How to check if the Microsoft symbol server is available, and contact them if not? - windbg

Question

When I use WinDbg command .reload /f /v ntdll.dll to download symbol from microsoft symbol server the request always fails as below:
AddImage: C:\Windows\System32\ntdll.dll DllBase = 00007ffc`27850000
Size = 001ce000 Checksum = 001ca321 TimeDateStamp = 57dcb78c
SYMSRV: BYINDEX: 0x10D
d:\symbols*http://msdl.microsoft.com/download/symbols
ntdll.pdb
70F83B45D56645FD962606D8D09AF5971 SYMSRV: d:\symbols\ntdll.pdb\70F83B45D56645FD962606D8D09AF5971\ntdll.pdb -
file not found SYMSRV: HTTPGET:
/download/symbols/ntdll.pdb/70F83B45D56645FD962606D8D09AF5971/ntdll.pdb
SYMSRV: HttpQueryInfo: 404 - HTTP_STATUS_NOT_FOUND SYMSRV: HTTPGET:
/download/symbols/ntdll.pdb/70F83B45D56645FD962606D8D09AF5971/ntdll.pd_
SYMSRV: HttpQueryInfo: 404 - HTTP_STATUS_NOT_FOUND SYMSRV: HTTPGET:
/download/symbols/ntdll.pdb/70F83B45D56645FD962606D8D09AF5971/file.ptr
SYMSRV: HttpQueryInfo: 404 - HTTP_STATUS_NOT_FOUND SYMSRV:
d:\symbols\ntdll.pdb\70F83B45D56645FD962606D8D09AF5971\ntdll.pdb not
found SYMSRV:
....symbols/ntdll.pdb/70F83B45D56645FD962606D8D09AF5971/ntdll.pdb not
found SYMSRV: BYINDEX: 0x10E
d:\symcache
ntdll.pdb
70F83B45D56645FD962606D8D09AF5971 SYMSRV: d:\symcache\ntdll.pdb\70F83B45D56645FD962606D8D09AF5971\ntdll.pdb -
file not found SYMSRV:
d:\symcache\ntdll.pdb\70F83B45D56645FD962606D8D09AF5971\ntdll.pdb not
found DBGHELP: ntdll.pdb - file not found
*** ERROR: Symbol file could not be found. Defaulted to export symbols for ntdll.dll - DBGHELP: ntdll - export symbols
************* Symbol Loading Error Summary **************
Module name Error
ntdll The system cannot find the file specified
: srv*d:\symbols*http://msdl.microsoft.com/download/symbols
The SYMSRV client failed to find a file in the UNC store, or there
is an invalid UNC store (an invalid path or the pingme.txt file is
not present in the root directory), or the file is present in the
symbol server exclusion list.
PDB not found : cache*d:\symcache
Unable to locate the .pdb file in this location
How to find out if the Microsoft symbol server is available? And if it's not available, how to contact them?

Answer 1

The official email address for reporting missing symbols is windbgfb#microsoft.com, on this page. Symbols for newly patched files are usually available within 1 week after each Patch Tuesday, so you may want to wait a few days before contacting them if the files are recently updated.
By the way, you should use https://msdl.microsoft.com/download/symbols. [1]
[1] https://learn.microsoft.com/en-us/windows/desktop/DxTechArts/debugging-with-symbols#using-the-microsoft-symbol-server

Answer 2

As you can see, the server itself is available. It's responding with a HTTP 404 code.
You can check the availability by visiting the root page or the pingme.txt file on Microsoft's server. For the latter, note that you won't see anything in the browser, because it's a 0 byte file.
If symbols are not found, the server is slow or even not responding, I see the wish of contacting Microsoft. The official email address is WinDbgFb#microsoft.com.
Another option is to tweet Andy Luhrs. He'll probably have a look at it the next working day (US based), so you'll have to wait over week ends.
There are people lurking around here on SO who have direct contact to Microsoft, e.g. Sasha Goldshtein, Brian Rasmussen, Steve Johnson and others. I guess these will notice an outage and inform Microsoft if needed. I also expect that Microsoft employees are using the symbol server themselves, so they'll probably notice that before you could report it.