Your statement is correct, but the cli command does not return any address. If it would return multiple, I could select the correct one (in this use case that would be strange) . But it returns nothing for any interface. It did work until 7.12
So the questions is: what is the solution…
With the latest versions of RouterOS the “fetch” command does not work https anymore.
Try this: (Something similar happened to me with a script)
/tool fetch mode=https \
# change to:
/tool fetch mode=http \
Hi folks,
looks like that Router OS 7.14beta4 fixes that bug:
https://mikrotik.com/download/changelogs/testing-release-tree
anybody already able to test?
BR and happy new year to all
False… and define what is “latest versions” for you.
[vmtest@] > :put ([/tool fetch url=“https://upgrade.mikrotik.com/routeros/NEWESTa7.stable” as-value output=user]->“data”)
7.13 1702545848
The script is bad implemented at the start, if it just download from one “url” is not needed any mode/src/etc. frills
And at the time I write, http**s**://checkip.dyndns.org/ do not work at all, not even on other systems
Kitty has claws, do not mess with it, even with only one eye open you will get hurt, thinking your script knowledge is somehow better, such a comedian. You do know that cat is just Yoda in disguise.
uff I can't get used to those manners 
but I like him...
My answer is based on my own experience (when switching to 7.13) and that's why I wanted to help, nothing more. At the time it didn't work with "mode=https" and switching to http fixed it. Now users report that with the latest beta it is fixed.
*) fetch - fixed fetch when using "src-path" with HTTP/HTTPS modes (introduced in v7.13);
Happy new year and please, it doesn't cost work to be a little kind.
It probably depends on the fact that I am NOT a native English speaker and I don’t use automatic translators… 
At least if I make a mistake it’s my fault…
And in any case, whether or not it seems like an offense, at least compared to others (not present in this topic so far) at least I try to explain my reasons…
Please try to understand my previous sentences…
Happy Birthday to You too! And to the Others!
Why use mode or any other param that is part of url like address, port and src-path for http(s) fetch? Url as single argument is enough, url schema sets mode if not set and other params are all part of url.
This is a tested and working script if anyone looking for a solution:
Tested on Mikrotik RouterOS: 7.12.1
# Set needed variables
:global username "your-login-name"
:global password "your-password"
:global hostname "your-dyndns"
:global dyndnsForce
:global previousIP
# print some debug info
:log info ("UpdateDynDNS: username = $username")
:log info ("UpdateDynDNS: password = $password")
:log info ("UpdateDynDNS: hostname = $hostname")
:log info ("UpdateDynDNS: previousIP = $previousIP")
# get the current IP address from the internet (in case of double-nat)
/tool fetch mode=http address="checkip.dyndns.org" src-path="/" dst-path="/dyndns.checkip.html"
:delay 1
:local result [/file get dyndns.checkip.html contents]
# parse the current IP result
:local resultLen [:len $result]
:local startLoc [:find $result ": " -1]
:set startLoc ($startLoc + 2)
:local endLoc [:find $result "</body>" -1]
:local currentIP [:pick $result $startLoc $endLoc]
:log info "UpdateDynDNS: currentIP = $currentIP"
# Remove the # on next line to force an update every single time - useful for debugging,
# but you could end up getting blacklisted by DynDNS!
#:set dyndnsForce true
# Determine if dyndns update is needed
# more dyndns updater request details http://www.dyndns.com/developers/specs/syntax.html
:if (($currentIP != $previousIP) || ($dyndnsForce = true)) do={
:set dyndnsForce false
:set previousIP $currentIP
:log info "$currentIP or $previousIP"
/tool fetch user=$username password=$password mode=https address="members.dyndns.org" \
src-path="nic/update?system=dyndns&hostname=$hostname&myip=$currentIP&wildcard=no" \
dst-path="/dyndns.txt"
:delay 1
:local result [/file get dyndns.txt contents]
:log info ("UpdateDynDNS: Dyndns update needed")
:log info ("UpdateDynDNS: Dyndns Update Result: ".$result)
:put ("Dyndns Update Result: ".$result)
} else={
:log info ("UpdateDynDNS: No dyndns update needed")
}
I have two nic(S)/WAN. how can i define failover nic in this script?
Hi there, quite new to Mikrotik. Tried utilizing tdeak’s script but for some reason the new IP does not get updated on dyndns side, at the end of the log I get this error code:
“…to dyndns.txt FAILED: Fetch failed with status 400”
Not sure if anyone can help. I am on ROS 7.13. Tried interchanging https with http with fetch tool to no avail, still keep getting the same error.
Thank you ever so much for any advise.
Hi, I want to do AutoUpdate Port Forwarding IP Public Dynamic (dyndns.com) with Mikrotik.
Does anyone have the script?
I did WebManage 3CX PBX IP port forwarding, but Destination-Address (dst-address) cannot autoupdate public ip from DialUp PPPoE.
NB: i am using RB750 V.6.49.15
Thank you very much for your advice.
Hi everyone
We have multiple customer installation with mikrotik’s router and an dynamic host on its public IP; mikrotik should update the host using DYNDNS services.
