I have an asp.net/Razor app that I like to perform a load test on, but NeoLoad reports the error "java.util.concurrent.ExecutionException: org.eclipse.jetty.websocket.api.UpgradeException: Didn't switch protocols, expected status <101>, but got <404>"
As far as I can tell, NeoLoad is not able to upgrade the connection to WebSockets. When I inspect network traffic in the Web Developer Toolbar of Firefox, I see traffic via WebSockets, so it appears as if the server/app side is working properly and the problem lies with NeoLoad.
When I let NeoLoad analyse the response to identify dynamic data, it does not find any dynamic data (suggested solution in a similar question).
Any suggestions on how to prevent this error message would be highly appreciated.
Thanks, Kurt