diff --git a/pandora_console/extensions/agents_modules.php b/pandora_console/extensions/agents_modules.php
index 5565a9fe78..3c5defe04d 100644
--- a/pandora_console/extensions/agents_modules.php
+++ b/pandora_console/extensions/agents_modules.php
@@ -664,7 +664,7 @@ function mainAgentsModules()
             $name = $module;
             $modules_by_name[$cont]['name'] = $name;
             $modules_by_name[$cont]['id'][] = $key;
-            $cont ++;
+            $cont++;
         }
     }
 
diff --git a/pandora_console/extras/mr/50.sql b/pandora_console/extras/mr/50.sql
index 0ab1cb6387..2cf49fd3ac 100644
--- a/pandora_console/extras/mr/50.sql
+++ b/pandora_console/extras/mr/50.sql
@@ -124,4 +124,7 @@ INSERT IGNORE INTO `tncm_script` VALUES
 
 INSERT INTO `tncm_template_scripts`(`id_template`, `id_script`) VALUES (1,1),(1,2),(1,3),(1,4),(1,5);
 
+ALTER TABLE `tevent_alert` ADD COLUMN `last_evaluation` bigint(20) NOT NULL default 0;
+ALTER TABLE `tevent_alert` ADD COLUMN `pool_occurrences` int unsigned not null default 0;
+
 COMMIT;
diff --git a/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql b/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql
index b5e340c1dc..2762672e09 100644
--- a/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql
+++ b/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql
@@ -712,6 +712,8 @@ ALTER TABLE `tevent_alert` MODIFY COLUMN `time_threshold` int(10) NOT NULL defau
 ALTER TABLE `tevent_alert` ADD COLUMN `disable_event` tinyint(1) DEFAULT 0;
 ALTER TABLE `tevent_alert` ADD COLUMN `id_template_conditions` int(10) unsigned NOT NULL default 0;
 ALTER TABLE `tevent_alert` ADD COLUMN `id_template_fields` int(10) unsigned NOT NULL default 0;
+ALTER TABLE `tevent_alert` ADD COLUMN `last_evaluation` bigint(20) NOT NULL default 0;
+ALTER TABLE `tevent_alert` ADD COLUMN `pool_occurrences` int unsigned not null default 0;
 
 -- -----------------------------------------------------
 -- Table `tevent_alert_action`
diff --git a/pandora_console/godmode/massive/massive_add_profiles.php b/pandora_console/godmode/massive/massive_add_profiles.php
index f1903b83de..71a0b6777a 100644
--- a/pandora_console/godmode/massive/massive_add_profiles.php
+++ b/pandora_console/godmode/massive/massive_add_profiles.php
@@ -85,7 +85,7 @@ if ($create_profiles) {
                         );
                         $return = profile_create_user_profile($user, $profile, $group);
                         if ($return !== false) {
-                            $n_added ++;
+                            $n_added++;
                         }
                     }
                 }
diff --git a/pandora_console/godmode/massive/massive_operations.php b/pandora_console/godmode/massive/massive_operations.php
index 23693a5d4b..547ced655c 100755
--- a/pandora_console/godmode/massive/massive_operations.php
+++ b/pandora_console/godmode/massive/massive_operations.php
@@ -219,7 +219,8 @@ $alertstab = [
             'title' => __('Alerts operations'),
             'class' => 'invert_filter',
         ]
-    ).'</a>', 'active' => $tab == 'massive_alerts',
+    ).'</a>',
+    'active' => $tab == 'massive_alerts',
 ];
 
 $userstab = [
@@ -230,7 +231,8 @@ $userstab = [
             'title' => __('Users operations'),
             'class' => 'invert_filter',
         ]
-    ).'</a>', 'active' => $tab == 'massive_users',
+    ).'</a>',
+    'active' => $tab == 'massive_users',
 ];
 
 $agentstab = [
@@ -241,7 +243,8 @@ $agentstab = [
             'title' => __('Agents operations'),
             'class' => 'invert_filter',
         ]
-    ).'</a>', 'active' => $tab == 'massive_agents',
+    ).'</a>',
+    'active' => $tab == 'massive_agents',
 ];
 
