Is there a software firewall on the host? Is the Ubuntu install a physical machine or a virtual server?
physical machine, i disabled all firewalls
Have you confirmed that the noip domain currently points to the correct IP address? If you can visit https://www.whatismyip.com from the same network as the server, you can compare that with the result when looking up the domain name at DNS Lookup - WhatIsMyIP.com®
yes i confirmed. but ping (ping (domian)) gives no output
Your ISP might be blocking ports and ICMP.
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alredy fixed thanks for all your help
And how did you solve it?
just i installed development verision that is running on ip adress
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You don’t want to run the development version on a public ip. Lots of security is turned off. For example, you can log in as any user without a password.
please, someone send me instructions to set up discourse on noip hostname 
Why do you need it on noip? You can use cloudflare tunnels instead which is much better.
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because i don’t wanna pay
ok, how to do it ?
Follow the instructions.
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is there any other solution? i don’t want to give my credit card number to cloudflare.
No, there’s no other official solution. You’re on your own
Edit: Discourse is a Free & Open-Source software which you can host yourself without having to pay for any upfront purchase of license etc.
However, You still have to pay for a domain name, hosting, email etc. These costs can not be avoided.
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ok, then when i use “tunnels” do i need domain name or can it be from noip?
You’ll need a FQDN that is supported by cloudflare. They support most domains except for a few free ones (e.g. .tk)
May I ask why? Cloudflare is a very reputable company, and as @itsbhanusharma has already said, it’s free. You won’t be charged for anything. Is it because Cloudflare has yet to pull out of Russia? You don’t have to answer me, but I’m quite confused… 
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