diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/datalayer/batis/ClientEventLastPingMapper.java b/src/main/java/ch/ethz/seb/sebserver/webservice/datalayer/batis/ClientEventLastPingMapper.java
index ff1615c0..cf233e83 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/datalayer/batis/ClientEventLastPingMapper.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/datalayer/batis/ClientEventLastPingMapper.java
@@ -33,7 +33,7 @@ public interface ClientEventLastPingMapper {
     @SelectProvider(type = SqlProviderAdapter.class, method = "select")
     @ResultType(ClientEventLastPingRecord.class)
     @ConstructorArgs({
-            @Arg(column = "client_connection_id", javaType = Long.class, jdbcType = JdbcType.BIGINT),
+            @Arg(column = "id", javaType = Long.class, jdbcType = JdbcType.BIGINT),
             @Arg(column = "server_time", javaType = Long.class, jdbcType = JdbcType.BIGINT),
     })
     Collection<ClientEventLastPingRecord> selectMany(SelectStatementProvider select);
@@ -42,7 +42,7 @@ public interface ClientEventLastPingMapper {
         return SelectDSL.selectWithMapper(
                 this::selectMany,
 
-                ClientEventRecordDynamicSqlSupport.clientConnectionId.as("client_connection_id"),
+                ClientEventRecordDynamicSqlSupport.clientConnectionId.as("id"),
                 ClientEventRecordDynamicSqlSupport.serverTime.as("server_time"))
 
                 .from(ClientEventRecordDynamicSqlSupport.clientEventRecord);
@@ -50,14 +50,14 @@ public interface ClientEventLastPingMapper {
 
     final class ClientEventLastPingRecord {
 
-        public final Long connectionId;
+        public final Long id;
         public final Long lastPingTime;
 
         public ClientEventLastPingRecord(
-                final Long client_connection_id,
+                final Long id,
                 final Long server_time) {
 
-            this.connectionId = client_connection_id;
+            this.id = id;
             this.lastPingTime = server_time;
         }
     }
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/ClientEventDAOImpl.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/ClientEventDAOImpl.java
index 7d3b069d..1d07897b 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/ClientEventDAOImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/ClientEventDAOImpl.java
@@ -14,7 +14,6 @@ import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
-import java.util.Objects;
 import java.util.Set;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
@@ -296,20 +295,38 @@ public class ClientEventDAOImpl implements ClientEventDAO {
     @Transactional
     public Result<Collection<EntityKey>> delete(final Set<EntityKey> all) {
         return Result.tryCatch(() -> {
-            return all
+
+            final List<Long> pks = all
                     .stream()
                     .map(EntityKey::getModelId)
                     .map(Long::parseLong)
-                    .map(pk -> {
-                        final int deleted = this.clientEventRecordMapper.deleteByPrimaryKey(pk);
-                        if (deleted == 1) {
-                            return new EntityKey(String.valueOf(pk), EntityType.CLIENT_EVENT);
-                        } else {
-                            return null;
-                        }
-                    })
-                    .filter(Objects::nonNull)
                     .collect(Collectors.toList());
+
+            this.clientEventRecordMapper
+                    .deleteByExample()
+                    .where(ClientEventRecordDynamicSqlSupport.id, isIn(pks))
+                    .build()
+                    .execute();
+
+            return pks
+                    .stream()
+                    .map(pk -> new EntityKey(String.valueOf(pk), EntityType.CLIENT_EVENT))
+                    .collect(Collectors.toList());
+
+//            return all
+//                    .stream()
+//                    .map(EntityKey::getModelId)
+//                    .map(Long::parseLong)
+//                    .map(pk -> {
+//                        final int deleted = this.clientEventRecordMapper.deleteByPrimaryKey(pk);
+//                        if (deleted == 1) {
+//                            return new EntityKey(String.valueOf(pk), EntityType.CLIENT_EVENT);
+//                        } else {
+//                            return null;
+//                        }
+//                    })
+//                    .filter(Objects::nonNull)
+//                    .collect(Collectors.toList());
         });
     }
 
@@ -368,7 +385,7 @@ public class ClientEventDAOImpl implements ClientEventDAO {
     public Result<Long> getLastPing(final Long pk) {
         return Result.tryCatch(() -> this.clientEventRecordMapper
                 .selectByPrimaryKey(pk)
-                .getClientTime());
+                .getServerTime());
     }
 
     private Result<ClientEventRecord> recordById(final Long id) {
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/ClientConnectionDataInternal.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/ClientConnectionDataInternal.java
index 4506f0bc..894e99cd 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/ClientConnectionDataInternal.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/ClientConnectionDataInternal.java
@@ -75,7 +75,7 @@ public class ClientConnectionDataInternal extends ClientConnectionData {
     @Override
     @JsonProperty(ATTR_MISSING_PING)
     public Boolean getMissingPing() {
-        return this.pingIndicator.isMissingPing();
+        return this.pingIndicator != null && this.pingIndicator.isMissingPing();
     }
 
