Failed WordPress to Moodle test connection

Hello,

The two specified URLs are only accessible within my local home network.

The Ubuntu server, where both applications are installed and running under Apache2, has the local IP address 192.168.30.40. On my home DNS server, I configured the hostnames lms.wordpress.local and lms.moodle.local to resolve to this IP address. Therefore, it is of course expected that these URLs are not reachable from the internet by you.

The Apache server is functioning correctly, as I can access the WordPress admin interface via lms.wordpress.local and the Moodle admin interface via lms.moodle.local without any issues.

Additionally, when accessing the local server via the following URL:

https://lms.moodle.local/webservice/rest/server.php?wstoken=2f73e220ba27271267ecf26a48156eef&wsfunction=auth_edwiserbridge_test_connection&moodlewsrestformat=json

the browser returns the following JSON-formatted response coming from Moodle web server interface:

{"exception":"core\\exception\\invalid_parameter_exception","errorcode":"invalidparameter","message":"Invalid parameter value detected"}

This response clearly indicates that both Apache2 and the Moodle installation are functioning correctly and the web server interface is active. If Apache2 were misconfigured or Moodle were not properly set up, the browser would not return a structured error message—instead, it would result in a timeout or connection error.

If I call the same command with an invalid token, the response is

{"exception":"core\\exception\\moodle_exception","errorcode":"invalidtoken","message":"Invalid token - token not found"}

To demonstrate that my Moodle instance is functioning properly and also my token ist correct, I verified the same Moodle instance and webservice interface by accessing the following URL:

https://lms.moodle.local/webservice/rest/server.php?wstoken=2f73e220ba27271267ecf26a48156eef&wsfunction=core_webservice_get_site_info&moodlewsrestformat=json

I am getting this response

{"sitename":"Test","username":"admin","firstname":"Armin","lastname":"xxxx","fullname":"Armin xxxx","lang":"en","userid":2,"siteurl":"https:\/\/lms.moodle.local","userpictureurl":"https:\/\/lms.moodle.local\/pluginfile.php\/5\/user\/icon\/degrade\/f1?rev=175","functions":[{"name":"core_user_create_users","version":"2024100703.04"},{"name":"core_user_delete_users","version":"2024100703.04"},{"name":"core_user_get_users_by_field","version":"2024100703.04"},{"name":"core_user_update_users","version":"2024100703.04"},{"name":"core_course_get_courses","version":"2024100703.04"},{"name":"core_course_get_courses_by_field","version":"2024100703.04"},{"name":"core_course_get_categories","version":"2024100703.04"},{"name":"enrol_manual_enrol_users","version":"2024100700"},{"name":"enrol_manual_unenrol_users","version":"2024100700"},{"name":"core_enrol_get_users_courses","version":"2024100703.04"},{"name":"core_cohort_add_cohort_members","version":"2024100703.04"},{"name":"core_cohort_create_cohorts","version":"2024100703.04"},{"name":"core_role_assign_roles","version":"2024100703.04"},{"name":"core_role_unassign_roles","version":"2024100703.04"},{"name":"core_cohort_delete_cohort_members","version":"2024100703.04"},{"name":"core_cohort_get_cohorts","version":"2024100703.04"},{"name":"core_webservice_get_site_info","version":"2024100703.04"},{"name":"auth_edwiserbridge_test_connection","version":"2025040200"},{"name":"auth_edwiserbridge_get_site_data","version":"2025040200"},{"name":"auth_edwiserbridge_get_course_progress","version":"2025040200"},{"name":"auth_edwiserbridge_get_edwiser_plugins_info","version":"2025040200"},{"name":"auth_edwiserbridge_get_course_enrollment_method","version":"2025040200"},{"name":"auth_edwiserbridge_update_course_enrollment_method","version":"2025040200"},{"name":"auth_edwiserbridge_get_mandatory_settings","version":"2025040200"},{"name":"auth_edwiserbridge_enable_plugin_settings","version":"2025040200"},{"name":"auth_edwiserbridge_validate_token","version":"2025040200"},{"name":"auth_edwiserbridge_verify_sso_token","version":"2025040200"},{"name":"auth_edwiserbridge_get_users","version":"2025040200"},{"name":"auth_edwiserbridge_get_courses","version":"2025040200"},{"name":"auth_edwiserbridge_manage_cohort_enrollment","version":"2025040200"},{"name":"auth_edwiserbridge_delete_cohort","version":"2025040200"},{"name":"auth_edwiserbridge_manage_user_cohort_enrollment","version":"2025040200"}],"downloadfiles":1,"uploadfiles":1,"release":"4.5.3+ (Build: 20250328)","version":"2024100703.04","mobilecssurl":"","advancedfeatures":[{"name":"usecomments","value":1},{"name":"usetags","value":1},{"name":"enablenotes","value":1},{"name":"messaging","value":1},{"name":"enableblogs","value":1},{"name":"enablecompletion","value":1},{"name":"enablebadges","value":1},{"name":"messagingallusers","value":0},{"name":"enablecustomreports","value":1},{"name":"enableglobalsearch","value":0},{"name":"mnet_dispatcher_mode","value":0},{"name":"enablecompetencies","value":1}],"usercanmanageownfiles":true,"userquota":0,"usermaxuploadfilesize":-1,"userhomepage":0,"userprivateaccesskey":"f13747c321e5e6990fb8685e2e0e7bfd","siteid":1,"sitecalendartype":"gregorian","usercalendartype":"gregorian","userissiteadmin":true,"theme":"degrade","limitconcurrentlogins":0,"policyagreed":0}

As you can see, basic web service access is functioning correctly.

