I’m trying to connect my Flask app running on Google Cloud Run to a Google Cloud Memorystore Redis instance, but I keep getting a timeout error. Both Cloud Run and Redis are in the same region and VPC network, and everything seems configured correctly, but it still won’t connect.

Setup Details:

• Redis IP: 10.x.x.x
• Cloud Run Region: europe-west4
• Redis Region: europe-west4-a
• VPC Connector: default-connector (attached to Cloud Run)

Firewall Rules:

• Ingress allows traffic to Redis on port 6379 from the VPC connector IP range (100.8.0.0/28)
• Egress rules allow outgoing traffic from Cloud Run to Redis

What I’ve Tried:

• Checked VPC Flow logs, Enabled flow logs but haven’t seen anything indicating network traffic from Cloud Run to Redis
• Checked Firewall logs, The logs show no blocks, and the rules should allow Redis traffic

Simple script I use to test, right now it always returns “Error connecting to Redis: timeout connecting to server”

from flask import Flask
import redis

app = Flask(__name__)


@app.route("/")
def test_redis():
    try:
        redis_host = "10.x.x.x"
        redis_port = int(6379)
        r = redis.Redis(
            host=redis_host, port=redis_port, db=0, socket_connect_timeout=20
        )
        r.ping()
        return "Successfully connected to Redis!"
    except Exception as e:
        return f"Error connecting to Redis: {e}", 500


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8080)

Any suggestion or help is greatly appreciated, as I’ve tried any resource I could find and to me it feels like I’ve done everything the same.