         $modulestab = [
@@ -252,7 +255,8 @@ $agentstab = [
                     'title' => __('Modules operations'),
                     'class' => 'invert_filter',
                 ]
-            ).'</a>', 'active' => $tab == 'massive_modules',
+            ).'</a>',
+            'active' => $tab == 'massive_modules',
         ];
 
         $pluginstab = [
@@ -263,7 +267,8 @@ $agentstab = [
                     'title' => __('Plugins operations'),
                     'class' => 'invert_filter',
                 ]
-            ).'</a>', 'active' => $tab == 'massive_plugins',
+            ).'</a>',
+            'active' => $tab == 'massive_plugins',
         ];
 
         $policiestab = enterprise_hook('massive_policies_tab');
diff --git a/pandora_console/godmode/reporting/reporting_builder.item_editor.php b/pandora_console/godmode/reporting/reporting_builder.item_editor.php
index aaed1b0137..b0caf02af0 100755
--- a/pandora_console/godmode/reporting/reporting_builder.item_editor.php
+++ b/pandora_console/godmode/reporting/reporting_builder.item_editor.php
@@ -3772,23 +3772,23 @@ function print_SLA_list($width, $action, $idItem=null)
                                         ],
                                     ]
                                 );
-                        if (!empty($services_tmp)
-                            && $services_tmp != ENTERPRISE_NOT_HOOK
-                        ) {
-                            foreach ($services_tmp as $service) {
-                                $check_module_sla = modules_check_agentmodule_exists(
-                                    $service['sla_id_module']
-                                );
-                                $check_module_sla_value = modules_check_agentmodule_exists(
-                                    $service['sla_value_id_module']
-                                );
-                                if ($check_module_sla
-                                    && $check_module_sla_value
+                                if (!empty($services_tmp)
+                                    && $services_tmp != ENTERPRISE_NOT_HOOK
                                 ) {
-                                    $services[$service['id']] = $service['name'];
+                                    foreach ($services_tmp as $service) {
+                                        $check_module_sla = modules_check_agentmodule_exists(
+                                            $service['sla_id_module']
+                                        );
+                                        $check_module_sla_value = modules_check_agentmodule_exists(
+                                            $service['sla_value_id_module']
+                                        );
+                                        if ($check_module_sla
+                                            && $check_module_sla_value
+                                        ) {
+                                            $services[$service['id']] = $service['name'];
+                                        }
+                                    }
                                 }
-                            }
-                        }
 
                                 echo '<td class="sla_list_service_col">';
                                 echo html_print_select(
diff --git a/pandora_console/godmode/servers/modificar_server.php b/pandora_console/godmode/servers/modificar_server.php
index d1ac51b279..d0bc6d791b 100644
--- a/pandora_console/godmode/servers/modificar_server.php
+++ b/pandora_console/godmode/servers/modificar_server.php
@@ -231,8 +231,8 @@ if (isset($_GET['server'])) {
 <script language="javascript" type="text/javascript">
 
 $(document).ready (function () {
-    var id_server = <?php echo $id_server; ?>;
-    var server_type = <?php echo $row['server_type']; ?>;
+    var id_server = '<?php echo $id_server; ?>';
+    var server_type = '<?php echo $row['server_type']; ?>';
     $("#check_exec_server img").on("click", function () {
         $("#check_exec_server img").attr("src", "images/spinner.gif");
 
diff --git a/pandora_console/godmode/wizards/DiscoveryTaskList.class.php b/pandora_console/godmode/wizards/DiscoveryTaskList.class.php
index 3235e2dd6a..1c7149588c 100644
--- a/pandora_console/godmode/wizards/DiscoveryTaskList.class.php
+++ b/pandora_console/godmode/wizards/DiscoveryTaskList.class.php
@@ -178,7 +178,8 @@ class DiscoveryTaskList extends HTML
                             'attributes' => 'class="sub cancel"',
                             'return'     => true,
                         ],
-                    ],[
+                    ],
+                    [
                         'class'     => 'action-buttons rule-builder-actions',
                         'arguments' => [
                             'name'       => 'refresh',
diff --git a/pandora_console/include/class/CredentialStore.class.php b/pandora_console/include/class/CredentialStore.class.php
index e0d9022c28..718ebe7d4a 100644
--- a/pandora_console/include/class/CredentialStore.class.php
+++ b/pandora_console/include/class/CredentialStore.class.php
@@ -149,7 +149,7 @@ class CredentialStore extends Wizard
      * @param string $ajax_controller Path of ajaxController, is the 'page'
      *                               variable sent in ajax calls.
      *
-     * @return Object
+     * @return object
      */
     public function __construct($ajax_controller)
     {
diff --git a/pandora_console/include/constants.php b/pandora_console/include/constants.php
index a1d09d9148..2e62f25d59 100644
--- a/pandora_console/include/constants.php
+++ b/pandora_console/include/constants.php
@@ -425,6 +425,7 @@ define('SERVER_TYPE_SYSLOG', 18);
 define('SERVER_TYPE_AUTOPROVISION', 19);
 define('SERVER_TYPE_MIGRATION', 20);
 define('SERVER_TYPE_ALERT', 21);
+define('SERVER_TYPE_CORRELATION', 22);
 define('SERVER_TYPE_NCM', 23);
 
