It looks like this is a known problem with Opera 12.16[1][2]. According to the linked thread, a workaround is to disable opera:config#SecurityPrefs|OCSPValidate

It looks like this is a known problem with Opera 12.16[1][2]. According to the linked thread, a workaround is to disable opera:config#SecurityPrefs|OCSPValidateCertificates (obviously not ideal). You might see if it is fixed in 12.17. I do get an OCSP response if I run: openssl s_client -connect takeitapart.com:443 -tls1_2 -tlsextdebug -status Qualys also shows OCSP is working (though seemingly not part of the A+ rating)[3]. 1. http://forums.opera.com/discussion/1773932/broken-websites-twitter-tumblr/p1 http://forums.opera.com/discussion/1773932/broken-websites-t... 2. https://www.google.com/search?{google:acceptedSuggestion}oq=opera+12.16+The+response+from+the+online+certificate+validation+(OCSP)+server+was+too+old&sourceid=chrome&ie=UTF-8&q=opera+12.16+The+response+from+the+online+certificate+validation+(OCSP)+server+was+too+old https://www.google.com/search?{google:acceptedSuggestion}oq=... 3. https://www.ssllabs.com/ssltest/analyze.html?d=takeitapart.com https://www.ssllabs.com/ssltest/analyze.html?d=takeitapart.c...