IPCL-101 — The proxy cannot write its PID to the lock file
The proxy sometimes needs to perform synchronization of its processes, for example, when it accesses some shared memory or accepts client connections. Locking a shared lock file with flock() is used for this purpose. The lock file can be also used for obtaining PID of the proxy parent process, because this PID is stored in the lock file. If the PID cannot be written to the lock file, this message is logged, but the proxy continues normally.