     @Override
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientConnectionServiceImpl.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientConnectionServiceImpl.java
index d7b018cc..c996e4a0 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientConnectionServiceImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientConnectionServiceImpl.java
@@ -512,6 +512,7 @@ public class SEBClientConnectionServiceImpl implements SEBClientConnectionServic
 
             final Cache cache = this.cacheManager.getCache(ExamSessionCacheService.CACHE_NAME_ACTIVE_CLIENT_CONNECTION);
             final long now = Utils.getMillisecondsNow();
+            final Consumer<ClientConnectionDataInternal> missingPingUpdate = missingPingUpdate(now);
             this.examSessionService
                     .getExamDAO()
                     .allRunningExamIds()
@@ -529,8 +530,8 @@ public class SEBClientConnectionServiceImpl implements SEBClientConnectionServic
                     .map(token -> cache.get(token, ClientConnectionDataInternal.class))
                     .filter(Objects::nonNull)
                     .filter(connection -> connection.pingIndicator != null &&
-                            connection.clientConnection.status.establishedStatus)
-                    .forEach(missingPingUpdate(now));
+                            connection.clientConnection.status.clientActiveStatus)
+                    .forEach(connection -> missingPingUpdate.accept(connection));
 
         } catch (final Exception e) {
             log.error("Failed to update ping events: ", e);
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractClientIndicator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractClientIndicator.java
index bf01df3e..db1d2301 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractClientIndicator.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractClientIndicator.java
@@ -8,9 +8,10 @@
 
 package ch.ethz.seb.sebserver.webservice.servicelayer.session.impl.indicator;
 
+import org.joda.time.DateTimeUtils;
+
 import ch.ethz.seb.sebserver.gbl.Constants;
 import ch.ethz.seb.sebserver.gbl.model.exam.Indicator;
-import ch.ethz.seb.sebserver.gbl.util.Utils;
 import ch.ethz.seb.sebserver.webservice.servicelayer.session.ClientIndicator;
 
 public abstract class AbstractClientIndicator implements ClientIndicator {
@@ -63,15 +64,14 @@ public abstract class AbstractClientIndicator implements ClientIndicator {
 
     @Override
     public double getValue() {
+        final long now = DateTimeUtils.currentTimeMillis();
         if (!this.valueInitializes) {
-            final long now = Utils.getMillisecondsNow();
             this.currentValue = computeValueAt(now);
             this.lastPersistentUpdate = now;
             this.valueInitializes = true;
         }
 
         if (!this.cachingEnabled && this.active) {
-            final long now = System.currentTimeMillis();
             if (now - this.lastPersistentUpdate > PERSISTENT_UPDATE_INTERVAL) {
                 this.currentValue = computeValueAt(now);
                 this.lastPersistentUpdate = now;
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractPingIndicator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractPingIndicator.java
index d0419be5..18a5bff0 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractPingIndicator.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/AbstractPingIndicator.java
@@ -13,6 +13,7 @@ import java.util.EnumSet;
 import java.util.Set;
 
 import org.joda.time.DateTime;
+import org.joda.time.DateTimeUtils;
 import org.joda.time.DateTimeZone;
 
 import ch.ethz.seb.sebserver.gbl.Constants;
@@ -61,7 +62,7 @@ public abstract class AbstractPingIndicator extends AbstractClientIndicator {
         if (!this.cachingEnabled && this.pingRecord != null) {
 
             // Update last ping time on persistent storage
-            final long millisecondsNow = System.currentTimeMillis();
+            final long millisecondsNow = DateTimeUtils.currentTimeMillis();
             if (millisecondsNow - this.lastUpdate > INTERVAL_FOR_PERSISTENT_UPDATE) {
                 this.pingRecord.setClientTime(timestamp);
                 this.pingRecord.setServerTime(millisecondsNow);
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/PingIntervalClientIndicator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/PingIntervalClientIndicator.java
index 2ce20a79..c4954a74 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/PingIntervalClientIndicator.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/indicator/PingIntervalClientIndicator.java
@@ -11,8 +11,7 @@ package ch.ethz.seb.sebserver.webservice.servicelayer.session.impl.indicator;
 import java.math.BigDecimal;
 import java.util.Comparator;
 
