How many concurrent connections can ACS handle at once?

Hi Experts,
Could you please let me know how many concurrent connections ACS can handle at once?
Is there any limitation on it?
Our ACS version is 4.0 (1) build 27.
Thanks in advance for your help and have a nice day!
Regards,
Gabor

It depends on many other factors but as far as I know ACS can handle upto 40 Auth request per second*
*Condition Apply
Regards,
~JG
Do rate helpful posts

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No, Im not saying ACS cannot cope.
Concurrency and latency are very different things. ACS CSTacacs can handle many 100s of simple authentications/authorisations per second with users in the internal database. If 1000s of devices all send traffic in the same instant it would take some seconds to work through the backlog of traffic.
Also, worth considering that a limited number of tasks within ACS (or threads) can actually handle a much greater number of "logins" because they are generally multi-message allowing ACS to keep lots of plates spinning.
If users are in an external databases the latency (per authentication) can increase depending on where the users are (eg Windows AD) and if bad enough can have a serious effect on the overall authentication rate. At which point customers normally turn to load balancing.
If your device timeouts are 20 seconds (totally reasonable) I suggest the issue is more likely to be something else... a bug, perhaps specific to v4.2?

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How many concurrent connections can ACS handle at once?

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