Error when registering new client

[Thanh]

Hi,

Recently, my customers often report a problem when accessing report reviewer (see attachment Error1.jpg). I inspected and found out that the problem is the error when registering the client with reporting service. I try to re-produce the issue by using Postman and it happens but not frequently (see attachment Error2.jpg). Sometimes it happens, sometimes not. I cannot figure out the cause.

Please help!

[Thanh]

My report version is Q1 2016 SP1.

This issue happens after I switch our application to backup server (for maintenance) and then switch back to main server.

[Scott Waye]

I've seen this on premises where you have multiple virtual applications on the same physical server.  What we do is set the `HostAppId` differently in each application in the constructor for the class that extends `ReportsControllerBase`