Security enhancements in OS X Yosemite v10.10.4 and iOS 8.4 help protect against important security vulnerabilities. If a webpage is on a server that doesn't meet secure cryptographic standards:
- Safari will say that it will not open the website because it's using weak encryption.
- Or Safari will say that it can't open the page because Safari can't establish a secure connection to the server.
To resolve the issue, the website administrator should configure their server to be secure.