 // REPORTS.
diff --git a/pandora_console/include/functions.php b/pandora_console/include/functions.php
index 5c03154655..1df3f77670 100644
--- a/pandora_console/include/functions.php
+++ b/pandora_console/include/functions.php
@@ -2092,7 +2092,7 @@ function get_snmpwalk(
     $snmpwalk = [];
 
     // Check if OID is available.
-    if (count($output) == 1 && strpos($output[0], "No Such Object available on this agent at this OID") !== false) {
+    if (count($output) == 1 && strpos($output[0], 'No Such Object available on this agent at this OID') !== false) {
         return $snmpwalk;
     }
 
diff --git a/pandora_console/include/functions_netflow.php b/pandora_console/include/functions_netflow.php
index e9f521380c..60229d79ae 100644
--- a/pandora_console/include/functions_netflow.php
+++ b/pandora_console/include/functions_netflow.php
@@ -573,7 +573,7 @@ function netflow_get_data(
 
                 while ($pos > 0) {
                     $number = ($number * 1000);
-                    $pos --;
+                    $pos--;
                 }
 
                 $values['data'][$interval_end][$line['agg']] = $number;
diff --git a/pandora_console/include/functions_reporting.php b/pandora_console/include/functions_reporting.php
index 5b24d9e166..a1a5c3b68e 100755
--- a/pandora_console/include/functions_reporting.php
+++ b/pandora_console/include/functions_reporting.php
@@ -2702,7 +2702,7 @@ function reporting_agent_module($report, $content)
     foreach ($modules as $modul_id) {
         $modules_by_name[$cont]['name'] = io_safe_output(modules_get_agentmodule_name($modul_id));
         $modules_by_name[$cont]['id'] = $modul_id;
-        $cont ++;
+        $cont++;
     }
 
     if ($modules_by_name == false || $agents == false) {
@@ -14153,31 +14153,31 @@ function reporting_module_histogram_graph($report, $content, $pdf=0)
                     $array_graph[$data_total]['data'] = AGENT_MODULE_STATUS_NOT_INIT;
                     // NOT INIT.
                     $time_not_init = ($time_not_init + ($tend - $tstart));
-                    $data_not_init ++;
+                    $data_not_init++;
                 } else if ($tacum_data === null) {
                     $array_graph[$data_total]['data'] = AGENT_MODULE_STATUS_UNKNOWN;
                     // UNKNOWN.
                     $time_unknown = ($time_unknown + ($tend - $tstart));
-                    $data_unknown ++;
+                    $data_unknown++;
                 } else if (( (isset($min_value_critical) || isset($max_value_critical)) && ($modules_is_string === false) && ($sla_check_value_critical == true) )
                     || ( isset($max_value_critical) && ($modules_is_string === true) && $string_check_value_critical )
                 ) {
                     $array_graph[$data_total]['data'] = AGENT_MODULE_STATUS_CRITICAL_BAD;
                     // CRITICAL.
                     $time_critical = ($time_critical + ($tend - $tstart));
-                    $data_critical ++;
+                    $data_critical++;
                 } else if (( (isset($min_value_warning) || isset($max_value_warning)) && ($modules_is_string === false) && ($sla_check_value_warning == true) )
                     || ( isset($max_value_warning) && ($modules_is_string === true) && $sla_check_value_warning )
                 ) {
                     $array_graph[$data_total]['data'] = AGENT_MODULE_STATUS_WARNING;
                     // WARNING.
                     $time_warning = ($time_warning + ($tend - $tstart));
-                    $data_warning ++;
+                    $data_warning++;
                 } else {
                     $array_graph[$data_total]['data'] = AGENT_MODULE_STATUS_NORMAL;
                     // OK.
                     $time_ok = ($time_ok + ($tend - $tstart));
-                    $data_ok ++;
+                    $data_ok++;
                 }
 
