Hi, I have a domain d.com with only 2 servers in it. The first is the domain controller with Exchange2000 on it (I know it's not good, but I was forced to do it... and it will change in a while), the other a SQL2000 server. In order to be able to connect my Exchg2000 to the outside world, I have installed a single server (not in the domain) with ISA SP1 on it. I configured it as I can, and all my needs were ok with it. For example, I published my web site for OWA, and it worked (https). But since few days, I have this message when I try to connect to my OWA through https: 500 Internal Server Error - The target principal name is incorrect. (-2146893022) Internet Security and Acceleration Server I read mails from this list about it, and no-one solved my problem. I look after information on the Net, but nothing helps me... So, pleeeeeeeeeeeaaaaaaaaassssse, can anybody help me, I can't access my OWA and we need it... Thanks in advance Thierry