Appliance 5250 4.1 unable to activate log forwarding

hello,

i tried to activate log forwarding to a syslog server and got the simple error : The server name or IP address is either not valid or not reachable

I checked the network (curl & nc) and the flows are open to the destination on port TCP/514

i tried to configure the Log forwarding by CLI with 0 as interval and No for TLS.

i searching in log files but don't find any other information to understand what is the problem.

Have you an idea ?

Thank you.