MariaDB node replaces client request for host 127.0.0.1 with localhost

This seems very strange: I have a MariaDB Galera cluster with three nodes, and each node has virtually the same configuration. Since it's a Galera cluster, the database users are the same across all three nodes. On node 1 and node 2 I get the expected hostname for the user: mariadb --no-defaults -utheusername -p'thepassword' -h127.0.0.1 -e"select user()" +-----------------------+ | user() | +-----------------------+ | theusername@127.0.0.1 | +-----------------------+ However, on the third node it always ignores the request to use host 127.0.0.1 and replaces this with localhost: mariadb --no-defaults -utheusername -p'thepassword' -h127.0.0.1 -e"select user()" +-----------------------+ | user() | +-----------------------+ | theusername@localhost | +-----------------------+ If I instead log in interactively (remove the -e option) and run the status command, it shows that the connection is over TCP/IP (not socket although the user's host is still localhost) on all the nodes: Connection: 127.0.0.1 via TCP/IP What could be the reason for this?