ENOTUNIQ
Linux / POSIXERRORNotableNetworkHIGH confidence
Name Not Unique on Network
Production Risk
Indicates hostname/address conflicts on the network.
What this means
ENOTUNIQ (errno 76) is returned when a network name or address is not unique, typically in RFS or distributed filesystem contexts.
Why it happens
- 1Duplicate hostname or address on a RFS/distributed network
How to reproduce
RFS operation with duplicate network name.
trigger — this will error
trigger — this will error
// errno = ENOTUNIQ when name not unique on network
expected output
Name not unique on network (ENOTUNIQ)
Fix
Ensure unique hostnames/addresses
WHEN When ENOTUNIQ occurs
Ensure unique hostnames/addresses
# Check for duplicate hostnames nmap -sn 192.168.1.0/24 | grep $(hostname) # Assign a unique hostname hostnamectl set-hostname unique-hostname
Why this works
Network names must be unique for distributed filesystem operations.
Sources
Official documentation ↗
Linux Programmer Manual errno(3)
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