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Known Issue: HTTP 500 and "Could not load file or assembly" errors may occur after upgrading a beacon to version 2020 R2.2 (16.2) due to web.config file not being updated (IOJ-2183358)

Symptoms

After upgrading a FlexNet Manager Suite beacon to the 2020 R2.2 (16.2) release, agent logging may show HTTP 500 "internal server error" failures when attempting to upload and download data from the beacon.
 
For example:

[08/03/2021 10:38:58 (N, 0)] {4108} Downloading “http://beacon/ManageSoftDL/Policies/Merged/_domain/Machine/hostname.npl?machinename=hostname&ipaddress=10.23.45.67” to “C:\Windows\TEMP\NDL29503.npl”
[08/03/2021 10:38:58 (G, 0)] {4108}   Download failure: Error 0xE05001F4: 500 Internal Server Error
[08/03/2021 10:38:58 (U, 0)] {4108} ERROR: Error (s107m857)
[08/03/2021 10:38:58 (U, 0)] {4108} ----------------
[08/03/2021 10:38:58 (U, 0)] {4108} The web server or proxy from which ManageSoft
is attempting to retrieve the application
returned the following HTTP error message:

	Error 0xE05001F4: 500 Internal Server Error

Contact your network administrator or the
originating site's Webmaster for assistance.

[08/03/2021 10:38:58 (N, 0)] {4108} Download FAILED for “http://beacon/ManageSoftDL/Policies/Merged/_domain/Machine/hostname.npl?machinename=hostname&ipaddress=10.23.45.67”

Diagnosis

To further qualify this problem, logon to the beacon and browse to http://localhost/ManageSoftDL. A beacon affected by this problem will display a page reporting an error like either of the following:

Could not load file or assembly 'System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies.

Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies.

The Application event log on the beacon will also show errors like the following:

Process information: 
    Process ID: 5428 
    Process name: w3wp.exe 
    Account name: IIS APPPOOL\Flexera Beacon 
 
Exception information: 
    Exception type: HttpException 
    Exception message: Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
   at System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app)
   at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers)
   at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context)
   at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)
   at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
   at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter..ctor()
   at System.Net.Http.Formatting.JsonMediaTypeFormatter..ctor()
   at System.Net.Http.Formatting.MediaTypeFormatterCollection.CreateDefaultFormatters()
   at System.Web.Http.HttpConfiguration.DefaultFormatters(HttpConfiguration config)
   at System.Web.Http.HttpConfiguration..ctor(HttpRouteCollection routes)
   at System.Web.Http.GlobalConfiguration.<CreateConfiguration>b__0()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at System.Web.Http.GlobalConfiguration.get_Configuration()
   at Flexera.Beacon.IISWeb.Global.Application_Start(Object sender, EventArgs e)

Cause

This problem occurs because the beacon upgrade process may not merge new assembly bindings into the beacon's web.config file.

Solution

Modify the C:\Program Files (x86)\Flexera Software\Inventory Beacon\DotNet\Web.config file on the beacon and replace the lines within the <assemblyBinding> element with the following:

<dependentAssembly>
  <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>
  <bindingRedirect oldVersion="0.0.0.0-10.0.0.0" newVersion="10.0.0.0"/>
</dependentAssembly>
<dependentAssembly>
  <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31BF3856AD364E35" culture="neutral"/>
  <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0"/>
</dependentAssembly>
<dependentAssembly>
  <assemblyIdentity name="System.Web.Http" publicKeyToken="31BF3856AD364E35" culture="neutral"/>
  <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0"/>
</dependentAssembly>
<dependentAssembly>
  <assemblyIdentity name="Autofac" publicKeyToken="17863af14b0044da" culture="neutral"/>
  <bindingRedirect oldVersion="0.0.0.0-5.2.0.0" newVersion="5.2.0.0"/>
</dependentAssembly>
<dependentAssembly>
  <assemblyIdentity name="System.Threading.Tasks.Extensions" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-4.2.0.1" newVersion="4.2.0.1" />
</dependentAssembly>

After editing this file, restart Microsoft Internet Information Services (IIS) and the Beacon Engine Windows service.

Fix status

This issue has been fixed in the following FlexNet Manager Suite releases: 2020 R2.3 / Apr 2021 (Cloud), 2021 R1 (On Premises)

Other information

Master issue ID: IOJ-2183358

Also known as: FNML-73099

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known-issue-http-500-and-could-not-load-file-or-assembly-errors-may-occur-after-upgrading-a-beacon-to-version-2020-r2-2-16-2-due-to-web-config-file-not-being-updated-ioj-2183358

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Known Issue: HTTP 500 and "Could not load file or assembly" errors may occur after upgrading a beacon to version 2020 R2.2 (16.2) due to web.config file not being updated (IOJ-2183358)