diff --git a/apps/settings/lib/SetupChecks/JavaScriptModules.php b/apps/settings/lib/SetupChecks/JavaScriptModules.php
index 81f580a37bc98..6aff7dcfaaafd 100644
--- a/apps/settings/lib/SetupChecks/JavaScriptModules.php
+++ b/apps/settings/lib/SetupChecks/JavaScriptModules.php
@@ -68,7 +68,7 @@ public function run(): SetupResult {
 		}
 
 		if ($noResponse) {
-			return SetupResult::warning($this->l10n->t('Could not check for JavaScript support. Please check manually if your webserver serves `.mjs` files using the JavaScript MIME type.') . "\n" . $this->serverConfigHelp());
+			return SetupResult::warning($this->l10n->t('Could not check for JavaScript support via any of your `trusted_domains` nor `overwrite.cli.url`. This may be the result of a server-side DNS mismatch or outbound firewall rule. Please check manually if your webserver serves `.mjs` files using the JavaScript MIME type.') . "\n" . $this->serverConfigHelp());
 		}
 		return SetupResult::error($this->l10n->t('Your webserver does not serve `.mjs` files using the JavaScript MIME type. This will break some apps by preventing browsers from executing the JavaScript files. You should configure your webserver to serve `.mjs` files with either the `text/javascript` or `application/javascript` MIME type.'));