-import org.joda.time.DateTime;
-import org.joda.time.DateTimeZone;
+import org.joda.time.DateTimeUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
@@ -28,7 +27,6 @@ import ch.ethz.seb.sebserver.gbl.model.exam.Indicator.IndicatorType;
 import ch.ethz.seb.sebserver.gbl.model.session.ClientEvent;
 import ch.ethz.seb.sebserver.gbl.model.session.ClientEvent.EventType;
 import ch.ethz.seb.sebserver.gbl.util.Result;
-import ch.ethz.seb.sebserver.gbl.util.Utils;
 import ch.ethz.seb.sebserver.webservice.datalayer.batis.model.ClientEventRecord;
 import ch.ethz.seb.sebserver.webservice.servicelayer.dao.ClientEventDAO;
 
@@ -51,7 +49,6 @@ public final class PingIntervalClientIndicator extends AbstractPingIndicator {
     public PingIntervalClientIndicator(final ClientEventDAO clientEventDAO) {
         super(clientEventDAO);
         this.cachingEnabled = true;
-        this.currentValue = computeValueAt(Utils.getMillisecondsNow());
     }
 
     @Override
@@ -63,6 +60,8 @@ public final class PingIntervalClientIndicator extends AbstractPingIndicator {
 
         super.init(indicatorDefinition, connectionId, active, cachingEnabled);
 
+        this.currentValue = computeValueAt(DateTimeUtils.currentTimeMillis());
+
         try {
             indicatorDefinition
                     .getThresholds()
@@ -77,7 +76,8 @@ public final class PingIntervalClientIndicator extends AbstractPingIndicator {
 
         if (!cachingEnabled) {
             try {
-                this.missingPing = this.pingErrorThreshold < getValue();
+                final double value = getValue();
+                this.missingPing = this.pingErrorThreshold < value;
             } catch (final Exception e) {
                 log.error("Failed to initialize missingPing: {}", e.getMessage());
                 this.missingPing = false;
@@ -108,7 +108,7 @@ public final class PingIntervalClientIndicator extends AbstractPingIndicator {
 
     @Override
     public double getValue() {
-        final long now = DateTime.now(DateTimeZone.UTC).getMillis();
+        final long now = DateTimeUtils.currentTimeMillis();
         return now - super.getValue();
     }
 
@@ -134,6 +134,9 @@ public final class PingIntervalClientIndicator extends AbstractPingIndicator {
                         .getLastPing(super.pingRecord.getId());
 
                 if (!lastPing.hasError()) {
+                    if (Double.isNaN(this.currentValue)) {
+                        return lastPing.get().doubleValue();
+                    }
                     return Math.max(this.currentValue, lastPing.get().doubleValue());
                 } else {
                     log.error("Failed to get last ping from persistent: {}", lastPing.getError().getMessage());
diff --git a/src/main/resources/messages.properties b/src/main/resources/messages.properties
index 71f7206d..99e790a8 100644
--- a/src/main/resources/messages.properties
+++ b/src/main/resources/messages.properties
@@ -596,7 +596,7 @@ sebserver.exam.indicator.type.WLAN_STATUS=WiFi Status
 sebserver.exam.indicator.type.description.LAST_PING=This indicator shows the time in milliseconds since<br/> the last ping has been received from a SEB Client.<br/>This indicator can be used to track a SEB Client connection and indicate connection loss.<br/><br/>The value is in milliseconds.
 sebserver.exam.indicator.type.description.ERROR_COUNT=This indicator shows the number of error log messages that<br/> has been received from a SEB Client.<br/>This indicator can be used to track errors of connected SEB Clients<br/><br/>The value is a natural number.
 sebserver.exam.indicator.type.description.WARN_COUNT=This indicator shows the number of warn log messages that<br/> has been received from a SEB Client.<br/>This indicator can be used to track warnings of connected SEB Clients<br/><br/>The value is a natural number.
-sebserver.exam.indicator.type.description.INFO_COUNT=This indicator shows the number of warn log messages that<br/> has been received from a SEB Client.<br/>This indicator can be used to track warnings of connected SEB Clients<br/><br/>The value is a natural number.
+sebserver.exam.indicator.type.description.INFO_COUNT=This indicator shows the number of info log messages that<br/> has been received from a SEB Client.<br/>This indicator can be used to track warnings of connected SEB Clients<br/><br/>The value is a natural number.
 sebserver.exam.indicator.type.description.BATTERY_STATUS=This indicator shows the percentage of the battery load level of a SEB Client.
 sebserver.exam.indicator.type.description.WLAN_STATUS=This indicator shows the percentage of the WiFi connection status of a SEB Client.