Click on cache container -> Actions -> Manage backup sites -> Push state (on BRN site which is configured)

result: nothing happens, server log:
[Server:server-one] 15:15:03,752 ERROR [org.jgroups.protocols.relay.RELAY2] (ServerService Thread Pool – 36) master:server-one: no route to BRN: dropping message

expected result: Success! The operation has been successfully executed.

Please note that if we take the site offline and then online again in the "Manage backup sites" dialog, push state button works correctly.

Cancel state button is behaving the same, except taking site offline and then online again doesn't help.

I'm attaching server configuration