Penetration Testing: THC-Hydra web form attack

[Application Tester <vul.tester () gmail com>]

Hi all,

How to do a web form attack from command line hydra. I have a webmail 
(/webmail/src/login.php) to crack passwords as part of my PT.
I have tried the following but failed.

hydra -l username -P dictionary.txt  -o output.txt -t 4  
mydomainname.com  http-post-form -m /webmail/src/login.php
Hydra (http://www.thc.org) starting at 2008-05-20 11:53:41
[DATA] 4 tasks, 1 servers, 213560 login tries (l:1/p:213560), ~53390 
tries per task
[DATA] attacking service http-post-form on port 80
select: Bad file descriptor

Please advice.

Regards.
Vul Tester.


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