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503 – ServiceUnavailable Errors in SSRS Reports when User load is increased.

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HI,

In our project we have 15 Reports to be tested with VSTS Load Test.

We have one SSRS DB and four Report Server Apps with NLB.

If we are testing the reports with 40 users (10 Users per each report Server App) everything is working fine, but if we increase the load to 60 Users, we are getting 503 – ServiceUnavailable Errors in VSTS.

In MSDN Blog they mentioned that this my be caused by Memory Pressure, but I did't saw any Memory congestion in SSRS DB or Apps. The CPU Utilizaton is 50% in Apps.

Please let me know weather there is any confogurations in SSRS to handle more no. of Users/Load?
Or This is because of Throttling? or any other reasons? and what is the possible solution?


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