# [ISFPJAD_PID_FILE_LOCK](https://apps.juniper.net/syslog-explorer/?msg=ISFPJAD_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 ISFPJAD is running
- **Description**: A file is created that contains the PID of current running ISFPJAD. This file must be locked when the PID is added 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=ISFPJAD_PID_FILE_LOCK&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=ISFPJAD_PID_FILE_LOCK&sw=Junos%20OS&rel=23.4R1)