Apply the solution that matches your root cause. If you find that the root cause is not covered in any of the above technical articles then please open an issue with support and provide the following information after the problem occurs:
2017-02-10 20:24:21,033 [StageExecutorTask-8] INFO (com.nolio.releasecenter.services.release.execution.engine.ArtifactPackageDistributionServiceImpl:96) - Downloading artifacts to retrieval agents for [Artifact_Package_1] for deployment [Deploy1Artifact-2 ID.3]. 2017-02-10 20:24:21,033 [StageExecutorTask-8] INFO (com.nolio.releasecenter.services.release.execution.engine.ArtifactsEngineImpl:313) - collecting data to download  artifacts to retrieval agents for release id 
2017-02-10 20:24:21,035 [StageExecutorTask-8] INFO (com.nolio.releasecenter.services.release.execution.engine.ArtifactsEngineImpl:467) - Artifact [ Artifact_Def_1.Artifact_Type_1'ver. Artifact_Ver_1'] Will be retrieved by the agent [ra552-nag1]
In the first message you can see the job name and release id. But another piece of important information is the thread (StageExecutorTask-8) as it will likely be the same thread that is used in the second and third message. The third message is showing which artifact retrieval agent (in this case: ra552-nag1) is being used to retrieve the artifact (in this case: Artifact_Ver_1).