Hello, With Nfs Ganesha 2.7.6 when we use NFS clients on older kernels ( RHEL 7.2 – 3.10.0-327.el7.x86_64 ) to mount a share using NFS vers=4.1 all file operations fail. Clients can navigate directories, but cannot read/write data to any file. Open fails because the older kernel cannot handle OPEN_DELEGATE_NONE_EXT specified in the Open response. If OPEN_DELEGATE_NONE_EXT was returned only when OPEN4_SHARE_ACCESS_WANT_XXX was specified, then we could be backwards compatible. With Nfs Ganesha 2.5.x ( no delegation support), NFS clients on the older kernels can successfully mount and use the share with NFS vers 4.1 ( Also reported here: https://lists.nfs-ganesha.org/archives/list/devel@lists.nfs-ganesha.org/thre... ) Thoughts? Thanks, Vandana