Hi, I'm going crazy, I'm on it since yesterday morning. I have a certificate that I had to renew (at Namecheap), I was forced to reissue it because of a mistake (not from me but it's not important). Code: [Wed Oct 02 13:33:15 2013] [error] Unable to configure RSA server private key [Wed Oct 02 13:33:15 2013] [error] SSL Library Error: 185073780 error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch I tried this: Delete old certificates in the ispconfig panel Create a new command line csr (request) copy / paste the certificate and the intermediate certificate in ispconfig commit (save) Apache crashes I tried this: Copy and paste the old csr and obtain a new certificate Get the novelty crt and copy/paste in place of the former (editing file) Apache crashes I tried old way: Create a new csr, and obtain a new certificate modifying the vhost accordingly: <IfModule mod_ssl.c> SSLEngine on # SSLCertificateFile /var/www/clients/client0/web109/ssl/domain.crt # SSLCertificateKeyFile /var/www/clients/client0/web109/ssl/domain.key # SSLCACertificateFile /var/www/clients/client0/web109/ssl/domain.bundle SSLCertificateFile /etc/ssl/apache2/domain.crt SSLCertificateKeyFile /etc/ssl/apache2/domain.key SSLCertificateChainFile /etc/ssl/apache2/intermediate.crt </IfModule> Apache crashes I finally tried this: Create a new csr from my old key obtain a certificate and copy/paste in place of the former Apache crashes I know the topic has been discussed often... I read this: http://www.howtoforge.com/forums/showthread.php?t=53208 and this: http://www.howtoforge.com/forums/archive/index.php/t-59220.html And many more ... I do not see where is my mistake. I'm sure of course it's my fault, but I can't figure how I can get out of this problem. I don't understand why it is so complicated to flush old ssl configuration on ispconfig ? Some help to drive me out of this would be very nice! Laurent. (and sorry for my poor english...).