                 $array_graph[$data_total]['utimestamp'] = ($tend - $tstart);
diff --git a/pandora_console/include/functions_servers.php b/pandora_console/include/functions_servers.php
index 45c3b2508f..635281b308 100644
--- a/pandora_console/include/functions_servers.php
+++ b/pandora_console/include/functions_servers.php
@@ -696,6 +696,19 @@ function servers_get_info($id_server=-1)
                 $id_modulo = 2;
             break;
 
+            case SERVER_TYPE_CORRELATION:
+                $server['img'] = html_print_image(
+                    'images/lightning_go.png',
+                    true,
+                    [
+                        'title' => __('Correlation server'),
+                        'class' => 'invert_filter',
+                    ]
+                );
+                $server['type'] = 'correlation';
+                $id_modulo = 0;
+            break;
+
             case SERVER_TYPE_ENTERPRISE_ICMP:
                 $server['img'] = html_print_image(
                     'images/network.png',
diff --git a/pandora_console/operation/users/user_edit.php b/pandora_console/operation/users/user_edit.php
index c18c8a103e..8434f34873 100644
--- a/pandora_console/operation/users/user_edit.php
+++ b/pandora_console/operation/users/user_edit.php
@@ -549,13 +549,13 @@ $table_ichanges = '<div class="autorefresh_select">
                         </div>
                         <div class="autorefresh_select_arrows" style="display:grid">
                             <a href="javascript:">'.html_print_image(
-    'images/darrowright_green.png',
-    true,
-    [
-        'id'    => 'right_autorefreshlist',
-        'alt'   => __('Push selected pages into autorefresh list'),
-        'title' => __('Push selected pages into autorefresh list'),
-    ]
+                                'images/darrowright_green.png',
+                                true,
+                                [
+                                    'id'    => 'right_autorefreshlist',
+                                    'alt'   => __('Push selected pages into autorefresh list'),
+                                    'title' => __('Push selected pages into autorefresh list'),
+                                ]
 ).'</a>
                             <a href="javascript:">'.html_print_image(
     'images/darrowleft_green.png',
diff --git a/pandora_console/pandoradb.sql b/pandora_console/pandoradb.sql
index 8184aea917..60393fa99a 100644
--- a/pandora_console/pandoradb.sql
+++ b/pandora_console/pandoradb.sql
@@ -3022,6 +3022,8 @@ CREATE TABLE IF NOT EXISTS `tevent_alert` (
 	`disable_event` tinyint(1) default 0,
 	`id_template_conditions` int(10) unsigned NOT NULL default 0,
 	`id_template_fields` int(10) unsigned NOT NULL default 0,
+	`last_evaluation` bigint(20) NOT NULL default 0,
+	`pool_occurrences` int unsigned not null default 0,
 	PRIMARY KEY  (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
diff --git a/pandora_server/conf/pandora_server.conf.new b/pandora_server/conf/pandora_server.conf.new
index 7bb61d25a8..d66de48423 100644
--- a/pandora_server/conf/pandora_server.conf.new
+++ b/pandora_server/conf/pandora_server.conf.new
@@ -478,6 +478,14 @@ export_threads 1
 
 eventserver 0
 
+# Enable (1) or disable (0) Pandora FMS Correlation Server (PANDORA FMS ENTERPRISE ONLY).
+
+correlationserver 0
+
+# Time in seconds to re-evaluate correlation alerts pool (PANDORA FMS ENTERPRISE ONLY).
+
+correlation_threshold 30
+
 # Correlated alerts, event window in seconds (3600 by default) (PANDORA FMS ENTERPRISE ONLY).
 
