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NFS reply xid 3844308326 reply ERR 20: Auth Rejected Credentials (client should begin new session)

Getting this?

tcpdump -i eth0 -s 0 -w dump.dat
tcpdump -r dump.dat |grep -Ei "psql02|nfs-c01"

02:55:48.731360 IP psql02.nix.mds.xyz.33991 > nfs-c01.nix.mds.xyz.nfs: Flags [P.], seq 1:693, ack 1, win 229, options [nop,nop,TS val 166990 ecr 5681495], length 692: NFS request xid 3844308326 688 null
02:55:48.731483 IP nfs-c01.nix.mds.xyz.nfs > psql02.nix.mds.xyz.33991: Flags [.], ack 693, win 238, options [nop,nop,TS val 5681498 ecr 166990], length 0
02:55:48.732644 IP nfs-c01.nix.mds.xyz.nfs > psql02.nix.mds.xyz.33991: Flags [P.], seq 1:25, ack 693, win 238, options [nop,nop,TS val 5681499 ecr 166990], length 24: NFS reply xid 3844308326 reply ERR 20: Auth Rejected Credentials (client should begin new session)
02:55:48.732670 IP psql02.nix.mds.xyz.33991 > nfs-c01.nix.mds.xyz.nfs: Flags [.], ack 25, win 229, options [nop,nop,TS val 166991 ecr 5681499], length 0

Try this patch to bring nfs-utils-1.3.0-0.48.el7_4.1.x86_64 up to nfs-utils-1.3.0-0.48.el7_4.2.x86_64:

http://download.rhn.redhat.com/errata/RHBA-2018-0422.html

Update and enjoy?  Nope!  So let's keep digging:

 

Cheers,
TK

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