diff --git a/core/src/main/java/org/apache/accumulo/core/conf/Property.java b/core/src/main/java/org/apache/accumulo/core/conf/Property.java
index 160d9bca060..c5bcdf4d452 100644
--- a/core/src/main/java/org/apache/accumulo/core/conf/Property.java
+++ b/core/src/main/java/org/apache/accumulo/core/conf/Property.java
@@ -1478,8 +1478,7 @@ public static boolean isValidTablePropertyKey(String key) {
       COMPACTOR_MINTHREADS_TIMEOUT,
 
       // others
-      TSERV_NATIVEMAP_ENABLED, TSERV_SCAN_MAX_OPENFILES, MANAGER_RECOVERY_WAL_EXISTENCE_CACHE_TIME,
-      TSERV_SESSION_MAXIDLE, TSERV_UPDATE_SESSION_MAXIDLE);
+      TSERV_NATIVEMAP_ENABLED, TSERV_SCAN_MAX_OPENFILES, MANAGER_RECOVERY_WAL_EXISTENCE_CACHE_TIME);
 
   /**
    * Checks if the given property may be changed via Zookeeper, but not recognized until the restart
diff --git a/server/tserver/src/main/java/org/apache/accumulo/tserver/session/SessionManager.java b/server/tserver/src/main/java/org/apache/accumulo/tserver/session/SessionManager.java
index 7921926149d..43a6792fd1f 100644
--- a/server/tserver/src/main/java/org/apache/accumulo/tserver/session/SessionManager.java
+++ b/server/tserver/src/main/java/org/apache/accumulo/tserver/session/SessionManager.java
@@ -63,20 +63,14 @@ public class SessionManager {
   private static final Logger log = LoggerFactory.getLogger(SessionManager.class);
 
   private final ConcurrentMap<Long,Session> sessions = new ConcurrentHashMap<>();
-  private final long maxIdle;
-  private final long maxUpdateIdle;
   private final BlockingQueue<Session> deferredCleanupQueue = new ArrayBlockingQueue<>(5000);
   private final ServerContext ctx;
   private volatile LongConsumer zombieCountConsumer = null;
 
   public SessionManager(ServerContext context) {
     this.ctx = context;
-    final AccumuloConfiguration aconf = context.getConfiguration();
-    maxUpdateIdle = aconf.getTimeInMillis(Property.TSERV_UPDATE_SESSION_MAXIDLE);
-    maxIdle = aconf.getTimeInMillis(Property.TSERV_SESSION_MAXIDLE);
-
-    Runnable r = () -> sweep(maxIdle, maxUpdateIdle);
-
+    long maxIdle = ctx.getConfiguration().getTimeInMillis(Property.TSERV_SESSION_MAXIDLE);
+    Runnable r = () -> sweep(ctx);
     ThreadPools.watchCriticalScheduledTask(context.getScheduledExecutor().scheduleWithFixedDelay(r,
         0, Math.max(maxIdle / 2, 1000), MILLISECONDS));
   }
@@ -98,7 +92,7 @@ public long createSession(Session session, boolean reserve) {
   }
 
   public long getMaxIdleTime() {
-    return maxIdle;
+    return ctx.getConfiguration().getTimeInMillis(Property.TSERV_SESSION_MAXIDLE);
   }
 
   /**
@@ -294,7 +288,10 @@ private void cleanup(Session session) {
     cleanup(deferredCleanupQueue, session);
   }
 
-  private void sweep(final long maxIdle, final long maxUpdateIdle) {
+  private void sweep(final ServerContext context) {
+    final AccumuloConfiguration conf = context.getConfiguration();
+    final long maxUpdateIdle = conf.getTimeInMillis(Property.TSERV_UPDATE_SESSION_MAXIDLE);
+    final long maxIdle = conf.getTimeInMillis(Property.TSERV_SESSION_MAXIDLE);
     List<Session> sessionsToCleanup = new LinkedList<>();
     Iterator<Session> iter = sessions.values().iterator();
     while (iter.hasNext()) {