A potentially dangerous Request.Cookies value was detected from the client

Hello,

In my monitoring i get this error sometimes:

<growth ta...").
System.Web.HttpRequestValidationException (0x80004005): A potentially dangerous Request.Cookies value was detected from the client (Dynamicweb.SessionVisitor="...rDynamics=<dynamics><growth ta...").
at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection)
at System.Web.HttpRequest.ValidateCookieCollection(HttpCookieCollection cc)
at System.Web.HttpRequest.get_Cookies()
at Dynamicweb.Environment.Web.Request.get_Cookies()
at Dynamicweb.Environment.CookieManager.GetCookieOptInLevel()
at Dynamicweb.Environment.CookieManager.CanCookieBeSet(Cookie cookie)
at Dynamicweb.Tracking.Tracker.get_Current()
at Dynamicweb.Tracking.Web.ApplicationBeforeEndRequestSubscriber.OnNotify(String notification, NotificationArgs args)
at Dynamicweb.Extensibility.Notifications.NotificationManager.Notify(String notification, NotificationArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
" class="form-control auto-size" disabled="disabled" rows="15">2020-07-02 10:11:15.662: A potentially dangerous Request.Cookies value was detected from the client (Dynamicweb.SessionVisitor="...rDynamics=<dynamics><growth ta...").
System.Web.HttpRequestValidationException (0x80004005): A potentially dangerous Request.Cookies value was detected from the client (Dynamicweb.SessionVisitor="...rDynamics=<dynamics><growth ta...").
at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection)
at System.Web.HttpRequest.ValidateCookieCollection(HttpCookieCollection cc)
at System.Web.HttpRequest.get_Cookies()
at Dynamicweb.Environment.Web.Request.get_Cookies()
at Dynamicweb.Environment.CookieManager.GetCookieOptInLevel()
at Dynamicweb.Environment.CookieManager.CanCookieBeSet(Cookie cookie)
at Dynamicweb.Tracking.Tracker.get_Current()
at Dynamicweb.Tracking.Web.ApplicationBeforeEndRequestSubscriber.OnNotify(String notification, NotificationArgs args)
at Dynamicweb.Extensibility.Notifications.NotificationManager.Notify(String notification, NotificationArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

All work well but this message appear a lot of times.

Why this error happen ?

Thanks,

Jose

Developer forum

A potentially dangerous Request.Cookies value was detected from the client

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