I'm trying to renew my SSL certificate for my 3cx phone system. Using the following guide https://www.3cx.com/docs/renewing-ssl-certificate/ I need to replace the cer and key files. When I download my new certificate from go daddy for IIS, I get a crt and a p7b file. Is the p7b (intermediate) file the key file? After I rename the files and restart the nginx server, I can no longer access my 3cx dashboard. I get the error "WARNINGS.WEB_SERVER_NOT_RESPONDING". But if I check I can see my new certificate is installed.