hi, when i enter noip domain to discourse setup i get: port 443 of computer does not appear to be accessable using hostname.
when i ping that noip domain there is no response
Are you trying to host Discourse on a domestic internet connection?
Does the router/firewall have port 443 opened and forwarded to the machine where Discourse will be installed.
yes, port 443 is opened
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
Cloudflare tunnels is free
ref: https://blog.cloudflare.com/tunnel-for-everyone/
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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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