Description of problem:
When a UDP port is scanned with netcat (nc) on a remote IP address, nc always
returns success.

Version-Release number of selected component (if applicable):
1.78-2

How reproducible:
Always.

Steps to Reproduce:
1. Run "nc -uz IP port"
2. Run "echo $?"
  
Actual results:
Returns 0 (success).

Expected results:
Should return 1

Additional info:

On xen2 box:
==============================================
[root@xen2 ~]# ping -c 1 xen1
PING xen1.test.det.nsw.edu.au (192.168.20.1) 56(84) bytes of data.
64 bytes from xen1.test.det.nsw.edu.au (192.168.20.1): icmp_seq=0 ttl=64
time=0.109 ms

--- xen1.test.det.nsw.edu.au ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.109/0.109/0.109/0.000 ms, pipe 2
[root@xen2 ~]# nc -uz xen1 4005
Connection to xen1 4005 port [udp/*] succeeded!
[root@xen2 ~]# echo $?
0
[root@xen2 ~]# nc -uz 192.168.20.1 4005
Connection to 192.168.20.1 4005 port [udp/*] succeeded!
[root@xen2 ~]# echo $?
0
==============================================

On xen1 box:
==============================================
[root@xen1 ~]# netstat -an | grep 4005
[root@xen1 ~]# nc -uz 192.168.20.1 4005
[root@xen1 ~]# echo $?
1
[root@xen1 ~]# nc -uz xen1 4005
[root@xen1 ~]# echo $?
1
==============================================

BTW, xen1 and xen2 are connected via a private interconnect. All is good when
scanning TCP ports.