rdweb 500.19 authentication request

Question

I have problems with the WebAccess Server on Windows Server 2016 - all current patches applied

It does not matter which client I use, (localhost, domain pc, external pc) I always receive error 500.19

(the screenshot is from localhost)

I set up rdweb on a different temporary server, where it runs without a problem. I compared the settings, but I cannot find any major differences. Even the mentioned web.config is the same on both server.
I set up trace in web.config of rdweb and FailedReqLogFiles - both do not show any logs.
I tried to deinstall rd-web-access but even that fails (error 0x800f0922).
I would like to keep the server, since it runs WSUS, WDS, RDS licence server and AD License Server.

I have to admit that I had some problems with rds after changing the name of the domain. I guess that it stopped working then. Before that it worked....

(I am not sure how to generate an english error page)

Thanks for any help!

Answer 1

Apparently it was an IIS problem. As soon as I found the differences in
c:\windows\system32\inetsrv\config\applicationHost.config
regarding RDWeb and added the default ones (from my test machine) I could deinstall rd-web-access from the server and install it again.

That fixed the problems and answered the question regarding the commented authentication node in web.config. I just did not know the applicationHost.config did exist.

Thanks for you time and suggestions
SebNeu

Answer 2

Hi,

As you mentioned that you have changed domain name, please check the web.config file and see if the domain name as below is correct. You should put the updated domain name.

<httpRedirect enabled="true" destination="https://remote.domain.com/rdweb" childOnly="true" />
</system.webServer>
</configuration>

Below article described that the error code 0x80070021 can occur when the specified portion of the IIS configuration file is locked at a higher configuration level.
To resolve this problem, unlock the specified section, or do not use it at that level.
https://learn.microsoft.com/en-us/troubleshoot/iis/http-error-500-19-webpage#hresult-code-0x80070021

Also, you can try below actions to see if the issue could be resolved.
https://forums.iis.net/post/1974992.aspx

-> Take IIS backup.
-> Open IIS
-> Click on server module node at the top of the left hand tree and choose "Modules".
-> Right click on DynamicCompressionModule and choose "Unlock"
-> Right click on StaticCompressionModule and choose "Unlock".
-> Open desired websites -> Open Modules.
-> Right click on DynamicCompressionModules and choose "remove".
-> Right click on StaticCompressionModule and choose "Remove".
-> Do IISRESET.

Hope the information helps.

Thanks,
Eleven

----------

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Answer 3

Thank you very much!

Commenting the the authentication part did the trick

<security>
    <authentication>
        <!-- <windowsAuthentication enabled="false" />
        <anonymousAuthentication enabled="true" />-->
    </authentication>
</security>

</system.webServer>

I am not sure if this is secure, though ;-) Anyway it is working now!

so I tackled the feeds part and got the next error:

[NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.]
   Microsoft.TerminalServices.Publishing.Portal.FormAuthentication.WebFeedLoginHandler.ProcessRequest(HttpContext context) +389
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +789
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +194
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87

The Eventlog gave following information:

Event code: 3005 
Event message: Es ist eine unbehandelte Ausnahme aufgetreten. 
Event time: 28.10.2020 15:11:04 
Event time (UTC): 28.10.2020 14:11:04 
Event ID: c867a015176c469c911e13adb6b14329 
Event sequence: 4 
Event occurrence: 1 
Event detail code: 0 

Application information: 
    Application domain: /LM/W3SVC/1/ROOT/RDWeb/FeedLogin-7-132483678646248403 
    Trust level: Full 
    Application Virtual Path: /RDWeb/FeedLogin 
    Application Path: C:\Windows\Web\RDWeb\FeedLogin\ 
    Machine name: XXXX 

Process information: 
    Process ID: 9000 
    Process name: w3wp.exe 
    Account name: IIS APPPOOL\RDWebAccess 

Exception information: 
    Exception type: NullReferenceException 
    Exception message: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
   bei Microsoft.TerminalServices.Publishing.Portal.FormAuthentication.WebFeedLoginHandler.ProcessRequest(HttpContext context)
   bei System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   bei System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   bei System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)



Request information: 
    Request URL: https://<fqdn>/RDWeb/FeedLogin/WebFeedLogin.aspx 
    Request path: /RDWeb/FeedLogin/WebFeedLogin.aspx 
    User host address: ::1 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: IIS APPPOOL\RDWebAccess 

Thread information: 
    Thread ID: 55 
    Thread account name: IIS APPPOOL\RDWebAccess 
    Is impersonating: False 
    Stack trace:    bei Microsoft.TerminalServices.Publishing.Portal.FormAuthentication.WebFeedLoginHandler.ProcessRequest(HttpContext context)
   bei System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   bei System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   bei System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Custom event details: 

Edit: I found some posts about uninstalling some .net 4.6.1 related kbs on Windows Server 2012. But I have a 2016 and cannot find any .net reference.

Any idea here?

Thank you!

Answer 4

Hi,

Since the issue is IIS related, we suggest that you should post your question to IIS forum so that the IIS engineer can provide correct guidance.

https://forums.iis.net/

Thanks,

Eleven

If the Answer is helpful, please click "**Accept Answer" and upvote it.**

Answer 5

I wasn't even aware this is an IIS problem - thank you very much, I will post it there!

Sebastian