i have started noticing a very peculiar behavior when overwriting existing services from ArcMAP, please see below:
Stop arcgis server
Start arcgis server
NOTE: this is the only way to remove Service as it is stuck in an administrative process that never finishes.
NOTE: once Service was deleted, 1 zombie arcsoc remained for Service (this was probably the rogue administrative process)
this behavior is seeing repeatedly within 10.5.1 and im not sure if other have seen this as well or if ESRI is aware of this behavior? I would assume not since there are no patches for 10.5.X that would address this.