Can't mount nfs4 directories with Kerberos auth on CentOS 5

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http://www.linuxquestions.org – I have an nfs server running Solaris. It works fine and a large number of clients happily mount directories from it. But only almost all clients. All clients that have problem run CentOS (5.4 and 5.5). I've found one or two of each version that fail, but also a couple of each version that work. The mounting is done via autofs but that doesn't seem to make any difference. Kerberos is used for authentication. When I try to mount a directory manually I get this: Code: # mount -vvvv -t nfs4 -o sec=krb5 triangulum.ifm.liu.se:/export/users/hans /mnt mount: pinging: prog 100003 vers 4 prot tcp (HowTos)