LSLB - External processor unavailable?

Many, many times we have issues where it states external processor unavailable and it appears only when under a load. (Such as the LSLB process is around 8-9% cpu utilization)Speed Test essay writer

We have timeout settings set around 10, Keep Alive On, Smart Keep Alive Off.

Just can't figure it out but 503 errors randomly but becoming a real nuisance.

LSLB 1.6 / FreeBSD 7.1 32-bit

Server on the other end normally has less than 10-15 concurrent connections. Never any real load. It doesn't always appear to happen just to busy sites, just appears when LSLB gets busy. System dmesg shows no issues, we're far from running out of connections, memory, cpu, iowait is good.

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