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UDP 4045

ProtocolUDP
Port4045
LabelsSolaris lockd NFS lock daemon/manager

Synopsis

  • UDP port 4045 is assigned to the NFS Lock Manager (NLM, aka lockd) used with NFSv2/v3 over SunRPC.
  • Oracle Solaris lockd listens on UDP 4045 by default for NFS file-locking operations.
  • Linux distributions (e.g., RHEL, CentOS, Debian/Ubuntu) commonly run the kernel lockd/NLM service on UDP 4045 when configured, and enterprises often pin it to 4045 for firewalling.
  • FreeBSD and other BSDs expose rpc.lockd on UDP 4045 for NFSv2/v3 locking.
  • Network storage appliances use it as well, including NetApp ONTAP NFS and Dell EMC Isilon/PowerScale NFS, which handle NLM traffic on UDP 4045.
  • Security note: NLM/lockd has had historical vulnerabilities and is probed in NFS-targeted attacks, so UDP 4045 is typically restricted from untrusted networks.

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