diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b2cb43e25..23be962d9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,9 @@
 - Fix: リンク切れを修正
 
 ### Server
+- Enhance: 起動前の疎通チェックで、DBとメイン以外のRedisの疎通確認も行うように  
+  (Based on https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/588)  
+  (Cherry-picked from https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/715)
 - Fix: Nested proxy requestsを検出した際にブロックするように
   [ghsa-gq5q-c77c-v236](https://github.com/misskey-dev/misskey/security/advisories/ghsa-gq5q-c77c-v236)
 - Fix: 招待コードの発行可能な残り数算出に使用すべきロールポリシーの値が違う問題を修正  
diff --git a/packages/backend/scripts/check_connect.js b/packages/backend/scripts/check_connect.js
index ba25fd416c..bb149444b5 100644
--- a/packages/backend/scripts/check_connect.js
+++ b/packages/backend/scripts/check_connect.js
@@ -5,11 +5,52 @@
 
 import Redis from 'ioredis';
 import { loadConfig } from '../built/config.js';
+import { createPostgresDataSource } from '../built/postgres.js';
 
 const config = loadConfig();
-const redis = new Redis(config.redis);
 
-redis.on('connect', () => redis.disconnect());
-redis.on('error', (e) => {
-	throw e;
-});
+async function connectToPostgres() {
+	const source = createPostgresDataSource(config);
+	await source.initialize();
+	await source.destroy();
+}
+
+async function connectToRedis(redisOptions) {
+	return await new Promise(async (resolve, reject) => {
+		const redis = new Redis({
+			...redisOptions,
+			lazyConnect: true,
+			reconnectOnError: false,
+			showFriendlyErrorStack: true,
+		});
+		redis.on('error', e => reject(e));
+
+		try {
+			await redis.connect();
+			resolve();
+
+		} catch (e) {
+			reject(e);
+
+		} finally {
+			redis.disconnect(false);
+		}
+	});
+}
+
+// If not all of these are defined, the default one gets reused.
+// so we use a Set to only try connecting once to each **uniq** redis.
+const promises = Array
+	.from(new Set([
+		config.redis,
+		config.redisForPubsub,
+		config.redisForJobQueue,
+		config.redisForTimelines,
+		config.redisForReactions,
+	]))
+	.map(connectToRedis)
+	.concat([
+		connectToPostgres()
+	]);
+
+await Promise.allSettled(promises);