The complete message says:
Couldn't get remote service: 'servoy.IJasperReportService' for a not authenticated client
I know you have to put 'servoy.IJasperReportService' into the Server configuration field trustedRemotePlugins, and we did that.
But that seems not to help, our clients get that message above in their console and on the server log when they start up.
Could it be that the core-problem is that Java loads all the plugins from the cache already, while the client's user is not authenticated so far by login?