The other day, I noticed something strange with Windows 7’s runas.exe command.
When I specify a local user, a local administrator for instance, I normally use the “period-notation”, like: .UserName
However, RUNAS.EXE threw an error at me: “RUNAS ERROR: Unable to acquire user password”.
Luckily, this was easily solved.
I quickly found, that if I replaced the period (.) with the computer name, the command worked as expected. See here a screenshot of the error, and the version that works.