I am trying build 1.6 from source and intermittently getting the following error: # wget -O - https://files.freeswitch.org/repo/deb/debian/freeswitch_archive_g0.pub | apt-key add - converted 'https://files.freeswitch.org/repo/deb/debian/freeswitch_archive_g0.pub' (ANSI_X3.4-1968) -> 'https://files.freeswitch.org/repo/deb/debian/freeswitch_archive_g0.pub' (UTF-8) --2017-04-26 18:25:04-- https://files.freeswitch.org/repo/deb/debian/freeswitch_archive_g0.pub Resolving files.freeswitch.org (files.freeswitch.org)... 209.105.235.7, 2607:f348:1021::7 Connecting to files.freeswitch.org (files.freeswitch.org)|209.105.235.7|:443... connected. GnuTLS: A TLS warning alert has been received. GnuTLS: received alert [112]: The server name sent was not recognized ERROR: The certificate of 'files.freeswitch.org' is not trusted. ERROR: The certificate of 'files.freeswitch.org' hasn't got a known issuer. Any ideas?