# TorError.ioError(_:) A POSIX I/O operation against the control socket or data directory failed. ``` case ioError(String) ``` ## Discussion Payload carries a combined description of the syscall + `errno` string (e.g. `"read: Connection reset by peer"`). Most commonly seen when Tor exits during an active control command or the data directory becomes unwritable. Not generally retryable; inspect the payload for classification.