[Privoxy-users] Max-client-connections fatal error

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I installed privoxy 3.0.26 from source(downloaded from SourceFourge) on remote server under Ubuntu 16.04. I built it with --with-fdsetsize=64000 key.max-client-connections is set to 5000When I run in terminalprivoxy config (im currently in /usr/local/etc/privoxy), it fails with the message:2018-09-27 03:34:23.806 7f9774965700 Fatal error: max-client-connections value 5000 is invalid. Value needs to be above 1 and below 512 (FD_SETSIZE/2)I found no information in user manual about what systems support FD_SETSIZE above 1024.Please help me figure out how to make Privoxy to keep more than 512 open connections. What OS should I use?PS.I tried to increase maximum number of open files following steps from this manual https://underyx.me/2015/05/18/raising-the-maximum-number-of-file-descriptorsulimit -n displays 64000 but it actually has no effect