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Hi,

Just checked this on my solaris 9 box:

Python 2.3.3 (#1, Apr 12 2004, 21:32:46) 
[GCC 2.95.3 20010315 (release)] on sunos5
Type "help", "copyright", "credits" or "license" for more
information.
>>> 
>>> 
>>> import socket
>>> print socket.ntohs(-1)
65535


It looks fine. what system are you running on when doing
this test. 
Most likely can be a bug and needs a patch. You can always
check the release number as:

cat /etc/release

Cheers
Stefan Parvu