While troubleshooting a problem related to TLS/SSLv2/SSLv3, I’e found out, that for security reasons, all support for SSLv2 on Ubuntu’s openssl package was removed.
Check out this: http://security.sunera.com/2011_02_01_archive.html for more information. This is very important if using Ubuntu as the OS for running vulnerability scanning, because the lack of SSLv2 support from Ubuntu’s openssl package will always give false negative results for a site with enabled SSLv2 support…
So if there is the need to check for SSLv2 support and or SSLv2 vulnerability scanning using Ubuntu as the host OS, then download, compile and use the OpenSSL sources.
Just for reference: How to check for:
TLS -> openssl s_client -tls1 -connect 10.0.0.0:443
SSLv2 -> openssl s_client -ssl2 -connect 10.0.0.0:443
SSLv3 -> openssl s_client -ssl3 -connect 10.0.0.0 -port 443 -showcerts