 event_window 3600
diff --git a/pandora_server/lib/PandoraFMS/Config.pm b/pandora_server/lib/PandoraFMS/Config.pm
index cf53eb2a3e..5ae6df60b2 100644
--- a/pandora_server/lib/PandoraFMS/Config.pm
+++ b/pandora_server/lib/PandoraFMS/Config.pm
@@ -305,6 +305,8 @@ sub pandora_load_config {
 	$pa_config->{"google_maps_description"} = 0;
 	$pa_config->{'openstreetmaps_description'} = 0;
 	$pa_config->{"eventserver"} = 1; # 4.0
+	$pa_config->{"correlationserver"} = 0; # 757
+	$pa_config->{"correlation_threshold"} = 30; # 757
 	$pa_config->{"event_window"} = 3600; # 4.0
 	$pa_config->{"log_window"} = 3600; # 7.741
 	$pa_config->{"elastic_query_size"} = 10; # 7.754 Elements per request (ELK)
@@ -793,6 +795,12 @@ sub pandora_load_config {
 		elsif ($parametro =~ m/^eventserver\s+([0-9]*)/i) {
 			$pa_config->{'eventserver'}= clean_blank($1);
 		}
+		elsif ($parametro =~ m/^correlationserver\s+([0-9]*)/i) {
+			$pa_config->{'correlationserver'}= clean_blank($1);
+		}
+		elsif ($parametro =~ m/^correlation_threshold\s+([0-9]*)/i) {
+			$pa_config->{'correlation_threshold'}= clean_blank($1);
+		}
 		elsif ($parametro =~ m/^icmpserver\s+([0-9]*)/i) {
 			$pa_config->{'icmpserver'}= clean_blank($1);
 		}
diff --git a/pandora_server/lib/PandoraFMS/Core.pm b/pandora_server/lib/PandoraFMS/Core.pm
index aec6dd169e..c57df509ff 100644
--- a/pandora_server/lib/PandoraFMS/Core.pm
+++ b/pandora_server/lib/PandoraFMS/Core.pm
@@ -281,7 +281,31 @@ our @EXPORT = qw(
 
 # Some global variables
 our @DayNames = qw(sunday monday tuesday wednesday thursday friday saturday);
-our @ServerTypes = qw (dataserver networkserver snmpconsole reconserver pluginserver predictionserver wmiserver exportserver inventoryserver webserver eventserver icmpserver snmpserver satelliteserver transactionalserver mfserver syncserver wuxserver syslogserver provisioningserver migrationserver);
+our @ServerTypes = qw (
+	dataserver
+	networkserver
+	snmpconsole
+	reconserver
+	pluginserver
+	predictionserver
+	wmiserver
+	exportserver
+	inventoryserver
+	webserver
+	eventserver
+	icmpserver
+	snmpserver
+	satelliteserver
+	transactionalserver
+	mfserver
+	syncserver
+	wuxserver
+	syslogserver
+	provisioningserver
+	migrationserver
+	alertserver
+	correlationserver
+);
 our @AlertStatus = ('Execute the alert', 'Do not execute the alert', 'Do not execute the alert, but increment its internal counter', 'Cease the alert', 'Recover the alert', 'Reset internal counter');
 
 # Event storm protection (no alerts or events)
@@ -639,7 +663,7 @@ sub pandora_evaluate_alert ($$$$$$$;$$$$) {
 			]
 		);
 
-		return $status unless (defined ($rc) && $rc == 1);
+		return $status unless !PandoraFMS::Tools::is_empty($rc) && $rc == 1;
 	}
 	
