The following errors are observed in event log while Read is not processing messages. This results in no messages reaching Export queue:
Reader: sem_enter: sem_num = 1 semval = -1 semncnt = -1 semzcnt = -1 pid = -1 ctr = -1
Carry out the following steps to see if they resolve the issue:
1. Shutdown SharePlex (clean or forced shutdown)
2. If there is an orphaned Read process, kill it at OS prompt by:
3. $ kill -9 <PID of the orphaned Read process> (where $ denotes OS prompt)
4. Restart SharePlex
If this does not resolve the issue, try steps listed in solution # 22381
