Sets whether GSSAPI user names should be treated case-insensitively.
At a glance
| Property | Value |
|---|---|
| Parameter | krb_caseins_users |
| Category | Connections and Authentication |
| Default | off |
| Value type | boolean (on/off) |
| Change scope | Reload (postgresql.conf, SIGHUP) |
| Available in | PostgreSQL 12, 13, 14, 15, 16, 17, 18, 19 (added in 12) |
What it does
Sets whether GSSAPI user names should be treated case-insensitively. The default is off (case sensitive). This parameter can only be set in the postgresql.conf file or on the server command line.
(Description quoted from the official PostgreSQL documentation.)
How to apply a change
Set it in postgresql.conf (or with ALTER SYSTEM) and reload with SELECT pg_reload_conf(); or pg_ctl reload — no restart needed.
Inspect the current value and source with SHOW krb_caseins_users; or SELECT name, setting, unit, context, source FROM pg_settings WHERE name = 'krb_caseins_users';.
Tuning guidance
This is a connectivity or security setting, not a performance knob. Choose the value from your security and network requirements (TLS files, ciphers, keepalives, authentication behaviour) rather than for throughput, and verify it against your organization’s policy. Test changes in staging, because a wrong value here can lock clients out.