Mac Error 56 — Network Connection Reset (ECONNRESET)

Overview

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.

Key Details

• 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

Common Causes

• 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

Steps

1. 1Retry the operation — transient network issues often resolve on retry
2. 2Check Wi-Fi signal strength and switch to a wired connection if possible
3. 3Disable VPN and test — VPNs can cause connection resets during tunnel changes
4. 4Adjust MTU size: sudo ifconfig en0 mtu 1400 (can help with fragmentation issues)
5. 5Check router firmware — update if connection resets are frequent

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Frequently Asked Questions