diff --git a/amd/build/connectivity_test.min.js b/amd/build/connectivity_test.min.js
index ea6eebab3..27820f787 100644
--- a/amd/build/connectivity_test.min.js
+++ b/amd/build/connectivity_test.min.js
@@ -1,3 +1,3 @@
-define("auth_saml2/connectivity_test",["exports"],(function(_exports){Object.defineProperty(_exports,"__esModule",{value:!0}),_exports.init=void 0;_exports.init=(checkTarget,redirURL)=>{const http=new XMLHttpRequest;http.open("HEAD",checkTarget),http.addEventListener("load",(()=>{window.location=redirURL})),http.send()}}));
+define("auth_saml2/connectivity_test",["exports"],(function(_exports){Object.defineProperty(_exports,"__esModule",{value:!0}),_exports.init=void 0;_exports.init=(checkTarget,redirURL)=>{fetch(checkTarget,{mode:"no-cors",method:"HEAD"}).then((()=>{window.location=redirURL}))}}));
 
 //# sourceMappingURL=connectivity_test.min.js.map
\ No newline at end of file
diff --git a/amd/build/connectivity_test.min.js.map b/amd/build/connectivity_test.min.js.map
index 4c517b419..9630134f6 100644
--- a/amd/build/connectivity_test.min.js.map
+++ b/amd/build/connectivity_test.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"connectivity_test.min.js","sources":["../src/connectivity_test.js"],"sourcesContent":["\n// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Module to check connectivity to IdP endpoint from client.\n *\n * @module     auth_saml2/connectivity_test\n * @copyright  2023 Peter Burnett <peterburnett@catalyst-au.net>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\nexport const init = (checkTarget, redirURL) => {\n    const http = new XMLHttpRequest();\n    http.open('HEAD', checkTarget);\n    http.addEventListener('load', () => {\n        window.location = redirURL;\n    });\n    http.send();\n};\n"],"names":["checkTarget","redirURL","http","XMLHttpRequest","open","addEventListener","window","location","send"],"mappings":"iKAwBoB,CAACA,YAAaC,kBACxBC,KAAO,IAAIC,eACjBD,KAAKE,KAAK,OAAQJ,aAClBE,KAAKG,iBAAiB,QAAQ,KAC1BC,OAAOC,SAAWN,YAEtBC,KAAKM"}
\ No newline at end of file
+{"version":3,"file":"connectivity_test.min.js","sources":["../src/connectivity_test.js"],"sourcesContent":["\n// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Module to check connectivity to IdP endpoint from client.\n *\n * @module     auth_saml2/connectivity_test\n * @copyright  2023 Peter Burnett <peterburnett@catalyst-au.net>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\nexport const init = (checkTarget, redirURL) => {\n    // We need to use no-cors to ignore cors, however,\n    // this means we are returned an opaque response.\n    // But an opaque response is info to say if the site is accessible or not.\n    fetch(checkTarget, { mode: 'no-cors', method: 'HEAD' }).then(() => {\n        window.location = redirURL;\n    });\n};\n"],"names":["checkTarget","redirURL","fetch","mode","method","then","window","location"],"mappings":"iKAwBoB,CAACA,YAAaC,YAI9BC,MAAMF,YAAa,CAAEG,KAAM,UAAWC,OAAQ,SAAUC,MAAK,KACzDC,OAAOC,SAAWN"}
\ No newline at end of file
diff --git a/amd/src/connectivity_test.js b/amd/src/connectivity_test.js
index 3e484c26f..30a69f53f 100644
--- a/amd/src/connectivity_test.js
+++ b/amd/src/connectivity_test.js
@@ -23,10 +23,10 @@
  */
 
 export const init = (checkTarget, redirURL) => {
-    const http = new XMLHttpRequest();
-    http.open('HEAD', checkTarget);
-    http.addEventListener('load', () => {
+    // We need to use no-cors to ignore cors, however,
+    // this means we are returned an opaque response.
+    // But an opaque response is info to say if the site is accessible or not.
+    fetch(checkTarget, { mode: 'no-cors', method: 'HEAD' }).then(() => {
         window.location = redirURL;
     });
-    http.send();
 };
diff --git a/version.php b/version.php
index d8a820ae3..7c8fd47a0 100644
--- a/version.php
+++ b/version.php
@@ -24,8 +24,8 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2024082000;    // The current plugin version (Date: YYYYMMDDXX).
-$plugin->release   = 2024082000;    // Match release exactly to version.
+$plugin->version   = 2024090900;    // The current plugin version (Date: YYYYMMDDXX).
+$plugin->release   = 2024090900;    // Match release exactly to version.
 $plugin->requires  = 2017051509;    // Requires PHP 7, 2017051509 = T12. M3.3
                                     // Strictly we require either Moodle 3.5 OR
                                     // we require Totara 3.3, but the version number