Running service nginx configtest on a LEMP-system (ubuntu 12.04 LTS) gives a [fail]. However, i've no clue why .. Is there a way to debug the parameter configtest or is there somewhere al log-file?

It should tell you on the commandline or in the error.log

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nginx for Windows http://nginx-win.ecsds.eu/

No, the CLI is empty .. :-? Can't figure out why.
O wait, i moved the error log to \var\log\nginx. What's in it?

And .. found it. I had one 'real' but misconfigured config-file in the \sites-enabled\-folder, instead of just symlinks to \sites-available\. So that's why i couldn't find it in the config-files. I thought, they where all in the \sites-available\, but there was one more ..