Hi Henrik, Yes I tried that, but it didn't make any difference. The intermidiate certificate was still marked as invalid. Concerning my other question (about client authentication using certificates) Is there anything I need to patch to make this work? If there isn't ... what do I need to do to make this work? TIA Bert. "Henrik Nordstrom" <henrik@xxxxxxxxxxxxxxxxxxx> wrote in message news:1163021020.26249.32.camel@xxxxxxxxxxxxxxxxxxxxxx