@dzbeda Seeing "localhost" in your shared log output leads to what may be the issue. When you configure the URL in the Remote Process Group (RPG), it tells that NiFI RPG to communicate with that URL to fetch the Site-To-Site (S2S) details. Included in those returned details are things like: - number of nodes in target NiFi cluster (if standalone returns only one host) - The hostnames of those node(s) (in this case it looks like maybe localhost is being returned - Configured RAW port if configured - Whether HTTP transport protocol is enabled - etc... So when you RPG actually tries to send FlowFiles over S2S it is trying to send to localhost which results in itself rather than the actual target linux NiFi it fetched the S2S details from. When some properties are left unconfigured, NiFi returns whatever the OS resolves. I am going to guess your linux server is returning localhost rather than the actual hostname. You will want to verify your S2S configuration setup in the target NiFi (linux server): http://nifi.apache.org/docs/nifi-docs/html/administration-guide.html#site_to_site_properties Try setting the " nifi.remote.input.host" to see if that helps you. Hope this helps, Matt
... View more
