RE: CreateProcessAsUser fails with ERROR_PIPE_NOT_CONNECTED

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Hello Yuri Martsinovsky,

Good morning Yuri Martsinovsky, welcome to
microsoft.public.win32.programmer.kernel NewsGroup. I am Rongchun
Zhang[MSFT], it is my pleasure to work with you on this issue.

First please let me describe the problem briefly. You are calling
CreateProcessAsUser() from a windows service on the WTS_SESSION_LOGON event
in order that a certain process can be started into the user's session when
he logs on. CreateProcessAsUser sometimes fails with
ERROR_PIPE_NOT_CONNECTED.

I performed the research of the case and find the a relevant issue in our
database. In that issue, it says that the problem only happens to pre-Vista
machines e.g. Windows XP (Is this the case on your side?).

=====
CAUSE

The error happens when Logon complete notification is not yet sent by
winlogon. The root cause is that, in certain environments depending on
system performance it is possible that WTS_SESSION_LOGON notification is
sent for a non-zero session before it is available for process creation.
CreateProcessAsUser() fails if you are feeding it 'winsta0\\default'
because the desktop you are targeting is not yet created.

PROCESS_INFORMATION processInfo = {0};
STARTUPINFO startupInfo;
ZeroMemory(&startupInfo, sizeof(startupInfo));
startupInfo.cb = sizeof(startupInfo);
startupInfo.lpDesktop = _T("winsta0\\default");
ccLib::CString sParams; <-- contains the full command line
CreateProcessAsUser(hNewProcessToken, NULL, sParams.GetBuffer(), NULL,
NULL, FALSE, CREATE_NEW_CONSOLE | NORMAL_PRIORITY_CLASS |
CREATE_UNICODE_ENVIRONMENT, m_pEnvironment, NULL, &startupInfo,
&processInfo);

This thread has a relevant discussion of the cause of
ERROR_PIPE_NOT_CONNECTED.
http://www.eggheadcafe.com/software/aspnet/30553990/createprocessasuser-from
aspx.

The problem is not heard to happen in Windows Vista because session 0.

=====
SOLUTION

The only solution is to wait and try again. (There is no notification sent
when desktop becomes ready.) This problem does not occur in Windows Vista
and later, therefore the product group does not plan to fix it in Windows
XP. I understand that it is not the ideal solution but this is only
workaround available.


Best regards,
Rongchun Zhang (v-rzhang@xxxxxxxxxxxxxxxxxxxx, remove 'online.')
Microsoft Online Community Support

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