As of 17Feb2017 still get same result. Using Keychain Certificate Assistant, Evaluate Code Signing gives Evaluation Status: Invalid Extended Key Usage.
Get this in Console when I tried to load the site.
2/17/17 11:24:11.505 PM Console[10769]: Marker - Feb 17, 2017, 11:24:11 PM
2/17/17 11:24:18.071 PM com.avast.proxy[269]: SecTrustEvaluate(): online-go.com: 7
2/17/17 11:24:18.072 PM com.apple.WebKit.Networking[544]: CFNetwork SSLHandshake failed (-9806)
2/17/17 11:24:18.073 PM com.avast.proxy[269]: SSL_accept(): Broken pipe
2/17/17 11:24:18.089 PM com.avast.proxy[269]: SSL_accept(): inappropriate fallback
2/17/17 11:24:18.090 PM com.apple.WebKit.Networking[544]: CFNetwork SSLHandshake failed (-9802)
2/17/17 11:24:18.110 PM com.avast.proxy[269]: SSL_accept(): wrong version number
2/17/17 11:24:18.111 PM com.apple.WebKit.Networking[544]: CFNetwork SSLHandshake failed (-9824)
2/17/17 11:24:18.112 PM com.apple.WebKit.Networking[544]: NSURLConnection/CFURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9824)
2/17/17 11:24:18.119 PM com.avast.proxy[269]: SecTrustEvaluate(): online-go.com: 7
2/17/17 11:24:18.121 PM com.avast.proxy[269]: SSL_accept(): EOF