# No-IP automatic Dynamic DNS update
#
#--------------- Change Values in this section to match your setup ------------------

# No-IP User account info
:local noipuser "your_no-ip_user"
:local noippass "your_no-ip_pass"

# Set the hostname or label of network to be updated.
# Hostnames with spaces are unsupported. Replace the value in the quotations below with your host names.
# To specify multiple hosts, separate them with commas.
:local noiphost "hostname.no-ip.net"

# Change to the name of interface that gets the dynamic IP address
:local inetinterface "your_external_interface"

#------------------------------------------------------------------------------------
# No more changes need

:local previousIP

if ( [:len [/file find name=("no-ip_ddns_previousip.txt")]] > 0 ) do={
:set previousIP [/file get ("no-ip_ddns_previousip.txt") contents]
}


:if ([/interface get $inetinterface value-name=running]) do={
# Get the current IP on the interface
:local currentIP [/ip address get [find interface="$inetinterface" disabled=no] address]

# Strip the net mask off the IP address
:for i from=( [:len $currentIP] - 1) to=0 do={
:if ( [:pick $currentIP $i] = "/") do={
:set currentIP [:pick $currentIP 0 $i]
}
}

:if ($currentIP != $previousIP) do={
:log info "No-IP: Current IP ($currentIP) is not equal to previous IP ($previousIP), update needed"

# The update URL. Note the "\3F" is hex for question mark (?). Required since ? is a special character in commands.
:local url "http://dynupdate.no-ip.com/nic/update\3Fmyip=$currentIP"
:local noiphostarray
:set noiphostarray [:toarray $noiphost]
:foreach host in=$noiphostarray do={
:log info "No-IP: Sending update for $host"
/tool fetch url=($url . "&hostname=$host") user=$noipuser password=$noippass mode=http dst-path=("no-ip_ddns_update-" . $host . ".txt")
:log info "No-IP: Host $host updated on No-IP with IP $currentIP"
/file print file=("no-ip_ddns_previousip.txt")
:delay 3
/file set contents="$currentIP" ("no-ip_ddns_previousip.txt")
}
} else={
:log info "No-IP: Previous IP $previousIP is equal to current IP, no update needed"
}
} else={
:log info "No-IP: $inetinterface is not currently running, so therefore will not update."
}

in the file it says nohost.

then i thought maybe i should manually put 1.1.1.1 in there and see how it works. no luck still.

then i triple checked user/pass are correct.

then i delete the host.txt file. and something interesting happened. it does not create this host txt file any more.

You need to add a Firewall rules:

"input"
"tcp (6)"
"dst port" : Your http/https port.
"allow"