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
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
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