Mac Error 56 — Network Connection Reset (ECONNRESET)

Mac error 56 is a network connection reset error occurring when a remote server or network device forcibly closes an established connection during data transfer. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Error 56 maps to ECONNRESET — the connection was reset by the peer. The remote end sent a TCP RST packet, terminating the connection. Common during large file downloads, streaming, or sustained network operations. VPN connections frequently trigger this error during reconnection. Can be caused by network equipment (routers, firewalls) with aggressive timeout settings. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Server closed the connection due to timeout or overload. Firewall or router reset idle connections (TCP keepalive not sent). VPN tunnel dropped and reconnected, resetting active connections. ISP network equipment injecting TCP RST packets. SSL/TLS renegotiation failure during long-lived connections. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Retry the operation — transient network issues often resolve on retry. Check Wi-Fi signal strength and switch to a wired connection if possible. Disable VPN and test — VPNs can cause connection resets during tunnel changes. Adjust MTU size: sudo ifconfig en0 mtu 1400 (can help with fragmentation issues). Check router firmware — update if connection resets are frequent. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Mac Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.