I have just installed a letsencrypt certificate via the server certificate module on my Nethserver 7 (final version). It seems that it worked fine, i.e. the new certificate is shown in the list of certificates and no errors are shown in the log file. I set the certificate to default. However, when…

The real reason for that error was that my router from the ISP didn’t forward the port 443… simply a stupid failure in the configuration…! :wink: However, I found on the way towards the solution this guide for making a server much more secure against known SSL attacks: https://weakdh.org/sysadmin.h…

Letsencrypt certificate produces SSL error

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dnutan (Marc) February 2, 2017, 12:10am 2

You may try to increase apache (httpd) security.

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