FIX: RDS Query Times Out After Five Minutes

This article was previously published under Q192718
This article has been archived. It is offered "as is" and will no longer be updated.
SYMPTOMS
Remote Data Service (RDS) version 1.5 times out when trying to run querieslonger than five minutes. Clients receive the following error message:
Internet Client Error : Request Timeout.
CAUSE
The Wininet.dll has a default timeout of five minutes. RDS 1.5 used this .dllfile and its default timeout.
RESOLUTION
This limitation is fixed in RDS 2.0 and later. You may download the latest version of Microsoft Data Access Components, including RDS, from the following Web address: NOTE: RDS 1.5 is no longer available for download.

The RDS.Dataspace and RDS.Datacontrol in release 2.0 and later have a new propertyCalled InternetTimeout, which takes the following range of values:
  • Minimum value of -2,147,483,648 (Times out immediately, any negative times out immediately.)
  • Maximum value of 2,147,483,647 (596 hours or 24 days, never times out.)
  • Value of 0 (will not timeout.)
  • Negative value (will timeout immediately.)
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

This bug was corrected in RDS 2.0 and later.
MORE INFORMATION

Steps to Reproduce Behavior

To reproduce the problem create a Visual Basic ActiveX .dll that isinstalled on the server and runs under RDS from a Visual Basic clientapplication.

This example has a method called WaitForAllotedtime, which takes an inputparameter amounting to the delay that you need to create a long runningquery.

Creating the ActiveX DLL

  1. Start a new project in Visual Basic and select "ActiveX DLL". Class1 is created by default.
  2. From the Project menu, select Project1 Properties. Change the Projectname to RDSTimeOutTestObj and the Project Description to RDS Time Out Test Object. Click OK to close the Project Properties dialog box.
  3. Select Class1 in your Project Window and press F4 to view the Properties. Change the Instancing property of Class1 to "5 MultiUse".
  4. Paste the following code into the General Declarations section of Class1:
    Option ExplicitConst SUCCESS = 999Public Function WaitForAllotedtime(ByVal WaitTime As Integer) As _Integer  Pause (WaitTime) 'Introduce a delay simulating a long running query  WaitForAllotedtime = SUCCESSEnd FunctionSub Pause(ByVal nSecond As Single)  Dim t0 As Single  t0 = Timer  Do While Timer - t0 < nSecond ' This loop introduces the delay of  Dim dummy As Integer          ' nSecond using the Timer function.  dummy = DoEvents()  If Timer < t0 Then   t0 = t0 - CLng(24) * CLng(60) * CLng(60)  End If  Loop End Sub					
  5. Save the project.
  6. From the File menu, click "Make RDSTimeOutTestObj.dll". You are nowfinished creating your ActiveX .dll project.

Creating the Visual Basic Test Client

  1. Test the ActiveX .dll project by creating another Visual Basic Standard .exe project as a client.
  2. From the File menu, click New Project, and then select Standard .exeproject. Form1 is created by default.
  3. From the Project menu, select references and add a reference to theMicrosoft Remote Data Services 2.0 Library.
  4. Place a Command button, named Command1, on Form1.
  5. Paste the following code into the General Declarations section of Form1:
    Private Sub Command1_Click() Dim rs As New RDS.DataSpace Dim obj As Object Dim i As Integer rs.InternetTimeout = 305000   ' This is in milliseconds. Set obj = rs.CreateObject("RDSTimeOutTestObj.Class1", _    "http://<your server name>") i = obj.WaitForAllotedTime(301)'301 seconds, cross the 5 min barrier MsgBox i   ' Should get 999 indicating success.End Sub					
NOTE: <your server name> is the name of your Internet Information Server (IIS) server, which hosts the business object.

Registering the ActiveX .dll to Run on RDS

  1. If you are not developing on your IIS server, you need to manually copy over the .dll to the IIS server and manually register it using Regsvr32.exe. Also check to make sure the RDSTimeOutTestObj business object is correctly registered on your IIS/RDS server. To see if the component is correctly registered, look in the registry by running "regedit" from the Run menu. The components are under the HKEY_CLASSES_ROOT key in alphabetical order.
  2. Make sure your createable object has launch rights on your server. This can be done by taking the following lines and saving them in a file with a .reg extension and double-clicking the file to merge the informationinto the registry. You can also do this manually with Regedit.exe:
    REGEDIT4   ;This entry should be on one line   [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3SVC    \Parameters\ADCLaunch\RDSTimeOutTestObj.Class1]					

Testing the Application

  1. Run the Visual Basic client.
  2. Click the Command1 button.
  3. You should see a message box that displays 999, which indicates that the long running query has executed successfully without creating the following error:
    Internet Client Error : Request Timeout.
  4. To check whether the InternetTimeOut setting works you can set the InternetTimeOut value to something less than 301000 millisecond to get the error.
REFERENCES
For additional information, please see the following articles in theMicrosoft Knowledge Base:
166277 HOWTO: Create a VB Component that Returns a Recordset in RDS
For more information, please see the following World Wide Web URL:

For additional information, please see the following public newsgroup:
   microsoft.public.ado.rds				
Remote Data Services version 1.5 Readme.txt

Data Access Software Development Kit (SDK) version 2.0 DASDKReadme.txt

ActiveX Data Objects version 2.0 ADOReadme.txt

Remote Data Services version 1.5 Help in the MSDN Library

Data Access Software Development Kit (SDK) Help
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Article ID: 192718 - Last Review: 01/07/2015 07:17:49 - Revision: 2.3

Microsoft Remote Data Services 1.5

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