> I am trying to execute the check_server_certificate.py and I am getting this 
> error… can you guys help me figure out whats going on? its the exact sample 
> code on the website running on Ubuntu 14.04.

Trusty is shipping Twisted 13.2 which doesn't have vital TLS improvements that 
arrived with 14.0 and that are used in said example.

I strongly recommend against using Twisted older than 14.0 for code involving 
TLS.  Please use the version from PyPI (14.0.2).
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