Hello, I'm on ISPConfig 3 with a multisite serveur, i have receive a .cer and a .key for install a private ssl for one website and i don't know you i can do this ? Thank you very much for help.
usually you go to your website in ISPConfig, go to SSL tab and put the contents of the files to the according text-areas. You don't need to enter credentials if you don't want to make a new ssl-cert-request no need to fill out bundle-data if you don't have bundle. crt is pronounced cert
if you had letsencrypt activated previously you should disable the letsencrypt checkbox first + save afterwards you put in the data you got from your issuer on ssl tab. ( from my mind, might actual be slightly different, worst case try disabling ssl all together and start enabling ssl again ).
