We have the following error from our build:

Failed to deploy artifacts: Could not transfer artifact com.example:foo:exe:1.0.0-20170510.075234-1 from/to snapshots (http://nexus.example.net/nexus/content/repositories/snapshots): Connection reset by peer: socket write error
{{[Pipeline] }}}

Helpful, eh?

So we ran tcpdump on the Nexus box and finally found a response from Nexus indicating a fault. It's a HTML-formatted response which just gets swallowed (something within our Nexus went wrong).

While we now have a handle on why things do not work for us, it is a major pain to go down to the tcpdump level. Is this plugin missing an Accept header to make Nexus return computer-readable responses perhaps that your plugin can then forward to the build log?