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Common Errors and their Meanings

DAQInterface

errno -111: Connection Refused

This error occurs when DAQInterface sends a transition command to an artdaq process.
It indicates that an exception occurred while processing the command, and it was not caught by error-handling code with artdaq.

artdaq System

Stop request received by RequestReceiver, but no requests have ever been received.
Did not receive acks from all senders after resending table <N> times during the table_update_interval. Check the status of the senders!

These issue can be caused by multicast messages not getting from their sources to their destinations. The requestSender and requestReceiver applications can be used to debug these issues.