[Mrbs-general] Authentication problem

[Stefan <ste...@gm...>]

...I trie to setup authentication using badpw.pl.

I changed "config.inc" like this:
...
# Authentication settings - read AUTHENTICATION
$auth["realm"]  = "MRBS";
$auth["type"]   = "ext";
$auth["prog"]   = "./badpw.pl";
$auth["params"] = "#USERNAME# #PASSWORD#";
...

But when I klick on Admin or anything else that needs authentication I
get an "INTERNAL SERVER ERROR 500".

What can I do to solve this problem?