I confirm that what Narcissus wrote. Copying the ca-bundle.crt in /var/lib/boinc-client/ca-bundle.crt solves the problem. This file ist linked to the /etc/ssl/ca-certificates.crt file.
I confirm that what Narcissus wrote. Copying the ca-bundle.crt in /var/lib/ boinc-client/ ca-bundle. crt solves the problem. This file ist linked to the /etc/ssl/ ca-certificates .crt file.