AbortInternal

StackTrace:

Message: DotNetNuke.Services.Exceptions.ModuleLoadException: Unhandled Error Adding Module to ContentPane ---> System.Threading.ThreadAbortException: Thread was being aborted. at System.Threading.Thread.AbortInternal() at System.Threading.Thread.Abort(Object stateInfo) at System.Web.HttpResponse.End() at System.Web.HttpResponse.Redirect(String url, Boolean endResponse, Boolean permanent) at DotNetNuke.Modules.Admin.Users.Register.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.UI.Modules.ModuleHost.LoadAjaxPanel() at DotNetNuke.UI.Modules.ModuleHost.CreateChildControls() at System.Web.UI.Control.EnsureChildControls() at DotNetNuke.UI.Modules.ModuleHost.get_ModuleControl() at DotNetNuke.UI.Containers.Container.get_ModuleControl() at DotNetNuke.UI.Containers.Container.ProcessModule() at DotNetNuke.UI.Skins.Pane.InjectModule(ModuleInfo module) --- End of inner exception stack trace --- at DotNetNuke.UI.Skins.Pane.InjectModule(ModuleInfo module) at DotNetNuke.UI.Skins.Skin.InjectModule(Pane pane, ModuleInfo module)

Source:

Server Name: xxxx

Hi,

As Sebastian has said, you should look through the other answers/solutions to try to stop this but I know that it is quite hard to find a solution that works with so many posts.

To help you out, PowerDnn has a good solution/work around via a post they did, it can be found here

Look at the last part about replacing the3 Dnn Captcha with the Google reCaptcha.

Or, because you said that, because it is a dev server maybe the best ( and easiest) way is to just set the registration to "None"...

Go to Admin > Site Settings > User Account Settings then choose 'None' for 'user registration' at the top.

Hope this helps,

Regards,

Geoff