Open Firewall on Google Cloud
Step 1 - Locate firewall settings
VPC network
Login to google cloud, select your project, choose VPC Network from quick access. If it not appear in Quick access then you may need to find it in View all products

Firewall
From VPC network choose Firewall

Step 2 - Create firewall rule
Choose Create Firewall Rule

Fill the firewall settings
Direction of traffic: Ingress
Action on match: Allow
Targets: All instances
Source IP: 0.0.0.0/0
Port: the port you want to open eg: 2345

Click Create to create the rule

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