The controller for path '/Telerik.Web.UI.DialogHandler.aspx' was not found or does not implement IController.

System.Web.HttpException: The controller for path '/Telerik.Web.UI.DialogHandler.aspx' was not found or does not implement IController.

System.Web.HttpException (0x80004005): The controller for path '/Telerik.Web.UI.DialogHandler.aspx' was not found or does not implement IController.
   at System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType)
   at System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName)
   at System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory)
   at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Logged on Sunday, April 5, 2026 at 2:39:10 AM

See also:

Server Variables

NameValue
ALL_HTTPHTTP_HOST:www.semsark.com HTTP_REFERER:http://3.120.219.56:80/Telerik.Web.UI.DialogHandler.aspx HTTP_USER_AGENT:Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity
ALL_RAWHost: www.semsark.com Referer: http://3.120.219.56:80/Telerik.Web.UI.DialogHandler.aspx User-Agent: Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity
APPL_MD_PATH/LM/W3SVC/4/ROOT
APPL_PHYSICAL_PATHC:\inetpub\wwwroot\Semsark2\
AUTH_PASSWORD*****
AUTH_TYPE
AUTH_USER
CERT_COOKIE
CERT_FLAGS
CERT_ISSUER
CERT_KEYSIZE256
CERT_SECRETKEYSIZE2048
CERT_SERIALNUMBER
CERT_SERVER_ISSUERC=US, O=Let's Encrypt, CN=R13
CERT_SERVER_SUBJECTCN=www.semsark.com
CERT_SUBJECT
CONTENT_LENGTH0
CONTENT_TYPE
GATEWAY_INTERFACECGI/1.1
HTTP_HOSTwww.semsark.com
HTTP_REFERERhttp://3.120.219.56:80/Telerik.Web.UI.DialogHandler.aspx
HTTP_USER_AGENTHello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity
HTTPSon
HTTPS_KEYSIZE256
HTTPS_SECRETKEYSIZE2048
HTTPS_SERVER_ISSUERC=US, O=Let's Encrypt, CN=R13
HTTPS_SERVER_SUBJECTCN=www.semsark.com
INSTANCE_ID4
INSTANCE_META_PATH/LM/W3SVC/4
LOCAL_ADDR172.31.24.199
LOGON_USER
PATH_INFO/Telerik.Web.UI.DialogHandler.aspx
PATH_TRANSLATEDC:\inetpub\wwwroot\Semsark2\Telerik.Web.UI.DialogHandler.aspx
QUERY_STRING
REMOTE_ADDR198.235.24.85
REMOTE_HOST198.235.24.85
REMOTE_PORT64524
REMOTE_USER
REQUEST_METHODGET
SCRIPT_NAME/Telerik.Web.UI.DialogHandler.aspx
SERVER_NAMEwww.semsark.com
SERVER_PORT443
SERVER_PORT_SECURE1
SERVER_PROTOCOLHTTP/1.1
SERVER_SOFTWAREMicrosoft-IIS/10.0
URL/Telerik.Web.UI.DialogHandler.aspx