I have a FreeBSD server with several NFSv4 shares. I have several linux clients (Ubuntu 12.04) that connect just fine and are able to use the NFS shares with 0 problems. But I’ve run into idmap problems with some newer linux distros ( Mint 16, Ubuntu 14.04 ) where chown as root sets file ownership as nobody (the idmap operation fails). Just to be clear, chown as root is working fine from the Ubuntu 12.04 machines. This poses a problem since some desktop GUIs like to do this sort of thing when creating config files in user home directories, and so user GUI logins fail. the logs have a lot of this: Apr 25 12:17:51 server rpc.idmapd[433]: nfs4_name_to_uid: calling nsswitch->name_to_uid Apr 25 12:17:51 server rpc.idmapd[433]: nss_getpwnam: name 'craigyk@xxxxxxxxx' domain 'nimgs.com': resulting localname 'craigyk' Apr 25 12:17:51 server rpc.idmapd[433]: nfs4_name_to_uid: nsswitch->name_to_uid returned 0 Apr 25 12:17:51 server rpc.idmapd[433]: nfs4_name_to_uid: final return value is 0 Apr 25 12:17:51 server rpc.idmapd[433]: Client 0: (user) name "craigyk@xxxxxxxxx" -> id "11115" ... Apr 25 12:18:03 server rpc.idmapd[433]: nfs4_name_to_uid: calling nsswitch->name_to_uid Apr 25 12:18:03 server rpc.idmapd[433]: nss_getpwnam: name '11115@xxxxxxxxx' domain 'nimgs.com': resulting localname '11115' Apr 25 12:18:03 server rpc.idmapd[433]: nss_getpwnam: name '11115' not found in domain 'nimgs.com' Apr 25 12:18:03 server rpc.idmapd[433]: nfs4_name_to_uid: nsswitch->name_to_uid returned -2 Apr 25 12:18:03 server rpc.idmapd[433]: nfs4_name_to_uid: final return value is -2 Apr 25 12:18:03 server rpc.idmapd[433]: Client 0: (user) name "11115@xxxxxxxxx" -> id "65534" I’ve tried almost everything I can think of. The users are being served from Samba4. The uid and gid are the same on all clients. Why is idmap trying to lookup the user id by it’s user id?-- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html