B.R. wrote:
> ​What​ could be the problem? How should I investigate this?

Just guessing...

In your nginx configuration are you specifying a resolver that is
different or unavailable?

  http://nginx.org/en/docs/http/ngx_http_core_module.html#resolver

Another guess but likely installing a local caching nameserver I think
would work around the problem, using 'nameserver 127.0.0.1' in the
/etc/resolv.conf file.

  apt-get install bind9

What version of debian are you running?

  cat /etc/debian_version

Bob

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