Thread:Support/View-pool-error/reply (5)

That message appears whenever something fails with the poolcounter. The text below ($1) should give out the exact reason (pool-timeout/pool-queuefull/pool-errorunknown). Note that a timeout or full queue would only produce that error if a fallback is not available either.

The problem of the screenshot, with connection timed out, and that Tim fixed is that the socket had attached a timeout shorter than the time the poolcounter forces it to wait (because another worker was rendering it).