Problem with CRM 2011 web front end cluster

Hi.
We have a CRM 2011 (RU17) environment with a SQL DB server and 2 web front end CRM server in a cluster.
Since few days (about 10) it seems that one of the 2 nodes is not working, and since yesterday many users report access problems when calling the application by cluster name - as usual since we deployed CRM 1 year ago.
I tried myself, and I can run the application by cluster name without problems. If it try the separate notes addresses, one of them works, the other doesn't.
I checked the 2 web front end servers, and are (or seem) both properly configured, with all patches installed.
Following the information I got from Event viewer. Any suggestion welcomed!
Many thanks and Best regards
On the 'faulty' server I have different errors at event viewer level:
Faulting application name: Microsoft.Crm.Sandbox.HostService.exe, version: 5.0.9690.4150, time stamp: 0x53559982
Faulting module name: KERNELBASE.dll, version: 6.1.7601.18229, time stamp: 0x51fb1677
Exception code: 0xe0434352
Fault offset: 0x000000000000940d
Faulting process id: 0x6f8
Faulting application start time: 0x01cf8f93aa9a7ff8
Faulting application path: C:\PROGRA~1\MICROS~4\Server\bin\Microsoft.Crm.Sandbox.HostService.exe
Faulting module path: C:\Windows\system32\KERNELBASE.dll
Report Id: f5019a68-fb86-11e3-9f21-005056853970
Application: Microsoft.Crm.Sandbox.HostService.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Runtime.InteropServices.COMException
Stack:
   at Microsoft.Crm.Sandbox.HostService.InitializeThreadProc(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
The Sandbox Host service has encountered an unexpected error and has stopped.
Source: Microsoft.Crm.Sandbox.HostService.exe (1784)
Error: System.Runtime.InteropServices.COMException (0x8007203A): The server is not operational.
   at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
   at System.DirectoryServices.DirectoryEntry.Bind()
   at System.DirectoryServices.DirectoryEntry.get_AdsObject()
   at System.DirectoryServices.PropertyValueCollection.PopulateList()
   at System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName)
   at System.DirectoryServices.PropertyCollection.get_Item(String propertyName)
   at Microsoft.Crm.SecurityUtils.GetSidFromAD(Guid objectGuid)
   at Microsoft.Crm.Sandbox.SandboxHost.SetPrivilegeUserGroupId(Guid privilegeUserGroupId)
   at Microsoft.Crm.Sandbox.HostService.InitializeThreadProc(Object stateInfo)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
On the 'running' server event viewer I only have one error, related to mail router:
#23379 - Could not verify the version of Microsoft Dynamics CRM at http://alkcg106.d30.intra:5555/AkzoNobelIndustrialCoatings. There was no endpoint listening at http://alkcg106:5555/AkzoNobelIndustrialCoatings/XRMServices/2011/Organization.svc that could
accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.

Apologize for not having indicated here the resolotion I got thanks to MS support...
We enabled the trace and we got
a http error page stating maxQueryStringLength was insufficient. We changed the maxQueryStringLength and QueryString values in the CRM web.config value to 10240.
We also noticed an error related to the DC being unavailable. We checked in the CRM registry hive and see in the non-working server you had a PreferredDc key pointing to “AMDNAD”. On pinging
AMDNAD we see it is not reachable. We removed the PreferredDc key and after iisreset we can navigate to crm.

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