SSRS 2008 R2, Farm - Load Balanced and HTTP status 401: Unauthorized

Question!

I have SQL Server Reporting services 2008 R2 environment in my Company.

2 servers Windows 2008 R2: PRERPSW01 and PRERPSW02, in domain DOMAIN_Company NLB name: PRERPS

IPs address ( I get by ping command):

PRERPSW01   192.168.110.41
prerps      192.168.90.92

hosts file in PRERPSW01 server

192.168.110.41  prerps

In PRERPSW01 and PRERPSW02 servers, there is this configuration:

Config Report Server: C:\Program Files\Microsoft SQL Server\MSRS10_50.REPORTING\Reporting Services\ReportServer\rsreportserver.config
HostName: PRERPS. 
UrlRoot: http://PRERPS/ReportServer

In PRERPSW01, I use credentials PRERPSW01\installerUser

Open IE with http://PRERPS/ReportServer/ReportService2005.asmx and I cannot access

Open IE with http://PRERPSW01/ReportServer/ReportService2005.asmx and I can access

I have Poweshell script to deploy RDL files using URI http://PRERPS/ReportServer/ReportService2005.asmx

But I get the error

The request failed with HTTP status 401: Unauthorized.

In my PC, with credentials DOMAIN_Company\My_user,

Open IE with http://PRECASRPS/ReportServer/ReportService2005.asmx and I CAN access

Any suggestions?

Updated

Now, I use credentials DOMAIN_Company\PreRPSAdministrator. The same configuration for rsreportserver.config.

Test in PRERPSW01 is OK
Test in PRERPSW02 is KO

Log _ReportServerService__09_22_2015_13_58_31.log_ for PRERPSW02 test:

library!WindowsService_0!9cc!09/22/2015-14:38:48:: i INFO: Call to CleanBatch()
library!WindowsService_0!9cc!09/22/2015-14:38:48:: i INFO: Cleaned 0 batch records, 0 policies, 0 sessions, 0 cache entries, 0 snapshots, 0 chunks, 0 running jobs, 0 persisted streams, 0 segments, 0 segment mappings, 0 edit sessions.
library!WindowsService_0!9cc!09/22/2015-14:38:48:: i INFO: Call to CleanBatch() ends
ui!ReportManager_0-1!fa8!09/22/2015-14:39:44:: e ERROR: System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SetConnectionProtocol()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod(Boolean setConnectionProtocol)
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.ListItemTypes()
   at Microsoft.ReportingServices.UI.Global.SecureAllAPI()
   at Microsoft.ReportingServices.UI.GlobalLinks.Control_Init(Object sender, EventArgs args)
ui!ReportManager_0-1!fa8!09/22/2015-14:39:44:: e ERROR: HTTP status code --> 500
-------Details--------
System.Net.WebException: The request failed with HTTP status 401: Unauthorized.

   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SetConnectionProtocol()

   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod(Boolean setConnectionProtocol)

   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod()

   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.ListItemTypes()

   at Microsoft.ReportingServices.UI.Global.SecureAllAPI()

   at Microsoft.ReportingServices.UI.ReportingPage.EnsureHttpsLevel()

   at Microsoft.ReportingServices.UI.ReportingPage.ReportingPage_Init(Object sender, EventArgs args)

   at System.EventHandler.Invoke(Object sender, EventArgs e)

   at System.Web.UI.Control.OnInit(EventArgs e)

   at System.Web.UI.Page.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
ui!ReportManager_0-1!e70!09/22/2015-14:39:50:: e ERROR: System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SetConnectionProtocol()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod(Boolean setConnectionProtocol)
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.ListItemTypes()
   at Microsoft.ReportingServices.UI.Global.SecureAllAPI()
   at Microsoft.ReportingServices.UI.ReportingPage.EnsureHttpsLevel()
   at Microsoft.ReportingServices.UI.ReportingPage.ReportingPage_Init(Object sender, EventArgs args)
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Web.UI.Control.OnInit(EventArgs e)
   at System.Web.UI.Page.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
ui!ReportManager_0-1!c4c!09/22/2015-14:39:51:: e ERROR: System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SetConnectionProtocol()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod(Boolean setConnectionProtocol)
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.ListItemTypes()
   at Microsoft.ReportingServices.UI.Global.SecureAllAPI()
   at Microsoft.ReportingServices.UI.ReportingPage.EnsureHttpsLevel()
   at Microsoft.ReportingServices.UI.ReportingPage.ReportingPage_Init(Object sender, EventArgs args)
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Web.UI.Control.OnInit(EventArgs e)
   at System.Web.UI.Page.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
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