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Question

WebLink experiencing Error HTTP 503

WebLink Laserfiche
Updated 7 hours ago
asked one day ago • Show version history

Over the weekend, our WebLink portal experienced an event that caused error HTTP 503. We had to reset the Web Link Application Pool to bring back the portal online, but we haven't been able to identify the root cause of the issue. I would appreciate some guidance or help on how to eliminate this issue from happening. Below is the event details:

 

Log Name:      Laserfiche-Portal-Server/Operational
Source:        Laserfiche-Portal-Server
Date:          7/12/2025 3:16:14 AM
Event ID:      14
Task Category: ImportantWarning
Level:         Warning
Keywords:      Session0,Session1,Session2,Session3
User:          IIS APPPOOL\WebLinkAppPool
Computer:      XXXXXXXXXXXXXXXXXXXXXX
Description:
  Message: Exception encountered, stack trace:\r\n  WebLink.LFDSHelper.DisableLFDSConfigurations\r\n  WebLink.Global.Application_Start\r\n  System.RuntimeMethodHandle.InvokeMethod\r\n  System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal\r\n  System.Reflection.RuntimeMethodInfo.Invoke\r\n  System.Reflection.MethodBase.Invoke\r\n  System.Web.HttpApplication.InvokeMethodWithAssert\r\n  System.Web.HttpApplication.ProcessSpecialRequest\r\n  System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode\r\n  System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS\r\n  System.Web.HttpApplication.InitSpecial\r\n  System.Web.HttpApplicationFactory.GetSpecialApplicationInstance\r\n  System.Web.Hosting.PipelineRuntime.InitializeApplication\r\nException details:\r\n  Caught exception HttpException, Message: Request is not available in this context\r\n  Stack trace:    at System.Web.HttpContext.get_Request()\r\n   at WebLink.LFDSHelper.DisableLFDSConfigurations()\r\n

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Laserfiche-Portal-Server" Guid="{7dcfe07a-d2f9-5fcb-2720-8b35ac94bd41}" />
    <EventID>14</EventID>
    <Version>0</Version>
    <Level>3</Level>
    <Task>65520</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000f00000000000</Keywords>
    <TimeCreated SystemTime="2025-07-12T07:16:14.295294500Z" />
    <EventRecordID>10612254</EventRecordID>
    <Correlation />
    <Execution ProcessID="7584" ThreadID="1788" />
    <Channel>Laserfiche-Portal-Server/Operational</Channel>
    <Computer>LFWeb2.int.huroncounty.ca</Computer>
    <Security UserID="S-1-5-82-1636015418-3244278796-3669185834-2196197702-1451905062" />
  </System>
  <EventData>
    <Data Name="message">  Message: Exception encountered, stack trace:\r\n  WebLink.LFDSHelper.DisableLFDSConfigurations\r\n  WebLink.Global.Application_Start\r\n  System.RuntimeMethodHandle.InvokeMethod\r\n  System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal\r\n  System.Reflection.RuntimeMethodInfo.Invoke\r\n  System.Reflection.MethodBase.Invoke\r\n  System.Web.HttpApplication.InvokeMethodWithAssert\r\n  System.Web.HttpApplication.ProcessSpecialRequest\r\n  System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode\r\n  System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS\r\n  System.Web.HttpApplication.InitSpecial\r\n  System.Web.HttpApplicationFactory.GetSpecialApplicationInstance\r\n  System.Web.Hosting.PipelineRuntime.InitializeApplication\r\nException details:\r\n  Caught exception HttpException, Message: Request is not available in this context\r\n  Stack trace:    at System.Web.HttpContext.get_Request()\r\n   at WebLink.LFDSHelper.DisableLFDSConfigurations()\r\n
</Data>
  </EventData>
</Event>

 

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Replies

replied one day ago

Which version of WebLink do you use? Similiar error (#337466) was reported on WebLink 10 when scrolling a long listing, and the fix was included in WebLink 11.

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replied 20 hours ago

We had the same problem back in February 2025. It was recommended for us to upgrade WebLink and LFDS to version 11 and we did this. The solution was successful, the problem was eliminated, but now it is occurring again. I would appreciate any guidance on this issue. Thank you.

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replied 11 hours ago

The error occurred today again. Here is the error I captured. Please let me know if you have seen this before and what we should do to resolve it. Thank you.

