You need to put the .cgi extension--it's not assumed. exec runs another program on your *filesystem*. So you may also have to use the full path to manager.cgi. 
    exec '/full/path/to/manager.cgi'
        or dienice("Could not run manager");

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In reply to Re: running exec script.cgi from a cgi script by btrott
in thread running exec script.cgi from a cgi script by Anonymous Monk

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