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

## SYSLOG Details
- **Message**: Unable to lock PID file: <variable>error-message</variable>
- **Help**: Unable to lock PID file that ensures only one imond is running
- **Description**: A file containing the PID of current running imond is created. This file must be locked while adding the PID to the file. System call to lock this file failed.
- **Type**: Internal: Internal log message
- **Severity**: error
- **Cause**: -
- **Action**: -
- **Attributes**: error-message
- **Facility**: LOG_DAEMON

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