This message is printed by the HTTP Server when it checks if a client wanting to connect to data/event is really using the data/event ip-address and port.
Activate -dbg HTTP on the CTRL Manager (HTTP Server) and check what the "CONNECT" message it receives really contains as IP/Port for the data.
The error is given e.g. when the client and the server disagree on the IP Address of the host data/event run on, e.g. when the DNS result done on the client
is different than done on the server (e.g. internal/external network).
Make sure that the config file sent to the webclient contains the correct IP Address for data/event (e.g. using IP Address and not hostnames or using
config.webclient to have special definition for what the webclient shall use)
