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My application holds between 950-970 SSL connections before it segfaults inside SSL_read . Is it possible to configure OpenSSL to accept more connections than this? I've programmed it to not do anything over the connections after acquiring them, so I know this is a function of # of open connections, not # of connections currently reading/writing or time. Updates: Same error on ubuntu at the same place. I'm working on ubuntu going forward. Same error if I double my machine size (RAM, swap, CPU) at the same number of connections. Context is not null. ulimit -n is set to 4096. I've verified this by also setting ulimit -100 , a different error is observed in that case. Issue happens even if threads are pooled. Issue happens at the same number of connections, whether there is 1 thread / connection or 1 thread / 10 connections. I am trying to build OpenSSL from source with debugging options enabled. I'm starting to wonder if this will take hours or tell me anything useful though. I have a question on that here. I've determined the segfault is happening on this line in openssl v 1.0.1.c: ssl_lib.c:968 968 return(s->method->ssl_read(s,buf,num)); Furthermore, I've determined that this is not segfaulting inside the ssl_read function (which ought to point to ssl3_read ). The member ssl_read of method is actually invalid itself and it appears method itself is also invalid (I'm inferring this on the basis of "strange looking address.")

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