login to winbox using dynamic-ip "or ddns" error

Hi,…
i was trying to connect my modem “which using dynamic-ip” from the internet
so i created changeip.com’s account and tried to connect to the modem configuration using it,.. and it’s worked

now i want to use that domain to login to winbox,… but the winbox shows the error
“Routeros error: Couldn’t fetch index from [ip]:80: not implemented”

so i tried to log in with the dynamic ip itself without the domain but the same error

how can i login winbox using modem dynamic-ip?

my ip and interfaces

/ip firewall export
# feb/17/2012 16:38:43 by RouterOS 3.30
# software id = SN4X-Z7VQ
#
/ip firewall connection tracking
set enabled=yes generic-timeout=10m icmp-timeout=10s tcp-close-timeout=10s \
    tcp-close-wait-timeout=10s tcp-established-timeout=1d \
    tcp-fin-wait-timeout=10s tcp-last-ack-timeout=10s \
    tcp-syn-received-timeout=5s tcp-syn-sent-timeout=5s tcp-syncookie=no \
    tcp-time-wait-timeout=10s udp-stream-timeout=3m udp-timeout=10s
/ip firewall filter
add action=passthrough chain=unused-hs-chain comment=\
    "place hotspot rules here" disabled=yes
add action=passthrough chain=unused-hs-chain comment=\
    "place hotspot rules here" disabled=yes
/ip firewall nat
add action=passthrough chain=unused-hs-chain comment=\
    "place hotspot rules here" disabled=yes
add action=masquerade chain=srcnat comment="masquerade hotspot network" \
    disabled=no src-address=192.168.1.0/24
/ip firewall service-port
set ftp disabled=no ports=21
set tftp disabled=no ports=69
set irc disabled=no ports=6667
set h323 disabled=no
set sip disabled=no ports=5060,5061
set pptp disabled=no



 /ip service> print
Flags: X - disabled, I - invalid 
 #   NAME                  PORT  ADDRESS            CERTIFICATE                
 0   telnet                23    0.0.0.0/0         
 1   ftp                   21    0.0.0.0/0         
 2   www                   80    0.0.0.0/0         
 3   ssh                   22    0.0.0.0/0         
 4 X www-ssl               443   0.0.0.0/0          none                       
 5 X api                   8728  0.0.0.0/0         
 6   winbox                8291  0.0.0.0/0