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To test if your Linux setup has a heartbleed vulnerability in OpenSSL, you can try the following from the command line (terminal, shell):
openssl s_client -connect domain.com:443 -tlsextdebug 2>&1 | grep 'server extension "heartbeat" (id=15)' || echo safe
This SHOULD result in "safe", indicating that your setup is OK.
Some more info:
- Alternative way of testing can be done through this website: https://filippo.io/Heartbleed/
- More Heartbleed info can be found here: http://heartbleed.com/
