PHP php_network_getaddresses: getaddrinfo failed: No such host is known

Question

I am having DNS issues with a certain target domain. I am using fopen() (but same issue with other functions) to retreive an image, but I get this error: Warning: fopen(): php_network_getaddresses: getaddrinfo failed: No such host is known

I am able to ping or nslookup the domain from the command prompt, but for some reason php throws this error. When I try fopen('http://www.google.com', r); or other domains, all goes fine. But above mentioned domain simply won't resolve with PHP. I have flushed the DNS, restarted Apache, but still no luck..

I have tried with:

• Windows 7, Apache 2.2 PHP 5.3.6
• Windows server 2008r2, Apache 2.2 PHP 5.3.6

What can cause this single domain to not resolve?

Answer 1

IMO it's the different way to resolve a name from the OS and PHP.

Try:

echo gethostbyname("host.name.tld");

and

var_export (dns_get_record ( "host.name.tld") );

or

$dns=array("8.8.8.8","8.8.4.4");
var_export (dns_get_record ( "host.name.tld" ,  DNS_ALL , $dns ));

You should found some DNS/resolver error.

Answer 2

Your "localhost" cannot resolve the name www.google.com, which means your machine doesn't/can't reach a valid dns server.

Try ping google.com on the console of that machine to verify this.

Answer 3

It is more flexible to use curl instead of fopen and file_get_content for opening a webpage.

Answer 4

Your target domain might refuse to send you information. This can work as a filter based on browser agent or any other header information. This is a defense against bots, crawlers or any unwanted applications.

Answer 5

getaddrinfo failed: No such host is known

The above error is caused due to mistake in Database Host (DB_HOST) in .env file

Open the .env file and Specially check for this env variables

DB_HOST=localhost
DB_DATABASE=database_name
DB_USERNAME=database_username
DB_PASSWORD=database_password

Answer 6

I had a lot of issues with this on Windows. I just performed git clone, copied my .env.example file to .env. updated it, and executed my trusty PHP script to update initial database used for a project. And it failed, and whatever I did, it kept on failing. Out of desperation, I reinstalled MySQL, but that didn't fix things.

Finally, I figured it out. PHP script extracted the settings from .env file using file_get_contents(), and exploding it using \n, but the .env file was encoded with CRLF, so my DB_HOST was empty. After I changed the encoding of the .env file, everything was fine.

So, my point is, echo the parameters supplied to mysqli::construct, and it might be the culprit.

Answer 7

A weird thing I found was that the environment variable SYSTEMROOT must be set otherwise getaddrinfo() will fail on Windows 10.

Answer 8

What had caused this error on my side was the following line

include_once dirname(__FILE__) . './Config.php';

I managed to realize it was the culprit when i added the lines:

//error_reporting(E_ALL | E_DEPRECATED | E_STRICT);
//ini_set('display_errors', 1);

to all my php files.

To solve the path issue i canged the offending line to:

include_once dirname(__FILE__) . '/Config.php';