Permissions for user/group from NFSv4 ACLs are ignored when mounting shares via NFSv4

[karypid]

I think I may have come across the issue being discussed here:

NFSv4 + Kerberos: idmap / access problems

NFS with Kerberos used to work fine. After upgrading both my TrueNAS SCALE to 25.10.0.1 and my Fedora client from version 42 to 43, I no longer have my user’s privileges when accessing NFS with Kerberos. I just have a small home setup with one Kerberos client only (and some other VMs using sec=sys). Mount works, but I effectively have the privileges of the nobody user. Here’s what I’ve checked so far: Kerberos authentication works with my KDC VM (client obtains nfs/<hostname>@REALM ticket) …

It seems this is definitely a bug and another workaround is to switch from gssproxy to rpc.svcgssd.