How can two Logstash istances communicate to each other?

i have two logstash istances (not forwarder, not filebet) on two different servers: which input/output plugins should i use to permit the data transfer to each other?

I suggest you use the Lumberjack protocol, i.e. a lumberjack output/input pair.

Hi magnusbaeck,
thanks for your reply. I have a problem: my logstash istance is behind a proxy, so i'm not able to send data

Well, that was obviously a relevant piece of information. Does the proxy only allow HTTP traffic, or what kind of proxy is it? I don't think there are too many Logstash plugins that support proxies but it might be possible to set up a transparent one.