diff --git a/package.json b/package.json
index 519a8c453d..f60fd789db 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
 		"build": "pnpm build-pre && pnpm -r build && pnpm build-assets",
 		"build-storybook": "pnpm --filter frontend build-storybook",
 		"build-misskey-js-with-types": "pnpm build-pre && pnpm --filter backend... --filter=!misskey-js build && pnpm --filter backend generate-api-json && ncp packages/backend/built/api.json packages/misskey-js/generator/api.json && pnpm --filter misskey-js update-autogen-code && pnpm --filter misskey-js build && pnpm --filter misskey-js api",
-		"start": "pnpm check:connect && cd packages/backend && node ./built/boot/entry.js",
+		"start": "pnpm check:connect && cd packages/backend && MK_WARNED_ABOUT_CONFIG=true node ./built/boot/entry.js",
 		"start:test": "cd packages/backend && cross-env NODE_ENV=test node ./built/boot/entry.js",
 		"init": "pnpm migrate",
 		"migrate": "cd packages/backend && pnpm migrate",
diff --git a/packages/backend/src/config.ts b/packages/backend/src/config.ts
index 9596b3a722..f3957fae76 100644
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -222,8 +222,15 @@ export function loadConfig(): Config {
 		JSON.parse(fs.readFileSync(`${_dirname}/../../../built/_vite_/manifest.json`, 'utf-8'))
 		: { 'src/_boot_.ts': { file: 'src/_boot_.ts' } };
 
-	const config = globSync(path).sort()
-		.map(path => fs.readFileSync(path, 'utf-8'))
+	const configFiles = globSync(path).sort();
+
+	if (configFiles.length === 0
+			&& !process.env['MK_WARNED_ABOUT_CONFIG']) {
+		console.log('No config files loaded, check if this is intentional');
+		process.env['MK_WARNED_ABOUT_CONFIG'] = true;
+	}
+
+	const config = configFiles.map(path => fs.readFileSync(path, 'utf-8'))
 		.map(contents => yaml.load(contents) as Source)
 		.reduce(
 			(acc: Source, cur: Source) => Object.assign(acc, cur),
@@ -249,7 +256,7 @@ export function loadConfig(): Config {
 		version,
 		publishTarballInsteadOfProvideRepositoryUrl: !!config.publishTarballInsteadOfProvideRepositoryUrl,
 		url: url.origin,
-		port: config.port ?? parseInt(process.env.PORT ?? '', 10),
+		port: config.port ?? parseInt(process.env.PORT ?? '3000', 10),
 		socket: config.socket,
 		chmodSocket: config.chmodSocket,
 		disableHsts: config.disableHsts,