I continue to get this error when I run loadgen.

This is a 3 server DAG (CAS/MBX roles on all 3 of them)

Using LoadGen to build some loads. Started with few mailboxes. Even with 10 of them it fails.

Error message is as follows:

Engine.General Warning: 0 : 02/03/2015 03:30:13 -- Caught a non-fatal exception in executeTaskStub. The exception was handled by the task module: Microsoft.Mapi.MapiExceptionNetworkError: MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80004005, ec=2423)
Diagnostic context:
    Lid: 49064   dwParam: 0x3
    Lid: 59431   EMSMDB.EcDoConnectEx called [length=151]
    Lid: 51239   EMSMDB.EcDoConnectEx exception [rpc_status=0x6BA][latency=21000]
    Lid: 62184  
    Lid: 16280   dwParam: 0x0 Msg: EEInfo: ComputerName: n/a
    Lid: 8600    dwParam: 0x0 Msg: EEInfo: ProcessID: 11076
    Lid: 12696   dwParam: 0x0 Msg: EEInfo: Generation Time: 0415-02-03T11:30:13.0470000Z
    Lid: 10648   dwParam: 0x0 Msg: EEInfo: Generating component: 13
    Lid: 14744   dwParam: 0x0 Msg: EEInfo: Status: 1722
    Lid: 9624    dwParam: 0x0 Msg: EEInfo: Detection location: 1352
    Lid: 13720   dwParam: 0x0 Msg: EEInfo: Flags: 0
    Lid: 11672   dwParam: 0x0 Msg: EEInfo: NumberOfParameters: 1
    Lid: 12952   dwParam: 0x0 Msg: EEInfo: prm[0]: Long val: 3221360650
    Lid: 62184  
    Lid: 16280   dwParam: 0x0 Msg: EEInfo: ComputerName: n/a
    Lid: 8600    dwParam: 0x0 Msg: EEInfo: ProcessID: 11076
    Lid: 12696   dwParam: 0x0 Msg: EEInfo: Generation Time: 0415-02-03T11:30:13.0470000Z
    Lid: 10648   dwParam: 0x0 Msg: EEInfo: Generating component: 14
    Lid: 14744   dwParam: 0x0 Msg: EEInfo: Status: -1073606646
    Lid: 9624    dwParam: 0x0 Msg: EEInfo: Detection location: 1380
    Lid: 13720   dwParam: 0x0 Msg: EEInfo: Flags: 0
    Lid: 11672   dwParam: 0x0 Msg: EEInfo: NumberOfParameters: 2
    Lid: 12952   dwParam: 0x0 Msg: EEInfo: prm[0]: Long val: 12002
    Lid: 8856    dwParam: 0x0 Msg: EEInfo: prm[1]: Unicode  string: /rpc/rpcproxy.dll?e04d12a1-1ad8-4ade-bf08-c828e1c20e96@MCBP.NET:6001
    Lid: 59505   StoreEc: 0x977     
    Lid: 50544   ClientVersion: 15.0.805.0
    Lid: 52080   StoreEc: 0x977     
    Lid: 51152  
    Lid: 52465   StoreEc: 0x977     
    Lid: 60065  
    Lid: 33777   StoreEc: 0x977     
    Lid: 59805  
    Lid: 52487   StoreEc: 0x977     
    Lid: 19778  
    Lid: 27970   StoreEc: 0x977     
    Lid: 17730  
    Lid: 25922   StoreEc: 0x977     
   at Microsoft.Mapi.MapiExceptionHelper.InternalThrowIfErrorOrWarning(String message, Int32 hresult, Boolean allowWarnings, Int32 ec, DiagnosticContext diagCtx, Exception innerException)
   at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, IExInterface iUnknown, Exception innerException)
   at Microsoft.Mapi.ExRpcConnectionFactory.Create(ExRpcConnectionInfo connectionInfo)
   at Microsoft.Mapi.MapiStore.OpenMapiStore(String serverDn, String userDn, String mailboxDn, Guid guidMailbox, Guid guidMdb, String userName, String domainName, String password, String httpProxyServerName, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, Boolean wantRedirect, String& correctServerDN, ClientIdentityInfo clientIdentity, String applicationId, Client xropClient, Boolean wantWebServices, Byte[] clientSessionInfo, TimeSpan connectionTimeout, TimeSpan callTimeout, Byte[] tenantHint)
   at Microsoft.Mapi.MapiStore.OpenMailbox(String serverDn, String userDn, String mailboxDn, String userName, String domainName, String password, String httpProxyServerName, ConnectFlag connectFlags, OpenStoreFlag storeFlags, CultureInfo cultureInfo, WindowsIdentity windowsIdentity, String applicationId)
   at Microsoft.Exchange.Swordfish.Extensions.MapiCommon.MapiStoreUtil.<>c__DisplayClass2.<OpenMailbox>b__0()
   at Microsoft.Exchange.Swordfish.IL.ILUtil.DoTryFilterCatch(ThreadStart tryClause, Predicate`1 filterClause, Action`1 catchClause)
   at Microsoft.Exchange.Swordfish.Extensions.MapiCommon.MapiStoreUtil.OpenMailbox(User user, ConnectFlag connectFlags, OpenStoreFlag openStoreFlags)
   at Microsoft.Exchange.Swordfish.Extensions.StoreBuilder.Builder.EnsureMailboxStore(User user)
   at Microsoft.Exchange.Swordfish.Extensions.StoreBuilder.Builder.BuildInboxRules(User user)
   at Microsoft.Exchange.Swordfish.Extensions.StoreBuilder.Builder.BuildMailboxStore(User user)

Any suggestions?

Note:

I am able to send an receive emails through OWA and Outlook client fine.

• Edited by kayvwar 11 minutes ago