[Pythonmac-SIG] socket code works on Win32 but not Mac :-(

[Ranec]

Dear All,

I'm writing a Python FOSS application and am *very* keen to keep it
platform agnostic.

I don't own a Mac, but have access to some sympathetic Mac owners. :-)

The following code works just fine under Windows XP and Vista but not on
MacOS X (currently no idea what version, though Python is 2.5.?). Any
thoughts?

def get_my_ip_address():
    ret=None
    try:
        s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(('google.com', 0))
        sn=s.getsockname()
        if sn:
            ret=sn[0]
    except socket.error, e:
        hn=socket.gethostname()
        ret=socket.gethostbyname(hn)
    return ret

produces the stack:

Traceback (most recent call last):
  File "./sarnie_client.py", line 181, in get_my_ip_address
    s.connect(('google.com', 0))
  File "<string>", line 1, in connect
socket.error: (49, "Can't assign requested address")

My application has been given firewall rights accept connections from
the Internet. Is there perhaps anything else that I should configure?

TIA

-R