NetXMS Support Forum

I´ve installed NetXMS 4.2.395, webui 4.2.398, Grafana 9.3.1. and the NetXMS Plugin 1.2.3 on the same Windows Server 2019.
I never used Grafana before.
Now I tried to connect to NetXMS with Grafana but get an error "HTTP error Gone"
The api is shown in the Browser correctly, The User is memebr of NetXMS admin Group
Could someone help me here?