Process.Start hangs on Server 2012

Question

I can find a lot of threads discussing Process.Start but none which sound like mine. The code below has been working for years on Windows Server 2003 & 2008. I'm now trying to install the same application on 2012 but although "My.exe" starts, Process.Start itself hangs - so "Started" is never logged. Can anybody suggest what the issue might be?

Many thanks in advance,

Michael

ProcessStartInfo psi = new ProcessStartInfo("C:\\My.exe");
psi.UseShellExecute = false;
psi.LoadUserProfile = false;
psi.WindowStyle = ProcessWindowStyle.Normal;
psi.ErrorDialog = false;
if (Environment.OSVersion.Version.Major >= 6) psi.Verb = "runas";
psi.Arguments = "\"MyArgs\"";
psi.RedirectStandardError = true;
psi.RedirectStandardOutput = true;
_logger.Info("Starting");
_process = Process.Start(psi);
_logger.Info("Started");

score 0 · Answer 1 · edited May 23 '17 at 12:29

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Possibly the same thing as this?

Also assuming that

"C:\My.exe"

is a typo = "C:\\My.exe" or @"C:\My.exe"

edited May 23 '17 at 12:29

Community

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answered Sep 18 '14 at 13:39

jeoffman

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10
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Sorry, yes that was a typo. – user3306282 Sep 18 '14 at 13:47
The link there, if I understand it correctly, is a problem where WaitForExit hangs. I'm not using that method and couldn't use it - as I'd need a Process object first, which I'm not getting as Process.Start never returns. – user3306282 Sep 18 '14 at 13:49
I dumped your sample into a WinForm app and ran it under a Server 2012 VM - replaced My.exe with cmd.exe and removed the Argument. The code works both as administrator and a normal user - maybe there is a problem with the "My.exe" program? – jeoffman Sep 18 '14 at 14:02

score 0 · Answer 2 · answered Sep 18 '14 at 13:51

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I believe that the "runas" verb to interactively demand administrative permissions only works when ProcessStartInfo.UseShellExecute=true, assuming that the app does run interactively and you want the use to be prompted to approve an adminstrative action. If not you might look into demanding the permissions from a manifest.

Have you tried wrapping your _process = Process.Start(psi) in a try/catch and logging any exceptions?

Have you tried dropping this code into a console app with both of the RedirectStandard ... to false to see what happens?

answered Sep 18 '14 at 13:51

Miniver Cheevy

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This application is running on a server. There is no user. The "runas" is working fine on Server 2008. – user3306282 Sep 18 '14 at 14:36
It is wrapped in try {} catch {}. There is no exception. – user3306282 Sep 18 '14 at 14:36
Dropping the RedirectStandardOuput/Error has no effect. – user3306282 Sep 18 '14 at 14:37
Low level security changes in 2008 vs 2012? Is UAC configured the same on both the server 2008 and 2012? Give the [manifest](http://msdn.microsoft.com/en-us/library/bb756929.aspx) a try. – Miniver Cheevy Sep 18 '14 at 14:59

Process.Start hangs on Server 2012

2 Answers2