Github user randerzander commented on the issue:
https://github.com/apache/nifi/pull/1307
This may be an artifact of Docker generating hostnames that don't parse
well.
Here's what I see in my testing:
monitor.dev_1 | 2016-12-09 19:41:34,127 INFO [Site-to-Site Worker
Thread-6] o.a.nifi.remote.SocketRemoteSiteListener Received connection from
techops_web-service.dev_1.techops_dev/172.18.0.5, User DN: null
monitor.dev_1 | 2016-12-09 19:41:34,127 ERROR [Site-to-Site Worker
Thread-6] o.a.nifi.remote.SocketRemoteSiteListener Handshake failed when
communicating with nifi://techops_web-service.dev_1.techops_dev:42626; closing
connection. Reason for failure: java.lang.IllegalStateException: Unable to get
host or port from peerUrlnifi://techops_web-service.dev_1.techops_dev:42626
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