Last Updated: 12 Oct 2021 09:12 by ADMIN
If you previewed a report from the Report Server after more than 30 minutes of inactivity, there is an error message "Forbidden. Insufficient credentials."
Last Updated: 28 Sep 2021 13:26 by ADMIN
I am using the Telerik ReportServerClient to create, update, and delete subscriptions on our Report Server from our MVC application.

I am able to set all features that I need to set, except the first dropdown of the "Repeat On" section of the recurrence rule. 
Last Updated: 27 Sep 2021 10:02 by ADMIN

If you unselect all the days from the Day of the Week in the recurrence rule of a scheduled task of data alert, the task can be saved but will throw an Internal Server Error and you won't be able to list the available tasks on the server.

The linked muted video demonstrates the problem.

Here is the error stack trace produced by the ServiceAgent:

Telerik.ReportServer.ServiceAgent.exe Information: 0 : Loaded 37 tasks in total.
Telerik.ReportServer.ServiceAgent.exe Error: 0 : System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at Telerik.WinControls.UI.Scheduler.ICalendar.CalHelper.TryParseRecurrenceRuleProperties(RecurrenceRule result, IEnumerable`1 keywordPairs)
   at Telerik.WinControls.UI.Scheduler.ICalendar.CalHelper.TryParseRRuleCore(String valueToParse, RecurrenceRule& result)
   at Telerik.ReportServer.Web.Utils.Appointment..ctor(DateTime startUtc, String recurrenceRule)
   at Telerik.ReportServer.ServiceAgent.Tasks.TaskInfo.UpdateNextOccurrenceTime(DateTime utcFrom, DateTime utcTo)
   at Telerik.ReportServer.ServiceAgent.Services.SchedulingService.CalculatePendingTasks(List`1 pendingTasks)
   at Telerik.ReportServer.ServiceAgent.Services.SchedulingService.MainLoop()
   at Telerik.ReportServer.ServiceAgent.Services.SchedulingService.StartMain()

Last Updated: 24 Sep 2021 08:55 by ADMIN

We cannot delete reports using the Report Server UI. After you select the report and choose to delete it, the report appears as removed from the list, even though the details are still visible. If you refresh the page, the report is still there.

Further investigation revealed that the ServiceAgent is not running. There is no proper error message indicating this though.

The issue is reproducible only with the Report Server running under HTTPS. When under HTTP there is a proper message stating that the ServiceAgent is stopped.

Last Updated: 21 Apr 2021 08:20 by ADMIN
Attempting to login with "Active Directory Credentials" throws an exception - A potentially dangerous Request.Form value was detected from the client (wresult="<t:RequestSecurityTo...").
Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874.
Under Review
Last Updated: 01 Apr 2021 16:41 by ADMIN


I was on a remote web session with an engineer and we discovered that the Scheduler UI isn't saving the changed password to the database. 

The environment that I use is below. 

  • Report Server is installed in an Azure Virtual Machine
    • IIS is bound to ports 443 and 83
  • The SMTP Service is on RackSpace
  • The storage is located in SQL Server

The steps to reproduce are as follows.

  1. Change the Password
  2. Save the Changes
  3. Send Test
  4. Receive Error output

During the Remote Web Assistance Session, we tried a Gmail SMTP server and received the same results. 

We also enabled tracing and noticed an error in the event logs which I will attach here. 

Please let me know if you need any additional information.

Last Updated: 25 Mar 2021 08:48 by ADMIN

In a Scheduled Task created with the Report Server API, the day of the week in the recurrence rule is not shown in the Edit Task window of the Report Server Manager. A detailed description of the issue is available in this forum post.

Last Updated: 24 Feb 2021 10:04 by ADMIN
Release R1 2021 SP1

I create a Report Book in the Standalone designer that is connected to my Report Server. When I add the first two reports, the Report Book is rendered as expected. When I add the third one, it fails with the exception:

Report processing was cancelled.
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Here is a link to a short video demonstrating the problem. All the individual reports run correctly.


