Merge branch '6458-let-s-encrypt-ssl-certs-not-issued-due-to-changed-cert-path-for-ecc-certs' into 'develop'

Resolve "Let's Encrypt SSL certs not issued due to changed cert path for ECC certs"

Closes #6458

See merge request ispconfig/ispconfig3!1691

Author: Till Brehm

install/lib/installer_base.lib.php

@@ -3145,11 +3145,11 @@ public function make_ispconfig_ssl_cert() {
 				$out = null;
 				$ret = null;
 				if($conf['nginx']['installed'] == true || $conf['apache']['installed'] == true) {
-					exec("$acme --issue --log $acme_log -w /usr/local/ispconfig/interface/acme -d " . escapeshellarg($hostname) . " $renew_hook", $out, $ret);
+					exec("$acme --issue --keylength 4096 --log $acme_log -w /usr/local/ispconfig/interface/acme -d " . escapeshellarg($hostname) . " $renew_hook", $out, $ret);
 				}
 				// Else, it is not webserver, so we use standalone
 				else {
-					exec("$acme --issue --log $acme_log --standalone -d " . escapeshellarg($hostname) . " $hook", $out, $ret);
+					exec("$acme --issue --keylength 4096 --log $acme_log --standalone -d " . escapeshellarg($hostname) . " $hook", $out, $ret);
 				}
 
 				if($ret == 0 || ($ret == 2 && file_exists($check_acme_file))) {