{"record":{"id":"ee322aae5e9a4fdf","repo":"googleapis/mcp-toolbox","slug":"unable-to-connect-successfully-w-ee322a","errorCode":null,"errorMessage":"unable to connect successfully: %w","messagePattern":"unable to connect successfully: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/sources/mindsdb/mindsdb.go","lineNumber":73,"sourceCode":"\tPassword     string `yaml:\"password\"`\n\tDatabase     string `yaml:\"database\" validate:\"required\"`\n\tQueryTimeout string `yaml:\"queryTimeout\"`\n}\n\nfunc (r Config) SourceConfigType() string {\n\treturn SourceType\n}\n\nfunc (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {\n\tpool, err := initMindsDBConnectionPool(ctx, tracer, r.Name, r.Host, r.Port, r.User, r.Password, r.Database, r.QueryTimeout)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"unable to create pool: %w\", err)\n\t}\n\n\terr = pool.PingContext(ctx)\n\tif err != nil {\n\t\tpool.Close()\n\t\treturn nil, fmt.Errorf(\"unable to connect successfully: %w\", err)\n\t}\n\n\ts := &Source{\n\t\tConfig: r,\n\t\tPool:   pool,\n\t}\n\treturn s, nil\n}\n\nvar _ sources.Source = &Source{}\n\ntype Source struct {\n\tConfig\n\tPool *sql.DB\n}\n\nfunc (s *Source) IsReadOnly() bool {\n\treturn false","sourceCodeStart":55,"sourceCodeEnd":91,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/sources/mindsdb/mindsdb.go#L55-L91","documentation":"After successfully creating the pool, Initialize calls PingContext to verify a real connection can be established; failure means the pool exists but MindsDB rejected or timed out the connection. The pool is closed and initialization fails. This is distinct from pool-creation failure: auth or network problems happen at ping time.","triggerScenarios":"pool.PingContext(ctx) fails because credentials are wrong, the database name is unknown, the server is down/overloaded, or the context deadline (query timeout) expires before the handshake completes.","commonSituations":"Incorrect MindsDB user/password; database/project name not yet created in MindsDB; MindsDB container not ready at startup; firewall dropping the MySQL-protocol port.","solutions":["Verify user/password with a direct MySQL client against the MindsDB server","Confirm the configured database exists in MindsDB (SHOW DATABASES)","Increase the query timeout / extend the context deadline if pings time out under load","Ensure MindsDB is fully started and reachable before launching the toolbox"],"exampleFix":"// before\ndatabase: myproj  # not created yet\n// after\n# run in MindsDB: CREATE DATABASE myproj;\ndatabase: myproj","handlingStrategy":"retry","validationCode":"db, err := sql.Open(\"mysql\", dsn)\nif err != nil { return err }\nctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)\ndefer cancel()\nif err := db.PingContext(ctx); err != nil {\n    return fmt.Errorf(\"cannot reach mindsdb with given credentials: %w\", err)\n}","typeGuard":null,"tryCatchPattern":"err = pool.PingContext(ctx)\nif err != nil {\n    if mysqlErr, ok := err.(*mysql.MySQLError); ok && mysqlErr.Number == 1045 {\n        // access denied: fix user/password\n    }\n    // retry with backoff for transient failures\n}","preventionTips":["Create the database/project in MindsDB before wiring the config","Add a readiness check (ping) with backoff at startup for containerized MindsDB","Validate credentials with a mysql CLI one-liner before deploying"],"tags":["mindsdb","mysql","connection","authentication","timeout"],"backgroundTag":"connection-refused","analyzedSha":"8cc6e09de2ad7b8bffc77751799585a1401a48eb","analyzedAt":"2026-09-05T01:10:36.887Z","contentChangedAt":"2026-09-05T01:10:36.887Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}