Dear Support,

I run Ubuntu 18.10. I have installed ddclient as per https://help.ubuntu.com/community/DynamicDNS.

I have then opened the firewall:
$ sudo ufw status verbose
[sudo] password for gert:
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip

To Action From
-- ------ ----
22/tcp ALLOW IN Anywhere
80/tcp ALLOW IN Anywhere
443/tcp ALLOW IN Anywhere
80,443/tcp ALLOW IN Anywhere
80,443/tcp (Apache Full) ALLOW IN Anywhere

However, I seem unable to SSH into the PC.

Any assistance you can offer?
Best wishes
Gert Kruger

Can you share your DDClient config?

Thanks. I used the instructions at https://help.ubuntu.com/community/DynamicDNS. When I test the domain name at https://www.dynu.com/en-US/NetworkTools/DNSLookup it provides the correct internal IP address, so it seems to me the client function works.

Here is the configuration setup that I have used:

# ddclient configuration for Dynu
#
# /etc/ddclient.conf
daemon=60 # Check every 60 seconds.
syslog=yes # Log update msgs to syslog.
mail=root # Mail all msgs to root.
mail-failure=root # Mail failed update msgs to root.
pid=/var/run/ddclient.pid # Record PID in file.
use=web, web=checkip.dynu.com/, web-skip='IP Address' # Get ip from server.
server=api.dynu.com # IP update server.
protocol=dyndns2
login=myusername # Your username.
password=YOURPASSWORD # Password or MD5 of password.
MYDOMAIN.DYNU.COM # List one or more hostnames one on each line.
MYDOMAIN.COM

I figured out that the router should be set for port forwarding. I changed that as per instruction for my router.

I was able to see port 3306 (Mysql) with the "current IP" using https://www.yougetsignal.com/tools/open-ports/ is open. When I change to the domain name (huisubuntu.nl) it is closed?

Any more help?

Forgot to mention, port 22 (80, 443) for SSH is not open as well. As I indicated on the first message, my firewall is open for SSH (etc).

One more point. I have also tried removing the Firewall from the router. Ports are still all closed, both for "current internal IP" and the domain name (huisubuntu.nl).

The setup for port forwarding for my router is described at https://portforward.com/huawei/b315s-22/v2/