# [COSD_RTSOCK_WRITE_FAILED](https://apps.juniper.net/syslog-explorer/?msg=COSD_RTSOCK_WRITE_FAILED)

## SYSLOG Details
- **Message**: rtslib_write() failed, error <variable>error-message</variable>
- **Help**: COSD failed to write onto rtsock socket
- **Description**: COSD uses rtsock to read/write data from kernel. If the write fails kernel returns an error.
- **Type**: Internal: Internal log message
- **Severity**: error
- **Cause**: An internal software failure occurred.
- **Action**: Contact your technical support representative.
- **Attributes**: error-message
- **Facility**: LOG_DAEMON

## Found this message in the following releases:
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=COSD_RTSOCK_WRITE_FAILED&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=COSD_RTSOCK_WRITE_FAILED&sw=Junos%20OS&rel=23.4R1)