we created virtual services for web services calls and the requests are hits concurrently our services. First request it hitting and getting proper response. Same request we tried one or more times our virtual services are going offline .
Most of the times, this issue happens when you create virtual service manually. If any of the step in VSM has a scenario/Environmental error assertions routed to Abort or fail the test, VSM will go offline with that particular scenario.
Make sure there are no redirection calls to Abort/fail the tests in vsm file. Instead route request to Generate errors. Make necessary changes in VSM file and re-deploy the service to resolve this issue.