diff --git a/clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/ServiceCenterDiscovery.java b/clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/ServiceCenterDiscovery.java
index 6406325..ccc8fb1 100644
--- a/clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/ServiceCenterDiscovery.java
+++ b/clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/ServiceCenterDiscovery.java
@@ -17,6 +17,7 @@
 
 package org.apache.servicecomb.service.center.client;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -186,7 +187,11 @@
       }
     } catch (Exception e) {
       LOGGER.error("find service {}#{} instance failed.", k.appId, k.serviceName, e);
-      failedKeys.add(k);
+      if (!(e.getCause() instanceof IOException)) {
+        // for IOException, do not remove cache, or when service center
+        // not available, invocation between microservices will fail.
+        failedKeys.add(k);
+      }
     }
     return failedKeys;
   }