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S-Driancourt's avatar
S-Driancourt
Frequent Visitor
9 years ago
Solved

Using HTTP data pump (msmdpump.dll) leads to (can't display visual) errors

Hi Everyone, In order to avoid opening port with fixed IPs we are also trying to connect Power BI Desktop in live connection to SSAS 2016 Multidim through http://..../msmdpump.dll It globally works...
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  • S-Driancourt's avatar
    S-Driancourt
    9 years ago

    Thank you very much Qiuyun Yu for your feedback.

    We just found the solution to our issue and you were right, the issue was coming  from the IIS Server, or mor precisely from the configuration of the msmdpump.

    We read the following article:

    http://amolpandey.com/2016/08/26/ssas-msmdpump-dll-failing-occasionally-under-high-user-loads/

     

    And we added the following 3 lines in the msmdpump.ini file

    <MinThreadPoolSize>0</MinThreadPoolSize>
    <MaxThreadPoolSize>0</MaxThreadPoolSize>
    <MaxThreadsPerClient>20</MaxThreadsPerClient>
     
    Now we do not have the issue anymore, in Power BI Desktop or in Power BI Services
    Best regards,
    Sylvain
tannera's avatar
tannera
Advocate II
9 years ago

Hi S-Driancourt, 

 

How did you get a live connection in Power BI desktop to your msmdpump.dll? Did you use a connection string?  

 

Kind regards

S-Driancourt's avatar
S-Driancourt
Frequent Visitor
9 years ago

Hi !

When you create your data connection, you choose  SQL Analysis Services database.
Then instead of the server name you put the URL : http;//myserver/OLAP/msmdpump.dll.

 

Exactly the same way you connect through Excel.

Sylvain

PS: sorry for my late answer, I was away theses days

  • tannera's avatar
    tannera
    Advocate II
    9 years ago

    Thanks Sylvain for your answer. 

     

    Did you ever encounter the impossibility to live connect to the pump using that method? From day one, we're not able to connect this way. In Excel or Tableau we have no problems. 

     

     

    Microsoft even say the live connection is not supported in this recent thread I made: https://community.powerbi.com/t5/Desktop/Any-timeline-on-when-a-live-connection-to-a-msmdpump-dll-SSAS/m-p/231183

     

    So I'm actually surprised you managed to live connect to your msmdpump.dll 

     

    What steps did you take for it to authentify you correctly? 

     

    Thanks

    • S-Driancourt's avatar
      S-Driancourt
      Frequent Visitor
      9 years ago

      Dear Tannera,

      I had this kind of message in the past when I first tried to get live query with msmdump.dll.

      One day, just to show the error message I had I tried again and it worked.
      What I had changed in the meantime was:

      - the version of PowerBI desktop

      - the version of SQL Server (2008R2 -> 2016 SP1)

      Sylvain

    • ChrisCoates's avatar
      ChrisCoates
      New Member
      4 years ago

      Hi - so I've been having the same issue but I *think* I just resolved it for us. I think it boils down to the fact the PowerBI SASS live connector doesn't support anything other than Windows Authentication. 

       

      Our msmdpump.dll component sits on an an IIS server in a different domain. Generally we access it though a browser that prompts for defferent domain credentials. For a number of reasons, we had to change the IIS server to use Basic Authenticationm though with credentials still stored in the AD.

       

      We managed to resolve some of those background issues, and I changed this particular application under the site (i.e. the OLAP directory) back to use Windows authentication and the Live connection started working. My application pool is using a single identity since we don't have Kerberos configured, which has "least permission" on the cubes themselves. this means that I can't configure any fine-grained access on this particular connector, which is OK for the time being whilst we transition these services into our main domain.

       

      Hope this helps anyone else hunting aroud these articles for a solution like me!