By default, elasticsearch listens on 127.0.0.1 interface only and port 9200 for Rest, this means that you would not be able to access elasticsearch from another machine on the same network by default. If kibana is installed on same machine, it will use localhost/127.0.0.1 (which is default elasticsearch.url in kibana.yml)
Check with the vendor or administrator of the server if they have setup elasticsearch to listen to any interface outside of loopback... They should know and can find out by using netstat command or checking elasticsearch.yml, there is no way for you to know this if you have no access to the server.