Hello Patrick ,

Thank you for reaching out to the community, please refer the following steps:

To change the password for admin run 

cc passwd mynewpassword

To change the WebAdmin port to 4444, run

cc set webadmin port 4444

To confirm that "Internal (Network)" is in 'Allowed Networks' for WebAdmin:

cc get webadmin allowed_networks

That will give you one or more REF_ objects.  One of mine is REF_nuSwABYbAt

cc get_object REF_nuSwABYbAt |grep \'name

and that tells me: 'name' => 'Internal (Network)',

If 'Allowed networks' is empty, we need the REF_ for "Internal (Network)"

cc get_object_by_name 'network' 'interface_network' 'Internal (Network)'

Once you have the REF_, you can add it.  Using mine as an example (note the extra @ and + symbols - copy, paste and enter each line seprately!):

cc
webadmin
allowed_networks@
+REF_nuSwABYbAt
exit

Now, you should be able to login to web-admin as admin from the LAN.

Thank you for replying Vivek. I am able to access via lan. As I said I cannot access via hostname like example hostname..ddns.me:4444

Yes I did. What IP do I have to ping? I ping with success 192.168.10.1 <-- This ip from lan that I connect to webadmin sophos UTM.

Then I pin the hostname that I have in DynDNS section. Both show 3 packets transmitted, 0 received, 100% packet loss, time 2048ms

all above I did from my laptop.

The IP you will ping is what you have configured on Port eth6 !
example: configured IP on eth7 - 172.16.16.1 and laptop IP: 172.16.16.2 || You should be able to access https://172.16.16.1:4444
You can also reboot the web-admin service from the advance shell via following command -  /etc/init.d/httpd restart

Vivek All done with success!

Are you able to access ? is it resolved ?

It is not resolved. I can able to access webadmin ONLY via lan. like  your example above ....https://172.16.16.1:4444

Okay for the detailed troubleshooting I would request you to log a service request and revert us the case id here, will expedite the process of resolution on the service request. 

I don't speak English very well. How can I create Techincal support? I am home user.... Can I get techical support?

Do you know what is cgnat?

Vivek please don't f give up! Please help me, technical support is only for paid users.I am home user with free edition. I have this problem a lot of months..

Please help me...I don't know what can I do....

Can you share your deployment topology ?

I have a nanostation loco that takes internet via wifi then with ethernet cable connect to sophos UTM then goes the devices. Do you need more information?

I have a nanostation loco that takes internet via wifi then with ethernet cable connect to sophos UTM then goes the devices. Do you need more information?