MySQL raises ER_CHANGE_MASTER_PASSWORD_LENGTH (error 3056) when the password specified in a CHANGE MASTER TO or CHANGE REPLICATION SOURCE TO statement is longer than the allowed 32 characters.
ER_CHANGE_MASTER_PASSWORD_LENGTH (MySQL error 3056) appears when the replication user password supplied to CHANGE MASTER TO exceeds 32 characters. Shorten the password to 32 characters or less, update the replication configuration, and restart replication to resolve the issue.
ER_CHANGE_MASTER_PASSWORD_LENGTH
MySQL error 3056 appears during CHANGE MASTER TO or CHANGE REPLICATION SOURCE TO when the password string for the replication account is longer than 32 characters.
MySQL 5.7.5 and later enforce a 32-character limit on replication passwords. If the limit is breached, the server aborts the statement and surfaces ER_CHANGE_MASTER_PASSWORD_LENGTH.
The immediate cause is a password that exceeds 32 characters supplied in the MASTER_PASSWORD or SOURCE_PASSWORD option.
Automation that generates long random passwords, copy-and-paste errors, or upgrades from older versions that allowed longer passwords frequently trigger the fault.
Fixing the error requires shortening the replication user password to 32 characters or less, applying it with CHANGE MASTER TO, and restarting replication.
Always update the underlying user account with the same shorter password to maintain authentication consistency across master and replica hosts.
On initial replication setup, scripts may insert a 64-character password. Replace it with a 32-character value and issue START SLAVE.
After a version upgrade, re-run CHANGE MASTER TO with a compliant password to re-establish the connection.
Establish a password policy that caps replication passwords at 32 characters.
Store credentials in environment variables or secrets managers and validate length during CI/CD to catch violations before deployment.
ER_CHANGE_MASTER (HY000) indicates a general syntax or privilege problem in the same statement. Verify account privileges and statement syntax.
ER_MASTER_CERTIFICATE_LENGTH warns of over-long certificate data supplied to replication parameters; truncate or reference file paths instead.
The supplied MASTER_PASSWORD exceeds the length limit, triggering the error immediately.
Random generators in deployment scripts may default to 64-character strings, violating the MySQL limit.
Servers upgraded from a version that allowed long passwords attempt to reuse existing credentials and fail under the new restriction.
Accidental spaces appended to the password literal can push the effective length beyond 32 characters.
General failure in CHANGE MASTER TO due to syntax or privilege errors. Ensure correct options and adequate privileges.
Error reading master info repository, often caused by file permission or corruption issues.
Raised when certificate parameters exceed permitted length. Provide shorter strings or use file references.
No. The limit is hard-coded in the server source. Use a shorter password.
No. Only the password passed in CHANGE MASTER TO is restricted. User accounts themselves can have longer password hashes.
Yes. Galaxy's linting highlights replication statements with over-long passwords before execution, preventing runtime failure.
Yes. The replica must reconnect to the primary with the new password, which only occurs after STOP SLAVE and START SLAVE.
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