Unable to move semaphore file.

Connected to 24x7 Scheduler Multi-platform Edition
Version: 4.3.293
System: Linux; JVM 1.5.0_22

I receive the following message in scheduler.log, when my job attempts to move a semaphore file before job execution;

"Unable to move semaphore file. Extended error: Could not move file /data/hqsq4/queue/test1.flag during 3 seconds."

I have specified that the semaphore file should just be moved to "/data/hqsq4/out", with no rename (yet).

The file "test1.flag" is a plain ascii text file, which has no oter processes attached to it.

Puzzled :-(

This message can appear in case a file copy operation fails. That could happen if the specified semaphore file is in use, or the target is not available. 3 seconds is an internal wait time. 24x7 reputedly attempting to copy the file. It gives up after 3 seconds