Nmap Development: Ncat: socket bind error on Mac OS X

[Dirk Loss <lists () dirk-loss de>]

Hi,

on Mac OS X 10.5.4 (Intel) Ncat dies with the following error when I try 
to put it into listening mode:

$ ncat -l 22222
bind: Invalid argument

Running Ncat as root, switching to UDP or disabling IPv6 in my system 
preferences did not help. I verified that there is no other process 
listing on my local TCP port 22222.

Apparently the bind() call in sys_wrap.c returns -1 and errno = 22 
(EINVAL). According to the man page [1], this means that either the 
"socket is already bound to an address and the protocol does not support 
binding to a new address" or the "socket may have been shut down."

In client mode Ncat works fine.

Any ideas what I am doing wrong or how I can help debugging?

Regards
Dirk

[1] 
http://developer.apple.com/documentation/Darwin/Reference/ManPages/man2/bind.2.html

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