I try test simple apps on Vaadin8 by JMeter5.
From browser all works fine.
Also all works if I turn-on proxy-server in JMeter and walk from FF or Chrome - all my steps well record.
But when I try play recorded steps then I get follow error: “app use сookie. cookie must enabled in browser”.
But in http_default_manager of JMeter I see “cookie compatible”, also switched “clear cookie before new test”.
Sometime I get other error: “communication problem”