The server received a command that the active pluggable protocol does not implement, so it aborts the request with error 3130 (SQLSTATE HY000).
MySQL error 3130 ER_PLUGGABLE_PROTOCOL_COMMAND_NOT_SUPPORTED appears when you send a SQL or COM command over a protocol (e.g., X Protocol) that does not support it. Switch to the classic MySQL protocol or upgrade/change the plugin to resolve the issue.
ER_PLUGGABLE_PROTOCOL_COMMAND_NOT_SUPPORTED
MySQL throws error 3130 when the server receives a command that the current pluggable transport protocol cannot interpret. MySQL 5.7.8 introduced pluggable protocols such as the X Plugin. Each protocol supports only a subset of server commands. Unsupported commands trigger this generic HY000 error.
The message often appears when a client library silently chooses the X Protocol port (33060) and then submits classic protocol commands like COM_QUERY or replication statements. Because the X Plugin knows nothing about them, it answers with error 3130.
Developers usually hit it while using MySQL Shell, MySQL Router, or custom connectors that default to X Protocol. Executing SHOW SLAVE STATUS, LOAD DATA, or replication commands through these channels fails. The same happens if Galaxy or any IDE opens an X Protocol session and the user sends a classic statement outside the JSON/X format.
Leaving the mismatch unresolved blocks replication setup, data loads, and administrative tasks. Applications may enter retry loops, wasting resources and flooding logs. Fixing the protocol mismatch restores normal operation and keeps connections predictable.
Clients connect to port 33060 (X Protocol) but send classic protocol commands intended for port 3306.
Statements like COM_REGISTER_SLAVE or CHANGE MASTER TO are issued over a plugin that does not implement replication features.
An outdated MySQL client library connects to a server that has only X Plugin enabled, leading to capability gaps.
MySQL Router forwards a connection to an X Plugin backend even though the session expected the classic protocol.
The prepared statement command is not supported by the current plugin.
The server received an unknown command identifier, often due to protocol mismatch.
Client uses an authentication method not supported by the server plugin.
No. The command itself is valid but the protocol handling it cannot process the command type.
Yes. Connect to the classic port or use the sql channel inside MySQL Shell so commands are routed correctly.
Upgrading alone may not help. The error disappears only when the protocol and command set align.
Galaxy detects the target port and protocol, warns when they do not match, and defaults to the classic protocol for SQL-heavy workflows.
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