EC
1251
MariaDBERRORNotableSyntax / VersionHIGH confidence

Command not allowed with this MySQL version

Production Risk

Medium — secure connections cannot be established.

What this means

ER_FEATURE_DISABLED (1251, SQLSTATE HY000) is raised when a feature or command is disabled in the current MySQL build or configuration. This is often seen with SSL connections when MySQL was compiled without SSL support.

Why it happens
  1. 1MySQL server compiled without SSL support but REQUIRE SSL is set for a user
  2. 2Attempting to use a feature that was disabled at compile time
How to reproduce
trigger — this will error
trigger — this will error
-- Connecting with SSL to a non-SSL build
mysql --ssl-mode=REQUIRED -u user -p  -- ERROR 1251

expected output

ERROR 1251 (HY000): The used command is not allowed because MySQL server is compiled without SSL support

Fix

Use a MySQL build with SSL support

Use a MySQL build with SSL support
-- Verify SSL support
SHOW VARIABLES LIKE 'have_ssl';

Why this works

Use an official MySQL binary or package that includes SSL. Community and Enterprise builds include SSL.

Sources
Official documentation ↗

MySQL 8.0 — 1251 ER_FEATURE_DISABLED

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