Hello. In order to get ddnsclient and ispconfig addon working, I configured the client like: Code: # Configuration file for ddclient generated by debconf # /etc/ddclient.conf protocol=dyndns2 \ use=web, web=http://checkip.dyndns.org/ \ server=server.kalfaoglu.net:8080 \ login=none \ password='xxxxxxxxxxxxxxxxxxxxfd9' \ host.kalfaoglu.net and the server from https://github.com/mhofer117/ispconfig-ddns-module which I just followed its readme and eventually created a token (which I put as password= above) When the client runs, it gets the IP address correctly, but the server always responds with Error 400. Code: (.........) INFO: setting IP address to 3.14.14.26 for host.kalfaoglu.net UPDATE: updating host.kalfaoglu.net CONNECT: server.kalfaoglu.net:8080 CONNECTED: using HTTP SENDING: GET /nic/update?system=dyndns&hostname=host.kalfaoglu.net&myip=3.14.14.26 HTTP/1.1 SENDING: Host: server.kalfaoglu.net:8080 SENDING: Authorization: Basic bm9xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxk= SENDING: User-Agent: ddclient/3.10.0 SENDING: Connection: close SENDING: RECEIVE: HTTP/1.1 400 Bad Request RECEIVE: Date: Wed, 19 Feb 2025 19:22:17 GMT RECEIVE: Server: Apache RECEIVE: Content-Length: 126 RECEIVE: Connection: close RECEIVE: Content-Type: text/html; charset=iso-8859-1 RECEIVE: RECEIVE: <script>document.location.href='https://'+location.hostname+':'+location.port;</script><h1>Error 400 - trying to redirect There is nothing visible in /var/log/ispconfig/* , nothing in syslog. I'm not sure how to debug this at all. Any help would be appreciated. PS: Much of the data has been changed above for privacy.