are you running on a linux box ?
try adding -Djava.net.preferIPv4Stact=true in the Optional JVM args
also are you running a single node or clustered env ?
I am running a clustered server with 1 cluster. I am running on a linux box.
The -Djava.net.preferIPv4Stact=true appaers to not help :(
Can I find out where the exception is cooming from?
11:35:20,165 ERROR [UDP] exception=java.io.IOException: Network is unreachable, msg=[dst: 126.96.36.199:45566, src: se-ore-webp-test:32787 (additional data: 14 bytes) (2 headers), size = 0 bytes], mcast_addr=188.8.131.52:45566
Thank you, with the information there I managed to solve it! It was related to the IP stack just as you guessed!