最新重新安装win10 1903 然后更新了最新的12月补丁，然后用windbg调试驱动调试三环，甚至在win7 虚拟机里面也无法下载符号了
0:000> .reload
Reloading current modules
.....
SYMSRV: BYINDEX: 0x4
e:\symbols*https://msdl.microsoft.com/download/symbols
ntdll.pdb
0C2E19EA1901E9B82E4567D2D21E56D21
SYMSRV: UNC: e:\symbols\ntdll.pdb\0C2E19EA1901E9B82E4567D2D21E56D21\ntdll.pdb - path not found
SYMSRV: UNC: e:\symbols\ntdll.pdb\0C2E19EA1901E9B82E4567D2D21E56D21\ntdll.pd_ - path not found
SYMSRV: UNC: e:\symbols\ntdll.pdb\0C2E19EA1901E9B82E4567D2D21E56D21\file.ptr - path not found
SYMSRV: HTTPGET: /download/symbols/ntdll.pdb/0C2E19EA1901E9B82E4567D2D21E56D21/ntdll.pdb
SYMSRV: HttpSendRequest: 800C2EFF - ERROR_INTERNET_CONNECTION_RESET
SYMSRV: RESULT: 0x800C2EFF
DBGHELP: C:\Windows\SYSTEM32\ntdll.pdb - file 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
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.
