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Troubleshooting Connection Reset by Peer Error in Android VPN App Using SOCKS5 Proxy

Use this when an Android VPN client using a SOCKS5 proxy fails with Connection reset by peer.

Quick Read

  • Symptom: Use this when an Android VPN client using a SOCKS5 proxy fails with Connection reset by peer.
  • Check first: Verify proxy server address and port
  • Risk: Review before running

Symptoms

Users experience a 'Connection reset by peer' error when attempting to connect through a SOCKS5 proxy in an Android VPN application.

Environment

Android devices running various versions of the operating system, using a SOCKS5 proxy for VPN connections.

Most Likely Causes

Possible causes include incorrect proxy settings, network issues, or server-side restrictions.

What to Check First

  1. Verify proxy server address and port
  2. Check internet connectivity on the device
  3. Test the SOCKS5 proxy with another application

Fix Steps

  1. Verify the SOCKS5 proxy settings in the VPN app.

    Ensure that the proxy server address and port are correctly configured in the VPN app settings.

  2. Test internet connectivity on the device.

    Open a web browser and navigate to a known website to confirm that the device has internet access.

    Example pattern only. Adjust for your environment before running.

    ping google.com
  3. Check the SOCKS5 proxy server status.

    Use a different device or application to connect to the SOCKS5 proxy and verify its operational status.

    Safe to run: read-only

    curl --socks5 <proxy_address>:<port> http://example.com
  4. Review the VPN app logs for error messages.

    Access the logs within the VPN app to identify any specific error messages related to the connection reset.

  5. Change the SOCKS5 proxy server to a different one.

    Update the VPN app settings to use an alternative SOCKS5 proxy server to determine if the issue is server-specific.

Validation

  • Confirm that the VPN app connects successfully without the 'Connection reset by peer' error after making changes.

Logs to Check

  • VPN app logs for connection errors
  • Android system logs for network-related issues

Rollback and Escalation

  • If the new proxy does not resolve the issue, revert to the original proxy settings.

Escalate When

  • If the issue persists after trying multiple proxies and verifying settings, escalate to the network administrator for further investigation.

Edge Cases

  • Proxy server may be blocking specific traffic types or protocols.
  • Network firewalls may be interfering with the VPN connection.

Notes from the Field

  • Ensure that the device is not connected to a captive portal network which may restrict access.
  • Confirm that the SOCKS5 proxy supports the required authentication method if applicable.