$portused = openvpn_port_used($pconfig['protocol'], $pconfig['interface'], $pconfig['local_port'], $vpnid);
     if ($portused != $vpnid && $portused != 0) {
         $input_errors[] = gettext("The specified 'Local port' is in use. Please select another value");
     }
 }
 if ($result = openvpn_validate_host($pconfig['server_addr'], 'Server host or address')) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_port($pconfig['server_port'], 'Server port')) {
     $input_errors[] = $result;
 }
 if ($pconfig['proxy_addr']) {
     if ($result = openvpn_validate_host($pconfig['proxy_addr'], 'Proxy host or address')) {
         $input_errors[] = $result;
     }
     if ($result = openvpn_validate_port($pconfig['proxy_port'], 'Proxy port')) {
         $input_errors[] = $result;
     }
     if ($pconfig['proxy_authtype'] != "none") {
         if (empty($pconfig['proxy_user']) || empty($pconfig['proxy_passwd'])) {
             $input_errors[] = gettext("User name and password are required for proxy with authentication.");
         }
     }
 }
 if ($pconfig['tunnel_network']) {
     if ($result = openvpn_validate_cidr($pconfig['tunnel_network'], 'IPv4 Tunnel Network', false, "ipv4")) {
         $input_errors[] = $result;
     }
 }
 if ($pconfig['tunnel_networkv6']) {
     if ($result = openvpn_validate_cidr($pconfig['tunnel_networkv6'], 'IPv6 Tunnel Network', false, "ipv6")) {

 if (!empty($pconfig['ntp_server3']) && !is_ipaddr(trim($pconfig['ntp_server3']))) {
     $input_errors[] = gettext("The field 'NTP Server #3' must contain a valid IP address");
 }
 if (!empty($pconfig['ntp_server4']) && !is_ipaddr(trim($pconfig['ntp_server4']))) {
     $input_errors[] = gettext("The field 'NTP Server #4' must contain a valid IP address");
 }
 if (!empty($pconfig['wins_server_enable'])) {
     if (!empty($pconfig['wins_server1']) && !is_ipaddr(trim($pconfig['wins_server1']))) {
         $input_errors[] = gettext("The field 'WINS Server #1' must contain a valid IP address");
     }
     if (!empty($pconfig['wins_server2']) && !is_ipaddr(trim($pconfig['wins_server2']))) {
         $input_errors[] = gettext("The field 'WINS Server #2' must contain a valid IP address");
     }
 }
 if (!empty($pconfig['client_mgmt_port_enable'])) {
     if ($result = openvpn_validate_port($pconfig['client_mgmt_port'], 'Client management port')) {
         $input_errors[] = $result;
     }
 }
 if (!empty($pconfig['maxclients']) && !is_numeric($pconfig['maxclients'])) {
     $input_errors[] = gettext("The field 'Concurrent connections' must be numeric.");
 }
 /* If we are not in shared key mode, then we need the CA/Cert. */
 if (isset($pconfig['mode']) && $pconfig['mode'] != "p2p_shared_key") {
     $reqdfields = explode(" ", "caref certref");
     $reqdfieldsn = array(gettext("Certificate Authority"), gettext("Certificate"));
 } elseif (empty($pconfig['autokey_enable'])) {
     /* We only need the shared key filled in if we are in shared key mode and autokey is not selected. */
     $reqdfields = array('shared_key');
     $reqdfieldsn = array(gettext('Shared key'));
 }

 $pconfig = $_POST;
 if (isset($id) && $a_server[$id]) {
     $vpnid = $a_server[$id]['vpnid'];
 } else {
     $vpnid = 0;
 }
 if ($pconfig['mode'] != "p2p_shared_key") {
     $tls_mode = true;
 } else {
     $tls_mode = false;
 }
 if (empty($pconfig['authmode']) && ($pconfig['mode'] == "server_user" || $pconfig['mode'] == "server_tls_user")) {
     $input_errors[] = gettext("You must select a Backend for Authentication if the server mode requires User Auth.");
 }
 /* input validation */
 if ($result = openvpn_validate_port($pconfig['local_port'], 'Local port')) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['tunnel_network'], 'Tunnel network')) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['remote_network'], 'Remote network')) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['local_network'], 'Local network')) {
     $input_errors[] = $result;
 }
 $portused = openvpn_port_used($pconfig['protocol'], $pconfig['local_port']);
 if ($portused != $vpnid && $portused != 0) {
     $input_errors[] = gettext("The specified 'Local port' is in use. Please select another value");
 }