Hub doesn't seem to work

Do you get any messages in your web server's error_log file? Are you running on Window or Linux?

Do you get any messages in your web server's error_log file? Are you able to ping h5p.org from your server?

Ok, you can try to print the error message directly to figure out what's going wrong.wrong.
Locate the following line in the h5p.classes.inc file: (it should be close to the top)

  public function fetchExternalData($url, $data = NULL, $blocking = TRUE, $stream = NULL) {
    ...

    $response = drupal_http_request($url, $options);

    ...
  }

And then you add the following right after the line:

    if (!empty($response->error)) { print $response->error; exit; }

Now, try to enable the hub again and you should get the error.

This is the response printout from line 36. The http request is returning status code 200 in Chrome; however -- the code return in h5p module is returning code 0 (which does not exist). The drupal_htttp_request does not return an error...Here's a screenshot of the output.

That's really strange. I'm not able to reproduce this on any of my systems. Are you using some sort of special build of PHP?

Edit:
Do you know if the openssl extension is enabled or not?

Do you know if the openssl extension is enabled or not?

Bump for this. When trying to use the hub on this same system, I am getting "Loading, please wait..." when trying to add a given resource. It never responds with a timeout or error. Pic attached. Please advise on next steps for testing.

https://dl.dropboxusercontent.com/u/33170273/Screen%20Shot%202017-06-18%...

@dfusco This sounds like different issue to me. Check your browser's console(Ctrl+Shift+J in Chrome) for any error messages.

@btopro: did you ever find a solution to this issue?

Very strange.
No there's no CloudFlare or DDNS.

You could try temporarily disabling the openssl extension and see if it makes a difference.

I am having the same Issue. Couldn't communicate with the H5P Hub. Please try again later.
h5p-content:1 Uncaught (in promise) {success: false, message: "Couldn't communicate with the H5P Hub. Please try again later.", errorCode: "NO_RESPONSE"}errorCode: "NO_RESPONSE"message: "Couldn't communicate with the H5P Hub. Please try again later."success: false__proto__: constructor: ƒ Object()hasOwnProperty: ƒ hasOwnProperty()isPrototypeOf: ƒ isPrototypeOf()propertyIsEnumerable: ƒ propertyIsEnumerable()toLocaleString: ƒ toLocaleString()toString: ƒ toString()valueOf: ƒ valueOf()__defineGetter__: ƒ __defineGetter__()__defineSetter__: ƒ __defineSetter__()__lookupGetter__: ƒ __lookupGetter__()__lookupSetter__: ƒ __lookupSetter__()get __proto__: ƒ __proto__()set __proto__: ƒ __proto__()
Promise rejected (async)
value @ h5p-hub-client.js?oupxln:8
e @ h5p-hub-client.js?oupxln:8
e @ h5p-hub-client.js?oupxln:8
ns.SelectorHub @ h5peditor-selector-hub.js?oupxln:19
ns.LibrarySelector @ h5peditor-library-selector.js?oupxln:43
(anonymous) @ js_buaGpRGpA-QMdiBVtMs4OW38lwc3C-byVCnX4nhiCj4.js:3830
c @ jquery.js?oupxln:2
fireWith @ jquery.js?oupxln:2
k @ jquery.js?oupxln:4
r @ jquery.js?oupxln:4
XMLHttpRequest.send (async)
send @ jquery.js?oupxln:4
ajax @ jquery.js?oupxln:4
(anonymous) @ js_buaGpRGpA-QMdiBVtMs4OW38lwc3C-byVCnX4nhiCj4.js:3824
dispatch @ js_buaGpRGpA-QMdiBVtMs4OW38lwc3C-byVCnX4nhiCj4.js:226
v.handle @ js_buaGpRGpA-QMdiBVtMs4OW38lwc3C-byVCnX4nhiCj4.js:226

The strange thing is that it works fine on my local machine.

I tracked the problem to httprl module.
I disabled it and now it works fine.

If you are still set on using httprl, u still can. Just need to uncheck "Use httprl to handle drupal_http_request." and it should work fine.

zhinio: thanks alot for figuring this one out, and sharing the solution with us!

I will add some documentation about your findings to h5p.org.