Hello Michael,

after change to DynDNS class I got the following "DDNSUpdateError"
Nov 28 13:42:17 minusrouter ddns[23192]: Dynamic DNS update for ovpn.XXXXX.YYY (dynamicdns.key-systems.net) failed:
Nov 28 13:42:17 minusrouter ddns[23192]:   DDNSUpdateError: The update could not be performed
Nov 28 13:42:17 minusrouter ddns[23192]:   Server response: [RESPONSE] code = 200 description = Command completed successfully queuetime = 0 runtime = 0.058 EOF

The DynDNS2 code (generating the ERROR):

class DDNSProviderKEYSYSTEMS(DDNSProtocolDynDNS2, DDNSProvider):
        handle    = "dynamicdns.key-systems.net"
        name      = "dynamicdns.key-systems.net"
        website   = "https://domaindiscount24.com/"
        #protocols = ("ipv4",)

        # There are only information provided by the domaindiscount24 how to
        # perform an update with HTTP APIs
        # https://www.domaindiscount24.com/faq/dynamic-dns
        # examples: https://dynamicdns.key-systems.net/update.php?hostname=hostname&password=password&ip=auto
        #           https://dynamicdns.key-systems.net/update.php?hostname=hostname&password=password&ip=213.x.x.x&mx=213.x.x.x

        url = "https://dynamicdns.key-systems.net/update.php"

        def prepare_request_data(self, proto):
                address = self.get_address(proto)
                data = {
                        "hostname"      : self.hostname,
                        "password"      : self.password,
                        "ip"            : address,
                        "mx"            : address,
                }

                return data

The server response to a simple wget request was:
[RESPONSE]
code = 200
description = Command completed successfully
queuetime = 0
runtime = 0.053
EOF


The working code:

class DDNSProviderKEYSYSTEMS(DDNSProvider):
        handle    = "dynamicdns.key-systems.net"
        name      = "dynamicdns.key-systems.net"
        website   = "https://domaindiscount24.com/"
        protocols = ("ipv4",)

        # There are only information provided by the domaindiscount24 how to
        # perform an update with HTTP APIs
        # https://www.domaindiscount24.com/faq/dynamic-dns
        # examples: https://dynamicdns.key-systems.net/update.php?hostname=hostname&password=password&ip=auto
        #           https://dynamicdns.key-systems.net/update.php?hostname=hostname&password=password&ip=213.x.x.x&mx=213.x.x.x

        url = "https://dynamicdns.key-systems.net/update.php"
        can_remove_records = False

        #def prepare_request_data(self, proto):
        def update_protocol(self, proto):
                address = self.get_address(proto)
                data = {
                        "hostname"      : self.hostname,
                        "password"      : self.password,
                        "ip"            : address,
                        "mx"            : address,
                }

                # Send update to the server.
                response = self.send_request(self.url, data=data)

                # Handle success messages.
                if response.code == 200:
                        return

                # If we got here, some other update error happened.
                raise DDNSUpdateError

                #return data

Unfortunately this provider has no list of any possible responses - or maybe I have overlooked it. That can however be tested to check if those are still compatible with DynDNS.
I couldn't find any more pointers on the providers page either, and for that testing I would have to dig in too deep (into the code and the protocols) for me to handle at the moment. (maybe next week/month).

best
Christof

On 28/11/2019 12:20, Michael Tremer wrote: