EUNATCH (errno 49)

errno 49

LINUX

Protocol driver not attached

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

EUNATCH is a Linux error code reported by Linux and other POSIX systems. Its official message is: “Protocol driver not attached”

How to fix EUNATCH (errno 49)

  1. Reproduce with 'strace -f -e trace=<syscall> <cmd>' to see the exact failing call
  2. Confirm the errno with 'perror <code>' and correlate with 'dmesg' kernel messages
  3. Isolate the version — re-test on a clean shell or minimal container

Related errors

ELNRNG (errno 48)ENOCSI (errno 50)EL3RST (errno 47)EMFILE (errno 24)ENOSPC (errno 28)EROFS (errno 30)EPIPE (errno 32)EADDRINUSE (errno 98)

Source: Linux kernel errno.h

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