SBT Assembly publish fat jar to Nexus - sbt

Question

I'm trying to push a fat jar generated by sbt-publish to a private Nexus repository. So, in my Nexus, I've created two repositories, one hosting snapshots version and one hosting releases artifacts.
Here is the important code in my build.sbt:
publishTo := {
val nexus = "http://localhost:8081/"
if (isSnapshot.value)
Some("snapshots" at nexus + "repository/test-snapshots")
else
Some("releases" at nexus + "repository/test-releases")
}
credentials += Credentials(
"Sonatype Nexus Repository Manager", "localhost", "admin", "admin123"
)
artifact in (Compile, assembly) := {
val art = (artifact in (Compile, assembly)).value
art.withClassifier(Some("assembly"))
}
addArtifact(artifact in (Compile, assembly), assembly)
Here's a part of the stacktrace:
[info] Assembly up to date: /.../target/scala-2.11/test-assembly-1.0-SNAPSHOT.jar
[info] published test_2.11 to http://localhost:8081/repository/test-snapshots/com/test/test_2.11/1.0-SNAPSHOT/test_2.11-1.0-SNAPSHOT-javadoc.jar
[info] published test_2.11 to http://localhost:8081/repository/test-snapshots/com/test/test_2.11/1.0-SNAPSHOT/test_2.11-1.0-SNAPSHOT-sources.jar
[info] published test_2.11 to http://localhost:8081/repository/test-snapshots/com/test/test_2.11/1.0-SNAPSHOT/test_2.11-1.0-SNAPSHOT.jar
[info] published test_2.11 to http://localhost:8081/repository/test-snapshots/com/test/test_2.11/1.0-SNAPSHOT/test_2.11-1.0-SNAPSHOT.pom
[error] java.net.SocketException: Broken pipe (Write failed)
So, as we can see, it is able to publish the artifacts until the pom file.
Thank you in advance for your help !