NFS server fails to respond to TCP three-way handshake with SYN_ACK on Red Hat Enterprise Linux 5.9 resulting in a hang on the NFS client

Solution In Progress - Updated -

Issue

  • Periodically NFS clients fail to re-establish a previously timed out NFS connection when the three-way handshake fails.

  • NFS client shows symptoms of an unresponsive NFS server in /var/log/messages:

Nov  8 15:18:17 hosta kernel: nfs: server nfsserver not responding, still trying

Environment

  • Red Hat Enterprise Linux 5.9
    • kernel 2.6.18-348.6.1.el5
  • NFSv3
  • NFSv4

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.