 	# Check min and max alert limits
@@ -709,7 +733,7 @@ sub pandora_process_alert ($$$$$$$$;$$) {
 
 		# Generate an event
 		if ($table eq 'tevent_alert') {
-			pandora_event ($pa_config, "Alert ceased (" .
+			pandora_event ($pa_config, "Correlated alert ceased (" .
 				safe_output($alert->{'name'}) . ")", 0, 0, $alert->{'priority'}, $id,
 				(defined ($alert->{'id_agent_module'}) ? $alert->{'id_agent_module'} : 0), 
 				"alert_ceased", 0, $dbh, 'monitoring_server', '', '', '', '', $critical_instructions, $warning_instructions, $unknown_instructions);
@@ -738,7 +762,7 @@ sub pandora_process_alert ($$$$$$$$;$$) {
 		if ($pa_config->{'alertserver'} == 1 && defined ($alert->{'id_template_module'})) {
 			pandora_queue_alert($pa_config, $dbh, $data, $alert, 0, $extra_macros);
 		} else {
-			pandora_execute_alert ($pa_config, $data, $agent, $module, $alert, 0, $dbh, $timestamp, 0, $extra_macros);
+			pandora_execute_alert ($pa_config, $data, $agent, $module, $alert, 0, $dbh, $timestamp, 0, $extra_macros, $is_correlated_alert);
 		}
 		return;
 	}
@@ -774,7 +798,7 @@ sub pandora_process_alert ($$$$$$$$;$$) {
 		# Update alert status
 		$alert->{'times_fired'} += 1;
 		$alert->{'internal_counter'} += 1;
-		
+
 		db_do($dbh, 'UPDATE ' . $table . ' SET times_fired = ?,
 				last_fired = ?, internal_counter = ? ' . $new_interval . ' WHERE id = ?',
 			$alert->{'times_fired'}, $utimestamp, $alert->{'internal_counter'}, $id);
@@ -983,7 +1007,7 @@ sub pandora_execute_alert ($$$$$$$$$;$$) {
 			$text = "Correlated alert $text";
 			pandora_event (
 				$pa_config,
-				"$text (" . safe_output($alert->{'name'}) . ") " . (defined ($module) ? 'assigned to ('. safe_output($module->{'nombre'}) . ")" : ""),
+				"$text (" . safe_output($alert->{'name'}) . ") ",
 				(defined ($agent) ? $agent->{'id_grupo'} : 0),
 				# id agent.
 				0,
diff --git a/pandora_server/lib/PandoraFMS/DB.pm b/pandora_server/lib/PandoraFMS/DB.pm
index b6e5264dfe..5f746b91eb 100644
--- a/pandora_server/lib/PandoraFMS/DB.pm
+++ b/pandora_server/lib/PandoraFMS/DB.pm
@@ -917,7 +917,7 @@ sub get_db_value_limit ($$$;@) {
 
 ##########################################################################
 ## Get a single row returned by an SQL query as a hash reference. Returns
-## -1 on error.
+## hash or undef on error.
 ##########################################################################
 sub get_db_single_row ($$;@) {
 	my ($dbh, $query, @values) = @_;
diff --git a/pandora_server/lib/PandoraFMS/Tools.pm b/pandora_server/lib/PandoraFMS/Tools.pm
index 59bcc0153d..e4d605ff12 100755
--- a/pandora_server/lib/PandoraFMS/Tools.pm
+++ b/pandora_server/lib/PandoraFMS/Tools.pm
@@ -67,6 +67,7 @@ our @EXPORT = qw(
 	INVENTORYSERVER
 	WEBSERVER
 	EVENTSERVER
+	CORRELATIONSERVER
 	ICMPSERVER
 	SNMPSERVER
 	SATELLITESERVER
@@ -192,6 +193,7 @@ use constant SYSLOGSERVER => 18;
 use constant PROVISIONINGSERVER => 19;
 use constant MIGRATIONSERVER => 20;
 use constant ALERTSERVER => 21;
+use constant CORRELATIONSERVER => 22;
 use constant NCMSERVER => 23;
 
 # Module status
@@ -780,12 +782,12 @@ sub md5check {
 sub logger ($$;$) {
 	my ($pa_config, $message, $level) = @_;
 
-	# Clean any string and ready to be printed in screen/file
-	$message = safe_output ($message);
-
 	$level = 1 unless defined ($level);
 	return if (!defined ($pa_config->{'verbosity'}) || $level > $pa_config->{'verbosity'});
 
+	# Clean any string and ready to be printed in screen/file
+	$message = safe_output ($message);
+
 	if (!defined($pa_config->{'log_file'})) {
 		print strftime ("%Y-%m-%d %H:%M:%S", localtime()) . " [V". $level ."] " . $message . "\n";
 		return;
@@ -2524,6 +2526,7 @@ sub get_server_name {
 	return "PROVISIONINGSERVER" if ($server_type eq PROVISIONINGSERVER);
 	return "MIGRATIONSERVER" if ($server_type eq MIGRATIONSERVER);
 	return "ALERTSERVER" if ($server_type eq ALERTSERVER);
+	return "CORRELATIONSERVER" if ($server_type eq CORRELATIONSERVER);
 
 	return "UNKNOWN";
 }