Might be worth examining the Server logs to see if the Server is taking errors connecting to R.
If I were to guess, I would suspect that Windows Firewall and/or your virus protection software are blocking port 6311 .
Troubleshooting R Connections
Thanks! I already followed that but it still doesn't connect.
HI Robert, what happens when you press the "Test Connection" button? If this fails, then one possibility is that RServe is not running; another possibility is that it is running on a different port.
Here's some addition information: R Implementation Notes | Tableau Software
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Once the workbook is published, does it render? Currently that error message appears whether R is configured or not, but the workbook will publish without issue. This error message should be changed in an upcoming version.
This is a bug in 9.0. It may give the error even if it successfully publishes it and renders it. Can you verify whether it is published or not?