getattr ERROR: Request couldn't be completed in time

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hi,

i'm trying to mount a NFS 4 share with "sec=sys" from a NetApp FAS3250 on a CentOS KVM guest. this doesn't work, the mount doesn't complete and hangs.

mount command is:
/bin/mount -v -t nfs -s -o vers=4.1,sec=sys 10.110.96.90:/home /home/cir

what i'm seeing in tcpdump is:

08:36:48.875019 IP 10.110.96.112.2456702824 > 10.110.96.90.2049: 212 getattr fh 0,1/53 08:36:48.875355 IP 10.110.96.90.2049 > 10.110.96.112.2456702824: reply ok 96 getattr ERROR: Request couldn't be completed in time

server: 10.110.96.90
client: 10.110.96.112

status of nfs services:

nfslock: running
rpcbind: running
rpcidmapd: stopped

this happens with a centos 6 _and_ a centos 7 client (both KVM).
NFS 3 mount from the same host don't work either.

other kvm guests (centos 6) on the same physical host can mount the share with no problem.

the netapp admin tells me there's "no problem" on his side.
iptables is disabled of course.

###

what could be the problem on my (client) side?
could this be a kvm problem?

kvm host is centos 6.
network mode is "bridge".
network driver is "virtio".

thx for any advice
matthias
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