Hello, i noticed, that your website is not sending the whole certificate chain.
so when accessing your website, browser warns about untrusted destination. when i try to see at it in detail...
openssl s_client -showcerts -connect savannah.nongnu.org:443
i see only one certificate, the cacert's cert missing.
Certificate chain 0 s:/CN=savannah.nongnu.org i:/O=Root CA/OU=http://www.cacert.org/CN=CA Cert Signing Authority/emailAddress=supp...@cacert.org
please add CA cert to your webserver configuratio, regards, -jhr. -- J.Horacek http://jhr.cz