KB3171040 - "HTTP 503: Service unavailable" error when you open the SSRS web portal after you upgrade to SSRS 2016

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SQL Server 2016 Developer - duplicate (do not use) SQL Server 2016 Enterprise - duplicate (do not use) SQL Server 2016 Standard - duplicate (do not use) More...Less

Symptoms

You upgrade an earlier version of SQL Server Reporting Services (SSRS) to SSRS 2016. When you open the SSRS web portal, you receive the following error message:

HTTP 503: Service Unavailable

Resolution

The fix for this issue is included in the following cumulative update for SQL Server:

Cumulative Update 1 for SQL Server 2016

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

Latest cumulative update for SQL Server 2016

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology that Microsoft uses to describe software updates.