Background Task Error 0x80270257 in Win10 TP build 9926

Background task will not run after restarting system.
EventViewer: Microsoft-Windows-BackgroundTaskInfrastructure/Operational Error 0x80270257
Even windows official apps has this error.
What's wrong???
thanks

Hi,
Does the error occurs in windows 8 or windows 8.1? If not, I think the problem may related to windows 10 OS. I recommend you can post your thread in the forum below:
https://social.technet.microsoft.com/Forums/en-US/home?category=WinPreview2014
Best Wishes!
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place. <br/> Click <a
href="http://support.microsoft.com/common/survey.aspx?showpage=1&scid=sw%3Ben%3B3559&theme=tech"> HERE</a> to participate the survey.

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Pls. go through the docu..
CALL FUNCTION
Variant 5
CALL FUNCTION func IN BACKGROUND TASK.
Additions:
1. ... AS SEPARATE UNIT
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Addition 4
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      FORM READ_CUSTITAB                                   *
FORM READ_CUSTITAB.
WRITE: / 'System ID:', SY-SYSID.
SKIP.
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ULINE.
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Pls. reward if useful....

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Check this link.
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at Microsoft.VisualStudio.Services.WebApi.HttpClientExtensions.<DownloadFileFromTfsAsync>d__2.MoveNext()
Inner Exception Details:
Exception Message: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. (type WebException)Exception Stack Trace: at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
Inner Exception Details:
Exception Message: The remote certificate is invalid according to the validation procedure. (type AuthenticationException)
Exception Stack Trace: at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)

Hi Mitul,
Thanks for your reply.
It’s strange, if your old build definitions can work using the same TFS Build Server, that indicate your TFS Server configuration is correct and can works. But only new build definition with default TfvcTemplate.12.xaml template cannot build successful.
Please share your TFS Server detailed environment information here. And share your
Build Service Properties dialog screenshot here.
Try to clean the Cache for TFS 2013 manually(delete the content of the folder only, not the cache folder itself):
Clean the Cache folder on Server machine. The folder path is:
C:\Program Files\Microsoft Team Foundation Server 12.0\Application Tier\Web Services\_tfs_data.
After cleaned, on Server machine, click Start and select
Run… to open the dialog box, then input iisreset.exe and click OK, wait it run completely.
Additionally, you can run the TFS 2013 Power Tools BPA to scan the installation of your TFS Server.
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.

About the error: "The account is not authorized to login from this station" when you access NAS devices from Windows 10 Technical Preview (build 9926)

Scenario:
With the release of Windows 10 Technical Preview (build 9926), some users may encounter an error message of “The account is not authorized to login from this station” when trying to access remote files saved in NAS storage. In
addition, the following error log may also be found via Event Viewer:
Rejected an insecure guest logon.
This event indicates that the server attempted to log the user on as an unauthenticated guest but was denied by the client. Guest logons do not support standard security features such as signing and encryption. As a result,
guest logons are vulnerable to man-in-the-middle attacks that can expose sensitive data on the network. Windows disables insecure guest logons by default. Microsoft does not recommend enabling insecure guest logons.
Background:
The error message is due to a change we made in Windows 10 Technical Preview (build 9926) which is related to security and remote file access that may affect you.
Previously, remote file access includes a way of connecting to a file server without a username and password, which was termed as “guest access”.
With guest access authentication, the user does not need to send a user name or password.
The security change is intended to address a weakness when using guest access. While the server may be fine not distinguishing among clients for files (and, you can imagine in the home scenario that it doesn’t
matter to you which of your family members is looking at the shared folder of pictures from your last vacation), this can actually put you at risk elsewhere. Without an account and password, the client doesn’t end up with a secure connection to the server.
A malicious server can put itself in the middle (also known as the Man-In-The-Middle attack), and trick the client into sending files or accepting malicious data. This is not necessarily a big concern in your home, but can be an issue when you take your
laptop to your local coffee shop and someone there is lurking, ready to compromise your automatic connections to a server that you can’t verify. Or when your child goes back to the dorm at the university. The change we made removes the ability to connect
to NAS devices with guest access, but the error message which is shown in build 9926 does not clearly explain what happened. We are working on a better experience for the final product which will help people who are in this situation.
As a Windows Insider you’re seeing our work in progress; we’re sorry for any inconvenience it may have caused.
Suggestion:
You may see some workarounds (eg. making a registry change restores your ability to connect with guest access).
We do NOT recommend making that change as it leaves you vulnerable to the kinds of attacks this change was meant to protect you from.
The recommended solution is to add an explicit account and password on your NAS device, and use that for the connections. It is a one-time inconvenience,
but the long term benefits are worthwhile. If you are having trouble configuring your system, send us your feedback via the Feedback App and post your information here so we can document additional affected scenarios.
Alex Zhao
TechNet Community Support

Hi RPMM,
Homegroup works great in Windows 10 Technical Preview (9926 build), when I invited my Windows 10 Technical Preview (9926 build) joined in HomeGroup, I can access the shares smoothly:
My shares settings is like this:
Alex Zhao
TechNet Community Support

Background Task Error 0x80270257 in Win10 TP build 9926

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