[UWP] Symbols for ntdll.dll could not be downloaded from Microsoft Symbol Servers when setting UWP app to Release mode in .net 2015

Question

Hi,

I need to "debug" my UWP app in Release mode in .net 2015 but when I do I get the following error:

"Symbols for ntdll.dll could not be downloaded from Microsoft Symbol Servers."

• I've downloaded the symbols file that was released (today I believe) for x86 (Retail) from Download Windows Symbol Packages and installed them in c:\symbols

• I've added '_NT_SYMBOL_PATH' to the System variables in the "Environment Variable" dialog and set it to "c:\symbols"

• When I open Tools|Options|Debugging|Symbols, I see the new '_NT_SYMBOL_PATH' in the 'Symbol file location(s)'. I select both the '_NT_SYMBOL_PATH' and the 'Microsoft Symbols Servers' and the error still occurs. I've also tried to add the folder 'c:\symbols' to that 'Symbol file location(s)' list but still no luck.

What am I missing? I've spent hours trying to resolve this problem and I still haven't got anywhere with it.

I need to get this resolved as soon as possible, so any help would be greatly appreciated.

Thanks.

Answer 1

Hello tfierens,

From your description, this question is related with the Debug in Visual Studio, I would move it to the debug support forum.

Regards.

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Answer 2

Hi tfierens,

It seems that other members also got this issue before:

http://stackoverflow.com/questions/35979342/symbols-for-ntdll-dll-could-not-be-downloaded-from-microsoft-symbol-servers

Please debug it again in your side.

Of course, please also make sure that it is not the network issue, for example, maybe you could test it in other VS machine, debug it again.

Best Regards,

Jack

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Answer 3

Hi Jack,

I appreciate the response, but if you look at the link you provided me, you'll clearly see that I'm already heavily involved with another user on this thread and I've yet to come up with a solution.

Regarding the network connectivity, it is definitely not the issue as a) I'm 100% sure I'm connected on my SP3 and b) my web browser on my WP10 emulator is accessing web pages via Edge.

I don't have any other machines to test it on. Sorry.

Do you have any other suggestions. This is actually driving me mad as I haven't had a chance to look at this until now and I'm still unable to debug my app when in "Release" mode on the WP10 emulator. Note that this problem does not occur when running in "Release" mode as a Windows Store App.

Thanks.

Thierry

Answer 4

Hi tfierens,

Thanks for your friendly response.

If possible, please change the platform target(X64/X86), check it again.

It seems that other members also got this issue:

https://social.msdn.microsoft.com/Forums/vstudio/en-US/fbbd1163-c4aa-440c-9156-94d96ed6bf7f/uwpsymbols-for-ntdlldll-could-not-be-downloaded-from-microsoft-symbol-servers?forum=visualstudiogeneral

Even if some members say that this issue has been resolve from 2016/3/16. I feel that it would be a real issue.

To get the issue confirmed and diagnose by product team, would you please create connect report for it? You will get email notification for update.http://connect.microsoft.com/VisualStudio/feedback/CreateFeedback.aspx

If you submit it, please share me the link here, so we could get the latest information from the product team. In addition, if possible, you could share a simple sample in your connect report, so it would be helpful for the report team experts to really repro and troubleshoot this issue, I will also download and repro it in my side.

If there's any concern, please feel free to let me know.

Sincerely,

Jack

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