In cf2018, we had left Maximum number of simultaneous CFC function requests blank. On a new 2021 server, I did the same, no problem. On another new 2021 server, at first it said that's required to be numeric and greater than 0, then when I tried again, it just said "Important notice about last submission" with an orange exclamation graphic next to it, no actual text. Restarted cf, same. So: • WTH? • Assuming I actually do need to put something in there, which is probably a DOS countermeasure, any idea how to know what's better than the default, without load testing I don't have the time or reasonable parameters to do?

HI Dave - The maximum number of CFC requests should be number of cores X 4-6 depending on processor quantity, type, and overall request load. On quad processor boxes or larger I start with total cores * 5 + number of processors. So if you have a 4 processor box, each processor has 10 cores thats (200 total cores + 4 = 204

Thanks EW. These are all VMs, in dev, stage, and prod, I'd have to check about the effective number of cores. But if we haven't seen problems with the default settings, is it reasonable to leave this alone? Seems like it's a safety valve for not overloading the processor(s), which gut level, we're probably not in normal use. A DOS attack, dunno, but there are other levels of protection in play then too.

99 percent of the time, most apps never need this setting touched. Adobe defaults are usually more than enough to handle most production boxes, be it standard or enterprise.