Why does PHP curl returns error 6 for one website?

Question

I'm trying to access www.alberta.ca/ with PHP curl but it returns "Curl failed with error #6: Could not resolve host", although the website is online and returns a nice 200.

Here is my code:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://www.alberta.ca/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$content = curl_exec($ch);

I tried all the solutions I could find, for example adding the following options:

curl_setopt($ch, CURLOPT_DNS_USE_GLOBAL_CACHE, false );
curl_setopt($ch, CURLOPT_DNS_CACHE_TIMEOUT, 2 );
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);

But nothing works. Strangely, it works from my localhost, but not from my server.

You should talk to the server admin. They are in the best position to figure out what problem there might be with the local DNS provider resolving that host name. — CBroe, Jun 08 '23 at 10:45
Can you use the curl command to access the site on your server? — shingo, Jun 08 '23 at 10:46
If you add `curl_setopt($ch, CURLOPT_HEADER, true);` and run this from the CLI as a test, you will see you are getting a [`HTTP/2 301`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/301) — RiggsFolly, Jun 08 '23 at 10:49
@CBroe: I can't talk to the server admin, it's not my website — Jeremie, Jun 08 '23 at 10:59
I am not talking about the server admin of that website you are trying to curl (the problem is not on _their_ end), I am talking about the admin of what you yourself called "my server". — CBroe, Jun 08 '23 at 11:02
Tried WHAT? I only told you what the issue may be by showing you my test — RiggsFolly, Jun 08 '23 at 11:02

score 1 · Answer 1 · answered Jun 08 '23 at 14:41

1

The issue was on our server configuration, not our code.

Following @CBroe suggestion, we simply changed our DNS server and now it works.

answered Jun 08 '23 at 14:41

Jeremie

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Why does PHP curl returns error 6 for one website?

1 Answers1