Network is unreachable

when I try to get a certificate I get an error
Requesting Network is unreachable

server - ubuntu 16
installed certbot
firewall - disabled

ping - ok -

That is definitely not correct. Check your resolv.conf and /etc/hosts.

hosts has only localhost
in resolv.conf nameserver and nameserver is a Namecheap IP address. Is your server hosted at Namecheap perhaps?

It's the IP address of the Namecheap URL forwarder service.

I think OP has misinterpreted something somewhere. Perhaps try from the beginning:

curl -v

Network is unreachable

Please provide the full output. It will reveal whether the problem is your DNS resolution or whether your problem is your server’s misconfigured IPv6 interface.

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it was IPv6 problem
now all ok

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