We used the “first version” of the script, this:
# Set needed variables
:local username "user"
:local password "password"
:local hostname "host"
:global dyndnsForce
:global previousIP
# print some debug info
:log info ("UpdateDynDNS: username = $username")
:log info ("UpdateDynDNS: password = $password")
:log info ("UpdateDynDNS: hostname = $hostname")
:log info ("UpdateDynDNS: previousIP = $previousIP")
# get the current IP address from the internet (in case of double-nat)
/tool fetch mode=http address="checkip.dyndns.org" src-path="/" dst-path="/dyndns.checkip.html"
:delay 1
:local result [/file get dyndns.checkip.html contents]
# parse the current IP result
:local resultLen [:len $result]
:local startLoc [:find $result ": " -1]
:set startLoc ($startLoc + 2)
:local endLoc [:find $result "</body>" -1]
:local currentIP [:pick $result $startLoc $endLoc]
:log info "UpdateDynDNS: currentIP = $currentIP"
# Remove the # on next line to force an update every single time - useful for debugging,
# but you could end up getting blacklisted by DynDNS!
:set dyndnsForce true
# Determine if dyndns update is needed
# more dyndns updater request details http://www.dyndns.com/developers/specs/syntax.html
:if (($currentIP != $previousIP) || ($dyndnsForce = true)) do={
:set dyndnsForce false
:set previousIP $currentIP
:log info "$currentIP or $previousIP"
/tool fetch user=$username password=$password mode=http address="members.dyndns.org" \
src-path="nic/update?system=dyndns&hostname=$hostname&myip=$currentIP&wildcard=no" \
dst-path="/dyndns.txt"
:delay 1
:local result [/file get dyndns.txt contents]
:log info ("UpdateDynDNS: Dyndns update needed")
:log info ("UpdateDynDNS: Dyndns Update Result: ".$result)
:put ("Dyndns Update Result: ".$result)
} else={
:log info ("UpdateDynDNS: No dyndns update needed")
}
for a long time it works great, but now are experiencing problems; in the log files we can see errors:
So we just tried to use the new script:
# Set needed variables
:global username "your-login-name"
:global password "your-password"
:global hostname "your-dyndns"
:global dyndnsForce
:global previousIP
# print some debug info
:log info ("UpdateDynDNS: username = $username")
:log info ("UpdateDynDNS: password = $password")
:log info ("UpdateDynDNS: hostname = $hostname")
:log info ("UpdateDynDNS: previousIP = $previousIP")
# get the current IP address from the internet (in case of double-nat)
/tool fetch mode=http address="checkip.dyndns.org" src-path="/" dst-path="/dyndns.checkip.html"
:delay 1
:local result [/file get dyndns.checkip.html contents]
# parse the current IP result
:local resultLen [:len $result]
:local startLoc [:find $result ": " -1]
:set startLoc ($startLoc + 2)
:local endLoc [:find $result "</body>" -1]
:local currentIP [:pick $result $startLoc $endLoc]
:log info "UpdateDynDNS: currentIP = $currentIP"
# Remove the # on next line to force an update every single time - useful for debugging,
# but you could end up getting blacklisted by DynDNS!
#:set dyndnsForce true
# Determine if dyndns update is needed
# more dyndns updater request details http://www.dyndns.com/developers/specs/syntax.html
:if (($currentIP != $previousIP) || ($dyndnsForce = true)) do={
:set dyndnsForce false
:set previousIP $currentIP
:log info "$currentIP or $previousIP"
/tool fetch user=$username password=$password mode=https address="members.dyndns.org" \
src-path="nic/update?system=dyndns&hostname=$hostname&myip=$currentIP&wildcard=no" \
dst-path="/dyndns.txt"
:delay 1
:local result [/file get dyndns.txt contents]
:log info ("UpdateDynDNS: Dyndns update needed")
:log info ("UpdateDynDNS: Dyndns Update Result: ".$result)
:put ("Dyndns Update Result: ".$result)
} else={
:log info ("UpdateDynDNS: No dyndns update needed")
}
but also this script log some errors:
the most strange things is that sometimes works, and sometimes not…We are using ROS 7.15.3 in all devices; does anyone have an a idea how to solve this?
Thanks
bye
Please, someone can help us?
I've got the same problem, have you got any solution? Using ROS 7.19.4
I use a different script, but same core approach and have the same problem.
The failure (and resulting errors) happens at what seems to be random times.
I've been ignoring it, but my guess is it has something to do with whether there is or is not an updated (i.e., changed) IP address. But, it could be as simple as their service not always being reachable.
These are samples from my log:
This is the script I use:
:local username "<MYNAME>"
:local clientkey "<MYCLIENTKEY>"
:local hostname "<MYHOSTNAME>.dyndns.org"
:global dyndnsForce
:global previousIP
:local idName [/system identity get name]
:local result ([/tool fetch url="http://checkip.dyndns.org/dyndns.checkip.html" output=user as-value]->"data")
:local currentIP [:pick $result ([:find $result ": " -1] + 2) [:find $result "</body>" -1]]
# if undefined... define...
:if ($dyndnsForce != false) do={ :log warning "UpdateDynDNS: Forced update on" }
:if (($currentIP != $previousIP) or ($dyndnsForce != false)) do={
:log info "UpdateDynDNS: previousIP = $previousIP ; currentIP = $currentIP"
:set dyndnsForce false
:set previousIP $currentIP
/file remove [find where name="dyndns.txt"]
/tool fetch url="https://$username:$clientkey@members.dyndns.org/v3/update\3Fhostname=$hostname&myip=$currentIP" dst-path="dyndns.txt"
:set result [/file get "dyndns.txt" contents]
/tool fetch upload=yes mode=ftp ascii=no address=192.168.2.22 port=21 user=mikrotik password=mikrotik \
src-path="dyndns.txt" dst-path="/mikrotik-backups/$idName\2DIP.txt"
/file remove [find where name="dyndns.txt"]
:log info "UpdateDynDNS: Dyndns Update Result: $result"
} else={ :log info "UpdateDynDNS: No dyndns update needed" }
I do not see any "line 32" on that script...
Do not alter the sources if you want support...
The only changes I made are where I hid the username, clientkey, and hostname values.
No other changes by me.
Anyway, I've already seen that script somewhere... 
Yes, it was indeed expertly crafted.