We couldn't connect to the Analysis Services server. Make sure you've entered the connection string

[ytian001]

We received the below error, when we open the dashborad. 

1. the connection is tested sucessfully. 

2. we upgraded the report server to the latest version, Version1.13.8054.40631(January 2022)

3. we also recreated analytics database. 

but still the same error message. when the dashborad try to pull the data from data cube. 

anyone is familar with this issue? Can you please help? your help is very appreicated. 

An unexpected error occurred
An unexpected error occurred. Please try again later.
Please try again later or contact support. If you contact support, please provide these details.
We couldn't connect to the Analysis Services server. Make sure you've entered the connection string correctly.:
Request ID: 06cee2e0-a499-114b-d23e-943699df8258
Time: Tue Jan 25 2022 16:09:46 GMT-0600 (Central Standard Time)
Service version: /powerbi/libs

[ytian001]

I found the below error in RSManagement.log

2022-01-31 07:37:07.3593|ERROR|12|Unhandled error in the Web API. Exception: System.Net.Http.HttpRequestException: Error while copying content to a stream. ---> System.IO.IOException ---> System.Net.HttpListenerException: The I/O operation has been aborted because of either a thread exit or an application request
at System.Net.HttpResponseStream.EndWrite(IAsyncResult asyncResult)
at Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.EndWrite(IAsyncResult asyncResult)
--- End of inner exception stack trace ---
at Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.EndWrite(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of inner exception stack trace ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.Owin.HttpMessageHandlerAdapter.<SendResponseContentAsync>d__33.MoveNext()| RequestID = s_8aa4d574-d464-4c8f-9de5-58f09022b3a5
2022-01-31 07:37:07.3593|INFO|12|NET\DCV9143 127.0.0.1: GET /api/v1.0/ManagementState - 0:00:00.021462
Connection dropped| RequestID = s_8aa4d574-d464-4c8f-9de5-58f09022b3a5 System.Threading.Tasks.TaskCanceledException: A task was canceled.

[Icey]

Hi @ytian001 ,

Have you tried to use the corresponding version (2.100.1381.0 64-bit (January 2022)) of Power BI Desktop (Optimized for Power BI Report Server)?

In addition, please check if this post could help you:

Solved: Power BI RS: error connection on SSAS with windows... - Microsoft Power BI Community

Best Regards,

Icey

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[ytian001]

I found the below error in RSPowerBI_2022_01_28_00_07_01 log. however, the connection we tested sucessfully. but when open dashborad, it shows error. 

2022-01-28 02:00:03.1699|ERROR|104|Error Processing Data Model Refresh: SessionId: 461d33cc-515f-4fd2-90e1-fde6d62b8846, Status: Error Model can not be refreshed because not all connection string is valid, Exception Microsoft.PowerBI.ReportServer.AsServer.InvalidDataSourceException: Model can not be refreshed with no connection string

   at Microsoft.PowerBI.ReportServer.WebHost.EventHandler.AnalysisServicesDataRefresh.ValidateConnectionString(IEnumerable`1 dataSources)

   at Microsoft.PowerBI.ReportServer.WebHost.EventHandler.DataRefreshScope.<>c__DisplayClass34_0.<ExecuteActionWithLogging>b__0()

   at Microsoft.PowerBI.ReportServer.WebHost.EventHandler.DataRefreshScope.<ExecuteFuncWithLogging>d__33`1.MoveNext()

[ytian001]

here is more info regarding the issue.

Reports will load but not connect to SSAS;

Have tested and confirmed that

• SSAS (Data Source) is functional and port is not blocked
• Report works in PBI desktop w/ same connection string and account
• We upgraded the report server to the latest version, Version1.13.8054.40631(January 2022) (previously was March 2020)
• We also created a new Report Server Database to eliminate a possible issue
• We were able to create a report that worked when it’s data source was a local excel doc. 
• All other reports that connect to a SSAS data source through Report Server get this message -

An unexpected error occurred
An unexpected error occurred. Please try again later.
Please try again later or contact support. If you contact support, please provide these details.
We couldn't connect to the Analysis Services server. Make sure you've entered the connection string correctly.:
Request ID: 06cee2e0-a499-114b-d23e-943699df8258
Time: Tue Jan 25 2022 16:09:46 GMT-0600 (Central Standard Time)
Service version: /powerbi/libs

[JPM]

Was the issue happening before you upgraded to Jan 2022?

Are you using Kerberos auth?

I have seen same issue on Jan 2021 ,it was due to a Windows Update on the Domain Controller

[ytian001]

yes, it happens to old version, that is why we tried to upgrade it. we have prod env with same version, it works fine. only Dev has this issue. we compare the configuration between prod and dev, they are same. no we do not use kerberos. we connect to DB using windows authenticaiton.