[CentOS] Strange errors with NFS under CentOS 6.3

Hi all,

This morning, my centos NFS server returns these error messages:

RPC: fragment too large: 0x00800103 RPC: multiple fragments per record not supported RPC: fragment too large: 0x00800103 RPC: multiple fragments per record not supported RPC: fragment too large: 0x00800103 RPC: multiple fragments per record not supported RPC: fragment too large: 0x00800103 RPC: multiple fragments per record not supported

I have googled arround this type of error and the only solution that I have found is to change tso to off in network interface, but error continues. Any idea??

Many thanks.