Listen queue overflow: 8 already in queue awaiting acceptance

kernel log messages:
> sonewconn: pcb 0xfffff800995fa3c0: Listen queue overflow: 8 already in queue awaiting acceptance (6 occurrences)
> sonewconn: pcb 0xfffff800995fa3c0: Listen queue overflow: 8 already in queue awaiting acceptance (3 occurrences)
-- End of security output --

What does this mean, how to proceed?