The only difference lies in the wsfunction parameter. Moreover, since the core_webservice_get_site_info call returns a JSON response listing all supported web service functions, this confirms that the function auth_edwiserbridge_test_connection should indeed be available and supported.

Is there any configuration in Moodle that I might have overlooked which could prevent receiving a valid response from the web service interface?

P.S.: I would also like to inform you that, once my private testing with Edwiser Bridge at home is successfully completed, the company I work for intends to proceed with the purchase of an official Edwiser Bridge Pro Lifetime license in Q3/2025.

Thanks
Armin

Thank you for your proposal.

There is one thing I need to understand and this is why I am repeating what I wrote yesterday

• I am opening my Chrome web browser (this has nothing to do with WordPress and works independently)
• I am entering the following URL line to the address bar (to simulate access to moodle service) https://lms.moodle.local/webservice/rest/server.php?wstoken=2f73e220ba27271267ecf26a48156eef&wsfunction=auth_edwiserbridge_test_connection&moodlewsrestformat=json
• This line accesses the web server in Moodle directly and should address ediser plugin in moodle and this access does not use any WordPress code since all runs in my Chrome browser
• Then I get back the following textual response in the Chrome browser {"exception":"core\\exception\\invalid_parameter_exception","errorcode":"invalidparameter","message":"Invalid parameter value detected"}

But now you are writing that I have to change source code in WordPress in order to debug Moodle web services. Should we not rather see why the simple combination of Chrome and with Moodle does not work?

I continued my tests and inserted one more error_log()

    public function connection_test_initiater() {

            error_log('connection_test_initiater() called');

            // verifying generated nonce we created earlier.
            if ( ! isset( $_POST['_wpnonce_field'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce_field'] ) ), 'check_sync_action' ) ) {
                    die( 'Busted!' );
            }

            // start working on request.
            $url   = isset( $_POST['url'] ) ? sanitize_text_field( wp_unslash( $_POST['url'] ) ) : '';
            $token = isset( $_POST['token'] ) ? sanitize_text_field( wp_unslash( $_POST['token'] ) ) : '';

            $connection_helper = new Eb_Connection_Helper( $this->plugin_name, $this->version );
            $response          = $connection_helper->connection_test_helper( $url, $token );

            echo wp_json_encode( $response );

            error_log(wp_json_encode( $response));

            die();
    }

Then I watched my debug file again. It says

[10-Apr-2025 14:56:22 UTC] connection_test_initiater() called
[10-Apr-2025 14:56:22 UTC] {"success":0,"response_message":"

\n

\n Test Connection failed, To check more information about issue click here <\/span>.\n <\/div>\n\n

\n \t

\n\t

\n\t An issue is detected. <\/h4>\n\t

\n\t \t

Status : <\/b><\/div>\n\t \t

Connection Failed <\/div>\n\t <\/div>\n\t

\n\t \t

Url : <\/b><\/div>\n\t \t

https:\/\/lms.moodle.local\/webservice\/rest\/server.php?wstoken=2f73e220ba27271267ecf26a48156eef&wsfunction=auth_edwiserbridge_test_connection&moodlewsrestformat=json<\/div>\n\t <\/div>\n\t

\n\t \t

Response : <\/b><\/div>\n\t \t

A valid URL was not provided.<\/div>\n\t <\/div>\n\t\t\t\t\t\t\t\t\t

\n\t \t

Click Troubleshoot <\/strong> button to get more details.<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t <\/div>\n\n\t

\n\t\t\t\t\t\t\t\t\t<\/span> \n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

\n <\/div>\n <\/div>"}

You are writing to test a code, but I can’t find it in your post. It might be forgotten, or?

Thanks
Armin

Hello again,

I’ve prepared a Virtual Machine (runs via Oracle VM VirtualBox) with a fully configured Ubuntu 24.04 system. It includes:

• Apache2 web server
• WordPress 6.8
• Moodle 5.0
• Edwiser 4.0.0 plugins installed for both WordPress and Moodle

However, even in this setup, the Edwiser Wizard is still unable to establish communication between the two applications running on the same linux machine.

This VM can be used to test the setup on any Windows PC worldwide. I can provide a download link for the VM image along with the user credentials for Ubuntu, WordPress, and Moodle.

Would it be okay if I send this information to [email protected]?

Best regards,
Armin