Why does Listing files on an NFSv4 share being shared out by a z/OS mainframe results in "Unknown error 521"?

Solution Unverified - Updated -

Issue

  • Listing files on an NFSv4 share being shared out by a z/OS mainframe results in Unknown error 521:
ls: cannot access foo: Unknown error 521
ls: cannot access tmp: Unknown error 521
ls: cannot access foo2: Unknown error 521
ls: cannot access foo3: Unknown error 521
total 0
-????????? ? ? ? ?            ? foo
-????????? ? ? ? ?            ? foo2
-????????? ? ? ? ?            ? foo3
d????????? ? ? ? ?            ? tmp

Environment

  • Red Hat Enterprise Linux 6.2 with kernel 2.6.32-131.0.15.el6.s390x
  • z/OS Mainframe
  • NFSv4

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