 

Log Name:      Laserfiche-Portal-Server/Operational
Source:        Laserfiche-Portal-Server
Date:          7/15/2025 2:00:44 PM
Event ID:      14
Task Category: ImportantWarning
Level:         Warning
Keywords:      Session0,Session1,Session2,Session3
User:          IIS APPPOOL\WebLinkAppPool
Computer:     XXXXXXXXX
Description:
Operation: /WebLink/Helper/TileData.aspx?repo=CoH&docID=2444642&x=5&y=4&pageNum=1&scale=2483&ro=0&time=1752602358578&showAnn=1&pageID=1066351&search=6ad5e4a5-a363-4361-834a-b6eb96a8da25
  Message: Exception encountered, stack trace:\r\n  WebLinkControls.Tiling.<ProcessRequestAsync>d__7.MoveNext\r\n  System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start\r\n  WebLinkControls.Tiling.TileRequestHandler.ProcessRequestAsync\r\n  System.Web.TaskAsyncHelper.BeginTask\r\n  System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute\r\n  System.Web.HttpApplication.ExecuteStepImpl\r\n  System.Web.HttpApplication.ExecuteStep\r\n  System.Web.PipelineStepManager.ResumeSteps\r\n  System.Web.HttpApplication.BeginProcessRequestNotification\r\n  System.Web.HttpRuntime.ProcessRequestNotificationPrivate\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotification\r\n  System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion\r\n  System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotification\r\nException details:\r\n  Caught exception ArgumentNullException, Message: Value cannot be null.\r\nParameter name: session\r\n  Stack trace:    at Laserfiche.RepositoryAccess.Entry.GetEntryInfo(Int32 entryId, ISession session)\r\n   at WebLinkControls.OpenEntries.GetEntry(Int32 id, OpenOption ooption, ShortcutOption scoption)\r\n   at WebLinkControls.PageCache.GetPages(WLConnection conn, Int32 id, Int32 version, OpenOption ooption)\r\n   at WebLinkControls.Tiling.TileRequestHandler.<ExtractImage>d__8.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at WebLinkControls.Tiling.TileRequestHandler.<ProcessRequestAsync>d__7.MoveNext()\r\n
  Session: br4mv30g

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Laserfiche-Portal-Server" Guid="{7dcfe07a-d2f9-5fcb-2720-8b35ac94bd41}" />
    <EventID>14</EventID>
    <Version>0</Version>
    <Level>3</Level>
    <Task>65520</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000f00000000000</Keywords>
    <TimeCreated SystemTime="2025-07-15T18:00:44.102956700Z" />
    <EventRecordID>10637763</EventRecordID>
    <Correlation />
    <Execution ProcessID="1768" ThreadID="2440" />
    <Channel>Laserfiche-Portal-Server/Operational</Channel>
    <Computer>LFWeb2.int.huroncounty.ca</Computer>
    <Security UserID="S-1-5-82-1636015418-3244278796-3669185834-2196197702-1451905062" />
  </System>
  <EventData>
    <Data Name="message">Operation: /WebLink/Helper/TileData.aspx?repo=CoH&amp;docID=2444642&amp;x=5&amp;y=4&amp;pageNum=1&amp;scale=2483&amp;ro=0&amp;time=1752602358578&amp;showAnn=1&amp;pageID=1066351&amp;search=6ad5e4a5-a363-4361-834a-b6eb96a8da25
  Message: Exception encountered, stack trace:\r\n  WebLinkControls.Tiling.&lt;ProcessRequestAsync&gt;d__7.MoveNext\r\n  System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start\r\n  WebLinkControls.Tiling.TileRequestHandler.ProcessRequestAsync\r\n  System.Web.TaskAsyncHelper.BeginTask\r\n  System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute\r\n  System.Web.HttpApplication.ExecuteStepImpl\r\n  System.Web.HttpApplication.ExecuteStep\r\n  System.Web.PipelineStepManager.ResumeSteps\r\n  System.Web.HttpApplication.BeginProcessRequestNotification\r\n  System.Web.HttpRuntime.ProcessRequestNotificationPrivate\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotification\r\n  System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion\r\n  System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper\r\n  System.Web.Hosting.PipelineRuntime.ProcessRequestNotification\r\nException details:\r\n  Caught exception ArgumentNullException, Message: Value cannot be null.\r\nParameter name: session\r\n  Stack trace:    at Laserfiche.RepositoryAccess.Entry.GetEntryInfo(Int32 entryId, ISession session)\r\n   at WebLinkControls.OpenEntries.GetEntry(Int32 id, OpenOption ooption, ShortcutOption scoption)\r\n   at WebLinkControls.PageCache.GetPages(WLConnection conn, Int32 id, Int32 version, OpenOption ooption)\r\n   at WebLinkControls.Tiling.TileRequestHandler.&lt;ExtractImage&gt;d__8.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at WebLinkControls.Tiling.TileRequestHandler.&lt;ProcessRequestAsync&gt;d__7.MoveNext()\r\n
  Session: br4mv30g
</Data>
  </EventData>
</Event>

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replied 7 hours ago

This error was different from the previous one, and it usually happened when user leaved the page inactive for long and the session was disconnected, but the user tried to load more data on the page. 

If you can reproduce the issue, please open a support ticket and provide reproduce steps. If the error was only observed in event log, you may leave it there.

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