# Repairing distributed cache with PowerShell

- Link: https://sharepointtechnicalsupport.com/2015/04/29/distributed-cache-repairing-powershell/
- Published: 2015-04-29T08:27:25+05:30
- Author: Deviprasad Panda

* Recently we had issues with our distributed cache system that was set up on are
   farm quite some time ago when I built it with SPAuto-Installer.  This could have
   been from rolling out cumulative updates or what have you.  There is very little
   documentation on the web for this.

*  In our case we had 4 servers (2 web front-ends and 2 application servers)  all
with the distributed cache enabled.  Only one server was running the distributed
cache.

*  The correct topology for distributed cache is for it to exist on the web front-
ends.  So we made some changes to the farm.

Clean up all 4 Servers using the following commands:

#Stopping the service on local host

Stop-SPDistributedCacheServiceInstance -Graceful

#Removing the service from SharePoint on local host.

Remove-SPDistributedCacheServiceInstance

#Cleanup left over pieces from SharePoint

$instanceName =”SPDistributedCacheService Name=AppFabricCachingService”

$serviceInstance = Get-SPServiceInstance | ? {($_.service.tostring()) -eq $instanceName-
and ($_.server.name) -eq $env:computername}

$serviceInstance.delete()

Then we added the cache host back to WEB01:

#Re-add the server back to the cluster

Add-SPDistributedCacheServiceInstance

We then checked the SPDistributedCacheClientSettings and found that “MaxConnectionsToServer”
was set to 16 for all containers.

$DLTC = Get-SPDistributedCacheClientSetting -ContainerType DistributedLogonTokenCache

$DLTC

We used the following script to change  “MaxConnectionsToServer” back to 1 and increase
the timeout for each container.

Add-PSSnapin Microsoft.Sharepoint.Powershell

#DistributedLogonTokenCache

$DLTC = Get-SPDistributedCacheClientSetting -ContainerType DistributedLogonTokenCache

$DLTC.MaxConnectionsToServer = 1

$DLTC.requestTimeout = “3000”

$DLTC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedLogonTokenCache -DistributedCacheClientSettings
$DLTC

#DistributedViewStateCache

$DVSC = Get-SPDistributedCacheClientSetting -ContainerType DistributedViewStateCache

$DVSC.MaxConnectionsToServer = 1

$DVSC.requestTimeout = “3000”

$DLTC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedViewStateCache $DVSC

#DistributedAccessCache

$DAC = Get-SPDistributedCacheClientSetting -ContainerType DistributedAccessCache

$DAC.MaxConnectionsToServer = 1

$DAC.requestTimeout = “3000”

$DAC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedAccessCache $DAC

#DistributedAccessCache

$DAF = Get-SPDistributedCacheClientSetting -ContainerType DistributedAccessCache

$DAF.MaxConnectionsToServer = 1

$DAF.requestTimeout = “3000”

$DAF.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedActivityFeedCache 
$DAF

#DistributedActivityFeedLMTCache

$DAFC = Get-SPDistributedCacheClientSetting -ContainerType DistributedActivityFeedLMTCache

$DAFC.MaxConnectionsToServer = 1

$DAFC.requestTimeout = “3000”

$DAFC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedActivityFeedLMTCache
$DAFC

#DistributedBouncerCache

$DBC = Get-SPDistributedCacheClientSetting -ContainerType DistributedBouncerCache

$DBC.MaxConnectionsToServer = 1

$DBC.requestTimeout = “3000”

$DBC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedBouncerCache $DBC

#DistributedDefaultCache

$DDC = Get-SPDistributedCacheClientSetting -ContainerType DistributedDefaultCache

$DDC.MaxConnectionsToServer = 1

$DDC.requestTimeout = “3000”

$DDC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedDefaultCache $DDC

#DistributedSearchCache

$DSC = Get-SPDistributedCacheClientSetting -ContainerType DistributedSearchCache

$DSC.MaxConnectionsToServer = 1

$DSC.requestTimeout = “3000”

$DSC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedSearchCache $DSC

#DistributedSecurityTrimmingCache

$DTC = Get-SPDistributedCacheClientSetting -ContainerType DistributedSecurityTrimmingCache

$DTC.MaxConnectionsToServer = 1

$DTC.requestTimeout = “3000”

$DTC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedSecurityTrimmingCache
$DTC

#DistributedServerToAppServerAccessTokenCache

$DSTAC = Get-SPDistributedCacheClientSetting -ContainerType DistributedServerToAppServerAccessTokenCache

$DSTAC.MaxConnectionsToServer = 1

$DSTAC.requestTimeout = “3000”

$DSTAC.channelOpenTimeOut = “3000”

Set-SPDistributedCacheClientSetting -ContainerType DistributedServerToAppServerAccessTokenCache
$DSTAC

 * We then stopped and restarted Distributed Cache from Central Admin on WEB01
 * We then attempted to start “Distributed Cache” on WEB02 and received error “failed
   to connect to hosts in the cluster”
 * Performing a TRACERT from WEB01 to WEB02, we can see a device is in the middle(
   10.21.1.5).
 * Installed Telnet

Import-Module servermanager

Add-WindowsFeature telnet-client

 * Telnet from WEB01 to WEB02 on port 22233 and the connection was established.

  We then stopped, cleaned and added WEB02 back to the cache farm
  #Stopping the service on local host
  Stop-SPDistributedCacheServiceInstance -Graceful
  #Removing the service from SharePoint on local host.
  Remove-SPDistributedCacheServiceInstance
  #Cleanup left over pieces from SharePoint
  $instanceName =”SPDistributedCacheService Name=AppFabricCachingService”
  $serviceInstance = Get-SPServiceInstance | ? {($_.service.tostring()) -eq $instanceName-
  and ($_.server.name) -eq $env:computername}
  $serviceInstance.delete()
  Then we added the cache host back to WEB02:
  #Re-add the server back to the cluster
  Add-SPDistributedCacheServiceInstance
  This time it started!
   * Now we have WEB01 and WEB02 servicing distributed Cache
  We checked the ULS Logs with ULSViewer and found all successful events for Distributed
  Cache.
  Status
  =======
  Distributed cache is now healthy and in a working state on both WFE Servers.
  
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