Kerberos authentication oddities

[Lukas Hejtmanek]

Hello,

I have a simple server with NFSv4 (nfs-utils 1.1.1). I use simple nsswitch for
uid-names mapping and I use kerberos.

However, I'm unable to mount it on client:
mount -t nfs4 -vvv -o sec=krb5,proto=tcp,port=2049,soft smaug1.ics.muni.cz:/
/mnt/nfs
mount: fstab path: "/etc/fstab"
mount: lock path:  "/etc/mtab~"
mount: temp path:  "/etc/mtab.tmp"
mount: spec:  "smaug1.ics.muni.cz:/"
mount: node:  "/mnt/nfs"
mount: types: "nfs4"
mount: opts:  "sec=krb5,proto=tcp,port=2049,soft"
mount: external mount: argv[0] = "/sbin/mount.nfs4"
mount: external mount: argv[1] = "smaug1.ics.muni.cz:/"
mount: external mount: argv[2] = "/mnt/nfs"
mount: external mount: argv[3] = "-v"
mount: external mount: argv[4] = "-o"
mount: external mount: argv[5] = "rw,sec=krb5,proto=tcp,port=2049,soft"
mount.nfs4: pinging: prog 100003 vers 4 prot tcp port 2049
mount.nfs4: Operation not permitted