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

## SYSLOG Details
- **Message**: Unable to lock PID file: <variable>error-message</variable>
- **Help**: lacpd could not lock PID file
- **Description**: The Link Aggregation Control Protocol process (lacpd) attempted to lock the file that records its process ID (PID), which serves to prevent multiple instances of lacpd from running simultaneously. The attempt failed.
- **Type**: SNO: Should Not Occur
- **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=LACPD_PID_FILE_LOCK&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=LACPD_PID_FILE_LOCK&sw=Junos%20OS&rel=23.4R1)