- check that IO::Socket::SSL and Net::SSLeay are properly installed, and that the versions are recently new: perl -MIO::Socket::SSL -e 'print "$IO::Socket::SSL::VERSION\n"' perl -MNet::SSLeay -e 'print "$Net::SSLeay::VERSION\n"' - run the tests in IO::Socket::SSL directory try running the tests with 'make test'. if some of the tests fail run the scripts one by one e.g.: perl -Ilib t/core.t - try running the demos using the DEBUG option - use the OpenSSL client and server for debugging the demo client and server. 'openssl s_client' and 'openssl s_server' against tests/demos testing the demo server: openssl s_client -connect localhost:9000 \ -key certs/client-key.pem -cert certs/client-cert.pem -verify 1 testing the demo client: openssl s_server -accept 9000 \ -key certs/server-key.pem -cert certs/server-cert.pem -verify 1 also, try these commands without the verify argument.