The SSLv2/SSLv3 protocol is enabled on the NetScaler virtual server, however the SSL checker shows it as disabled.
To resolve this issue, disable SNI on NetScaler, as SNI is a TLS extension.
Note: According to RFC6176 from Internet Engineering Task Force (ITEF), TLS servers must not support SSLv2. The NetScaler appliance does not support SSLv2 from release 12.1.