ENETUNREACH (errno 101)

errno 101

LINUX

Network is unreachable

Linux terminal running strace with the failing system call and errno highlighted
Linux errno: trace the exact failing system call before changing anything.

What it means

ENETUNREACH is a Linux error code reported by Linux and other POSIX systems. Its official message is: “Network is unreachable”

How to fix ENETUNREACH (errno 101)

  1. Verify the peer is still listening: 'ss -lntp' (server side) and test the port
  2. Add retry with backoff — errno-level network glitches are expected on TCP
  3. Check conntrack/iptables counters for dropped packets: 'iptables -L -v'

Related errors

EADDRINUSE (errno 98)ECONNRESET (errno 104)ENETDOWN (errno 100)EROFS (errno 30)EPIPE (errno 32)ETIMEDOUT (errno 110)ECONNREFUSED (errno 111)EHOSTUNREACH (errno 113)

Source: Linux kernel errno.h

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