During review of logs of agents, we identified that the issue is lying within Team-city artifactory where the uploaded artifacts during Team-city build is not getting index ready by time RA agents (agents responsible for distribution of artifacts) are making a download request to Team-city artifactory.
We identified the same from the logs (nolio_all.log) which during failed-paused state throws HTTP 404 error which on resume goes fine.
2017-09-19 04:45:53,843 [ArtifactsHandlers-4] INFO (com.nolio.platform.shared.communication.services.artifacts.repositoryplugins.ArtifactRepositoryPlugin:231) - Artifact [/20/Test_Service_EAR/test-33/EAR-test-33.zip] was not found in the repository [https://NAC-URL:NAC-Port/nexus/content/repositories/nolio]. response was [HTTP/1.1 404 Not Found]
2017-09-19 04:45:53,845 [ArtifactsHandlers-4] DEBUG (com.nolio.platform.shared.communication.services.artifacts.ArtifactCommunicationService:318) - Artifact [/20/Test_Service_EAR/test-33/EAR-test-33.zip] was not found in the repository, It will be uploaded to the repository after it's retrieved.