Quick Summary
Error code NP-31730-4 on PlayStation typically indicates a problem connecting to PlayStation Network (PSN). This can prevent you from signing in to your account and accessing online features.
Common Causes
- PSN Service Outage: PlayStation Network servers might be temporarily down for maintenance or experiencing an outage due to high traffic or unforeseen issues.
- Internet Connection Problems: Issues with your home network, such as a weak Wi-Fi signal, a problem with your modem or router, or interference with the network connection, can prevent your PlayStation from connecting to PSN.
- Incorrect Date and Time Settings: If the date and time settings on your PlayStation console are incorrect, it can interfere with secure connections to PSN servers.
- Firewall or Router Blocking PSN: Your router or firewall settings might be blocking communication with PSN servers. This is especially common in networks with stricter security configurations.
Step-by-Step Fixes
Method 1: Check PSN Service Status
Step 1: Visit the official PlayStation Network Service Status page (search on playstation.com) to check if there are any reported outages or maintenance.
Step 2: If PSN is down, wait for the service to be restored before attempting to sign in again.
Method 2: Restart Your Modem and Router
Step 1: Power off your PlayStation console completely.
Step 2: Unplug your modem and router from the power outlet.
Step 3: Wait for about 30 seconds.
Step 4: Plug your modem back in and wait for it to fully initialize (usually when the lights become stable).
Step 5: Plug your router back in and wait for it to fully initialize.
Step 6: Turn on your PlayStation console and try signing in to PSN again.
Method 3: Check Your Internet Connection on PlayStation
Step 1: On your PlayStation console, go to Settings > Network > Test Internet Connection.
Step 2: Follow the on-screen instructions to test your internet connection.
Step 3: If the test fails, note the specific error message and troubleshoot your internet connection accordingly (check your Wi-Fi signal, Ethernet cable, or contact your ISP).
Method 4: Set Date and Time Manually
Step 1: On your PlayStation console, go to Settings > Date and Time.
Step 2: Select 'Set Manually'.
Step 3: Enter the correct date and time.
Step 4: Try signing in to PSN again.
Method 5: Review Router/Firewall Settings
Step 1: Access your router's settings page (usually by typing your router's IP address into a web browser).
Step 2: Look for firewall settings or port forwarding options.
Step 3: Ensure that the following ports are open for PlayStation Network:
- TCP: 80, 443, 3478, 3479, 3480
- UDP: 3478, 3479
Step 4: Consult your router's manual for specific instructions on how to open ports or configure firewall settings.
Note: Modifying router settings can affect internet security. If you're not comfortable doing this, contact your ISP or a network technician for assistance.