Error in Cache Refresh(Unable to refresh cache contents)

Hi All,
When i am refreshing Cache from the browser using link CPACache/refresh?mode=full it says success.
When i do from SXI_CACHE it gives an error.
   Error during last attempt to refresh cache
   Unable to refresh cache contents
So when i run any schenario in message monitoring i get the following error-
<i>SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">
  <SAP:Category>XIServer</SAP:Category>
  <SAP:Code area="XICACHE">UPDATE</SAP:Code>
  <SAP:P1 />
  <SAP:P2 />
  <SAP:P3 />
  <SAP:P4 />
  <SAP:AdditionalText>http response does not contain a valid XML root tag</SAP:AdditionalText>
  <SAP:ApplicationFaultMessage namespace="" />
  <SAP:Stack>An error occurred when refreshing the XI runtime cache</SAP:Stack>
  <SAP:Retry>N</SAP:Retry>
  </SAP:Error></i>
I checked the INTEGRATION_DIRECTORY_HMI connection...
here the response which im getting is..
<i> HEADER NAME                HEADER VALUE
response_line               HTTP/1.0 200
server_protocol             HTTP/1.0
status_code                 200
status_reason
ragma                       no-cache
ache-control                no-cache
ontent-type                 text/html
ontent-length               87
HTTP BODY
TITLE>Error</TITLE>#<BODY>#<H1>Error</H1>#FW-1 at nebula: Unknown WWW s
rver.</BODY>##
Time (ms)                                 17</i>
I believe that is not the right response.
Everything was working fine yesterday when all of a sudden this error cropped up from no where.
Regards,
Rahul

Hi,
This is the error it shows there..
<b>ERROR ID</b>      <i>UPDATE</i>
<i>http response does not contain a valid XML root tag</i>
Regards,
Rahul

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    We have a clustered environment with two nodes 2A and 2B. Server 2A crashed and therefore all members on 2B node were removed from the DCS view. Later the new core group view was installed but LiveCycle did resume operations as expected.
    Errors below:
    Exception caught while dealing with cache : Action - Get, ObjectType - UM_CLUSTER_INVALIDATION_CACHE, Exception message - Error accessing the cache container - Error on GET action for cache Replicated:UM_CLUSTER_INVALIDATION_CACHE
    ServiceRegist W   Cache get failed for service EncryptionService Reason: Error accessing the cache container - Error on GET action for cache
    Error accessing the cache container - Error on GET action for cache Local:SERVICE_FACTORY_CACHE
    The following message appeared for several different services:
    Cache put failed for service [CredentialService, ReaderExtensionsService,EncryptionService, etc]
    SSOSessionCle W   Error in cleaning stale sessions from the database. These sessions would be deleted in next trigger
                                     java.lang.RuntimeException: com.adobe.livecycle.cache.CacheActionException: Error accessing the cache container - Error on ENTRYSET action for cache Local:UM_ASSERTION_CACHE
      at com.adobe.idp.um.businesslogic.authentication.AssertionCacheManager.removeExpiredResults( AssertionCacheManager.java:125)
      at com.adobe.idp.um.scheduler.SSOSessionCleanupJob.execute(SSOSessionCleanupJob.java:69)
      at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
      at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529)
    Caused by: com.adobe.livecycle.cache.CacheActionException: Error accessing the cache container - Error on ENTRYSET action for cache Local:UM_ASSERTION_CACHE
      at com.adobe.livecycle.cache.adapter.GemfireLocalCacheAdapter.entrySet(GemfireLocalCacheAdap ter.java:219)
      at com.adobe.idp.um.businesslogic.authentication.AssertionCacheManager.removeExpiredResults( AssertionCacheManager.java:99)
      ... 3 more
    Caused by: com.gemstone.gemfire.distributed.DistributedSystemDisconnectedException: GemFire on 2B<v1>:9057/51073 started at Sun Aug 17 08:57:23 EDT 2014: Message distribution has terminated, caused by com.gemstone.gemfire.ForcedDisconnectException: This member has been forced out of the distributed system.  Reason='this member is no longer in the view but is initiating connections'
      at com.gemstone.gemfire.distributed.internal.DistributionManager$Stopper.generateCancelledEx ception(DistributionManager.java:746)
      at com.gemstone.gemfire.distributed.internal.InternalDistributedSystem$Stopper.generateCance lledException(InternalDistributedSystem.java:846)
      at com.gemstone.gemfire.internal.cache.GemFireCacheImpl$Stopper.generateCancelledException(G emFireCacheImpl.java:1090)
      at com.gemstone.gemfire.CancelCriterion.checkCancelInProgress(CancelCriterion.java:59)
      at com.gemstone.gemfire.internal.cache.LocalRegion.checkRegionDestroyed(LocalRegion.java:669 4)
      at com.gemstone.gemfire.internal.cache.LocalRegion.checkReadiness(LocalRegion.java:2587)
      at com.gemstone.gemfire.internal.cache.LocalRegion.entries(LocalRegion.java:1815)
      at com.gemstone.gemfire.internal.cache.LocalRegion.entrySet(LocalRegion.java:7941)
      at com.adobe.livecycle.cache.adapter.GemfireLocalCacheAdapter.entrySet(GemfireLocalCacheAdap ter.java:209)
      ... 4 more
    Caused by: com.gemstone.gemfire.ForcedDisconnectException: This member has been forced out of the distributed system.  Reason='this member is no longer in the view but is initiating connections'
      at com.gemstone.org.jgroups.protocols.pbcast.ParticipantGmsImpl.handleLeaveResponse(Particip antGmsImpl.java:106)
      at com.gemstone.org.jgroups.protocols.pbcast.GMS.up(GMS.java:1289)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.VIEW_SYNC.up(VIEW_SYNC.java:202)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:276)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.UNICAST.up(UNICAST.java:294)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:625)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:187)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:504)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.FD.up(FD.java:438)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.Discovery.up(Discovery.java:258)
      at com.gemstone.org.jgroups.stack.Protocol.passUp(Protocol.java:767)
      at com.gemstone.org.jgroups.protocols.TP.handleIncomingMessage(TP.java:1110)
      at com.gemstone.org.jgroups.protocols.TP.handleIncomingPacket(TP.java:1016)
      at com.gemstone.org.jgroups.protocols.TP.receive(TP.java:923)
      at com.gemstone.org.jgroups.protocols.UDP$UcastReceiver.run(UDP.java:1320)
      at java.lang.Thread.run(Thread.java:773)
    [22/08/14 0:28:10:237 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:29:10:252 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:30:10:268 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:31:10:283 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:32:10:298 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:33:10:313 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:34:10:328 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:35:10:343 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:36:10:358 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:37:10:373 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerException
    [22/08/14 0:38:10:389 EDT] 00000b4f WorkPolicyEva W   Exception thrown in background thread. Cause: java.lang.NullPointerExceptionor
    I have tried looking for the root cause about why LiveCycle was not able to resume normally, didn't find anything related.

    LiveCycle uses Gemfire as distributed cache for cluster members. If you are using TCP Locators (caching based on TCP instead of UDP), below are the possible situations which might lead to “ForcedDisconnectException” :
    - There is time difference between two nodes.
    - These is network connectivity issues.
    - The high CPU usage by the member crashed.
    -Wasil

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