psexec on Windows Server 2008 with -s flag: login failure

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http://serverfault.com – I'm trying to use psexec.exe to run batch scripts on Windows Server 2008. I cannot use plaintext passwords, so I'm using the "-s" flag, and not providing a username/password. I get the following error: Logon failure: unknown user name or bad password. The command I'm running is: > "E:\Deploy\psexec" \\whichever-server.com cmd /c net stop "MyService" Now, this exact process works fine on our old Windows Server 2003 servers, but we're being forced to migrate. I've been reading up on psexec.exe documentation the past day and so far have seen nothing that could point to the cause of t (HowTos)