Common Issues and Troubleshooting
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Authentication requires secure connection comes from how MySQL's default sign-in works: the first time it checks a password, it needs an encrypted connection to do it safely. Connecting over TCP with TLS turned off gets you this error, and the same command worked a minute later, which threw me at first.
Your password does not satisfy the current policy requirements means the validate_password component is on, and it doesn't like this password. The message doesn't say why, but the rules are one query away.
User 'inventory_app' has exceeded the 'max_user_connections' resource (current value: 2) means that one account has as many connections open as it's allowed. The number is in the message, so the question is who has them, and whether the limit is right.
ERROR 1142 (42000): DROP command denied to user means the account you're signed in with doesn't have that right on that table. If the account belongs to an app, that's often exactly what you want. And TRUNCATE gives the same message, which surprised me.
error 79 at 1 depth lookup: invalid CA certificate means the certificate you're checking is fine, and the problem is one level up: the CA that signed it isn't marked as a CA. Mine had lost its CA:TRUE because I'd run openssl with no configuration file.
docker compose up printed Recreate when I'd changed nothing, and then root's password stopped working. I had two projects open, and I'd exported one project's .env into my shell. Compose prefers the shell's variables over the .env file, so the other project's container got the wrong values.
not valid in this context is zsh refusing a variable name with a dot in it. ASP.NET Core log categories are full of dots, so to turn one down through an environment variable, export won't do. env will.
I used a TransactionScope once, and afterwards a plain query on the same pooled connection reported its isolation level as SERIALIZABLE. The scope's default level is Serializable, the driver sets it for the whole session, and nothing puts it back. Passing the level you want avoids all of it.
A request without my header got a 400 Bad Request with an empty explanation, and my endpoint never ran. The log had the reason: Required parameter "string source" was not provided from header. One ? decides whether a header is required.
I raised a value with ExecuteUpdateAsync, and read the product again, and got the old value back. The database had the new one. FirstAsync had gone to MySQL, read the new value, and then handed me the object it was already tracking, unchanged.
