When sharing a WebTcpipListen "connection handle" between virtual users (vusers), a "webengine: 9 - invalid handle" error will occur during your load test if the number of vusers exceeds the "Virtual users per process" value. It occurs because it is not possible to pass a connection handle between one process (vuser "perfrun.exe") and another. To prevent this error, you should ensure that the "Virtual Users per Process" value is at least equal to, or greater than, the number of vusers in the load test. Set via "SETTINGS | SYSTEM | CONTROL" the "Virtual Users per process" specifies the number of virtual users to be run within a single system "perfun.exe" thread. Old KB# 17154
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