[Bug 938581] Re: rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented

[Fede]

I've solved my problem by:

1) generating des-cbc-crc only keys in /etc/krb5.keytab on server and client with
     sudo kadmin -p XXX/admin -q "ktadd -e des-cbc-crc:normal nfs/servername.fqn"

2) allowing weak enc. (server and client) and changing the algorithm
order in /etc/krb5.conf (server):

allow_weak_crypto = true
default_etypes = arcfour-hmac-md5 des3-cbc-sha1
default_etypes_des = des-cbc-md5,des-cbc-crc
default_tgs_enctypes = des-cbc-md5,des-cbc-crc
default_tkt_enctypes = des-cbc-md5,des-cbc-crc
permitted_enctypes = des-cbc-md5,des-cbc-crc,des3-cbc-sha1,arcfour-hmac-md5,des-cbc-md4,aes256-cts-hmac-sha1-96,aes128-cts-hmac-sha1-96

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Title:
  rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented

Status in “nfs-utils” package in Ubuntu:
  Triaged

Bug description:
  Since upgrading one of the machines in my network to oneiric this
  lucid machine as been complaining:

  03:43:43 rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented
  03:43:43 rpc.svcgssd ERROR: failed serializing krb5 context for kernel
  03:43:43 rpc.svcgssd WARNING: handle_nullreq: serialize_context_for_kernel failed
  03:43:43 rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented
  03:43:43 rpc.svcgssd ERROR: failed serializing krb5 context for kernel
  03:43:43 rpc.svcgssd WARNING: handle_nullreq: serialize_context_for_kernel failed
  03:45:58 rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented
  03:45:58 rpc.svcgssd ERROR: failed serializing krb5 context for kernel
  03:45:58 rpc.svcgssd WARNING: handle_nullreq: serialize_context_for_kernel failed
  03:45:58 rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented
  03:45:58 rpc.svcgssd ERROR: failed serializing krb5 context for kernel
  03:45:58 rpc.svcgssd WARNING: handle_nullreq: serialize_context_for_kernel failed
  03:47:59 rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented
  03:47:59 rpc.svcgssd ERROR: failed serializing krb5 context for kernel
  03:47:59 rpc.svcgssd WARNING: handle_nullreq: serialize_context_for_kernel failed
  03:47:59 rpc.svcgssd ERROR: prepare_krb5_rfc_cfx_buffer: not implemented
  03:47:59 rpc.svcgssd ERROR: failed serializing krb5 context for kernel
  03:47:59 rpc.svcgssd WARNING: handle_nullreq: serialize_context_for_kernel failed

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nfs-kernel-server 1:1.2.0-4ubuntu4.2
  ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  Architecture: i386
  Date: Wed Feb 22 06:41:12 2012
  ProcEnviron:
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: nfs-utils

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