Can create and delete but not overwrite

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I have a strange problem with Kerberos security and NFVv4.

I have two servers, one running RHEL 4 (kernel 2.6.9-89.0.25.ELsmp) and the other RHEL 5 (2.6.18-194.3.1.el5). Clients running either OS work fine.

I have one user who is using Ubuntu (9.04 Jaunty; the kernel is 2.6.28-19-generic #61-Ubuntu). On that machine, he can access filesystems on the RHEL 5 server fine. Using filesystems mounted from the RHEL 4 server, authenticated users can create and write files, but they cannot write to an existing file. SO, for example,

echo foo >foo

works, but a subsequent

echo foo >foo

says "Input/Output Error".

Any ideas?

--
Steve Gaarder
System Administrator, Dept of Mathematics
Cornell University, Ithaca, NY, USA
gaarder@xxxxxxxxxxxxxxxx
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