[Assist] Cannot connect to HTTPS Parabola website

[Francesco Turco]

I have been unable to connect to the HTTPS version of Parabola website
for the last few days. I get the following error message with Iceweasel
41.0.2:

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Secure Connection Failed

An error occurred during a connection to www.parabola.nu. The OCSP
server experienced an internal error. (Error code:
sec_error_ocsp_server_error)

The page you are trying to view cannot be shown because the authenticity
of the received data could not be verified.

Please contact the website owners to inform them of this problem.

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Is this a known problem?