Hi there, I have just compiled R 3.3.1 on my SuSE SLES 11 SP2 server. All works fine but I cannot use the install.packages function since there is an issue with the underlying curl command which requires a ca certificate in order to download files. 1: In download.file(url, destfile = f, quiet = TRUE) : URL 'https://cran.r-project.org/CRAN_mirrors.csv': status was 'Peer certificate cannot be authenticated with given CA certificates' Of course, the problem can be bypassed by manually installing packages by only using http:// instead of https:// links but I am hoping there is a more efficient solution for this problem. Can you help? Best wishes Kristian Arbeitsgruppenleiter Integrative Biologie / Head of Integrative Biology Group Stellvertretender Abteilungsleiter / Deputy Head of Research Unit Abteilung Strahlenzytogenetik / Research Unit Radiation Cytogenetics Tel.: +49-89-3187-3515 Skype: kristian.unger Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Dr. Alfons Enhsen Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671 [[alternative HTML version deleted]]