Last Updated: 24 Feb 2021 10:04 by ADMIN
Release R1 2021 SP1
I updated our Telerik Report Server to Afterward, the users with custom roles could no longer see report categories.
This leads to users not being able to open the report from the table and sends them to a bad URL since the category is undefined.
Last Updated: 27 Jan 2021 11:53 by ADMIN
I have a number of scheduled tasks that use report parameter values from the report in the body of the email.  If I untick the "use default value" checkbox of a DateTime parameter, it is replaced with the DateTime. However, if the checkbox is selected, the placeholder is not replaced with the value and is displayed as it is in the mail template, e.g. "{@createdDate} ". The String parameters are never replaced with the actual values. This can be observed in versions and
Last Updated: 20 Jan 2021 14:04 by ADMIN
Release R1 2021
Created by: Waz
Comments: 1
Type: Bug Report



I have a report that is scheduled to happen first day of every month. The thing is that when I look at the next occurrence of the report, it is happening on the second day of the month. I am attaching the report settings herewith. Please let me know if you have a solution/ explanation to get this corrected. Thanks a lot in advance.



Last Updated: 18 Nov 2020 10:24 by ADMIN
Release R3 2020 SP1 (Latest Internal Build)
Our server time updated according to daylight savings time and fell back an hour.  The report scheduler, however, is sending out reports an hour early instead of using the server time.
Last Updated: 21 Oct 2020 12:15 by ADMIN
Release R3 2020 SP1
Users which only have access to their own categories can see the categories of the other users when they perform filtering - see the attached image.
Last Updated: 21 Oct 2020 12:15 by ADMIN
Release R3 2020 SP1
We have done a security analysis and we found that there are some vulnerabilities with the default Telerik reports project as below.

Poor Error Handling: Unhandled exception

Error pages containing stack traces were found on these pages:
https://reports.abc.com/Account/ForgotPassword POST parameters: __RequestVerificationToken, Email
https://reports.abc.com/Account/Login POST parameters: __RequestVerificationToken, Username, Password, RememberMe, ReturnUrl https://reports.abc.com/api/reportserver/documents/C$39cae14f81d$9809a8279f1$72d6f30af5b7ed1809a23e

Stack traces are call chains of line numbered source code that usually result from unhandled exceptions. Unhandled exceptions are circumstances in which the application has received user input that it did not expect and doesn't know how to deal with. In many cases, an attacker can leverage the conditions that cause these errors in order to gain unauthorized access to the system. Recommendations include designing and adding consistent error-handling mechanisms that are capable of handling any user input to your web application, providing meaningful detail to end-users, and preventing error messages that might provide information useful to an attacker from being displayed.
Last Updated: 21 Oct 2020 12:15 by ADMIN
Release R3 2020 SP1
Having debugging turned on comes at a significant performance cost.
Last Updated: 21 Oct 2020 12:15 by ADMIN
Release R3 2020 SP1

There are vulnerabilities in the Report Server related to Cross-Site Scripting.

Last Updated: 01 Oct 2020 07:57 by ADMIN

Getting this error in the browser when trying to preview a report:

Error registering the viewer with the service.
An error has occurred.
Incorrect value (null) deserialized. Make sure you are using CacheStorage inside single-instance application deployment only.

A possible reason is the cache for the Report Server used for previewing reports has become corrupted. A workaround is explained in the Telerik.Reporting.Cache.CacheStorage.AddInSet NullReferenceException KB article.

It will be very convenient for the user to be able to clear the cache directly from the Report Server Manager UI.

Last Updated: 16 Sep 2020 13:21 by ADMIN
Release 2020 R3

It seems that when you try to open two tabs in the same browser looking at different websites, the browser gets confused about the URL that is sending the request. Issue is related to CORS protocol and HTTP caches.

It sounds like something needs to be changed on the report server so that even if it gets cached it would still allow access when I switch sub domains.  Or something on the viewer side to clear the cache.

Last Updated: 14 Aug 2020 13:00 by ADMIN
Release 2020 R2 SP1 (Latest Internal Build)
Upgrade to R2 2020 ( or R2 2020 SP1 ( fails when the storage contains invalid DateTime values (An invalid time falls within a range of times for the current time zone that cannot be mapped to Coordinated Universal Time (UTC) due to the application of an adjustment rule. Typically, invalid times occur when the time moves ahead for daylight saving time)
Last Updated: 04 Aug 2020 14:27 by ADMIN
The Migration tool updates the source storage instance to its own version prior to migration process. This might cause issues in scenarios where an older version of Report Server storage is used in production and the migration is performed using a newer version of Migration tool. The tool must show a confirmation dialog and wait for input from user before modifying the source storage.
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