localhost:1745

Port 1745 doesn't belong to any well-known service. It's an unassigned port — not claimed by MySQL, Redis, Nginx, or any standard application. If something is running on 1745, it's either custom software your organization built, an internal enterprise application, or a development server that someone configured to use this port.

If you found yourself here because something is running on port 1745 and you're not sure what it is, this page will help you figure that out. If you're a developer choosing a port for your own application, we'll cover how to pick a good one.

What's Running on Port 1745?

To find out what process is using this port on your machine:

# Windows
netstat -ano | findstr :1745
# Look at the PID (last column), then:
tasklist | findstr "PID_NUMBER"

# macOS/Linux
lsof -i :1745
# Shows the process name, PID, and user

# Alternative (Linux)
ss -tlnp | grep :1745

The output tells you which application claimed the port. Common possibilities include internal company tools, microservices in development, database management utilities, or enterprise software specific to your organization.

Choosing Ports for Your Own Applications

If you're building an application and need to pick a port, here's the guidance:

Ports 0-1023 (Well-Known Ports) — Reserved for system services like HTTP (80), HTTPS (443), SSH (22), FTP (21). Require root/admin privileges on Linux/macOS. Don't use these for custom apps.

Ports 1024-49151 (Registered Ports) — Many are claimed by popular software (MySQL on 3306, PostgreSQL on 5432, etc.), but plenty are available. Port 1745 falls in this range. If you pick a port here, check IANA's registry to make sure it's not already assigned to something common.

Ports 49152-65535 (Dynamic/Private Ports) — Free for any use. These are the safest choice for custom applications since they're explicitly designated as private. The downside: these high numbers are harder to remember.

Tips for Picking a Port

• Avoid well-known ports: Don't use 3000, 5000, 8000, 8080 etc. unless you want conflicts with popular dev tools
• Use environment variables: Don't hardcode ports. Use PORT=1745 in env files so it's easy to change
• Document your port assignments: If your team runs multiple services, maintain a simple list of which port each service uses
• Check before binding: Have your app check if the port is available before trying to start, and fail with a clear error message

Configuring a Server on Port 1745

# Node.js / Express
const app = require('express')();
app.listen(1745, () => console.log('Running on http://localhost:1745'));

# Python / Flask
app.run(port=1745)

# Python simple server
python -m http.server 1745

# PHP built-in server
php -S localhost:1745

# Nginx (as reverse proxy)
server {
    listen 1745;
    location / {
        proxy_pass http://localhost:3000;
    }
}

Opening Port 1745 in Firewalls

If you need to access port 1745 from another machine (not just localhost), you may need to open it in your firewall:

# Linux (UFW)
sudo ufw allow 1745/tcp

# Linux (firewalld)
sudo firewall-cmd --permanent --add-port=1745/tcp
sudo firewall-cmd --reload

# Windows (PowerShell as admin)
New-NetFirewallRule -DisplayName "Port 1745" -Direction Inbound -Protocol TCP -LocalPort 1745 -Action Allow