Sorry to resurrect an old thread but im having this same issue and switch to local host isnt doing anything, It’ll get past the initial cant connect to swarm but by the end of the light bake the connection to coordinator will fail and the build will look like it went through in the unreal engine log, but not on the swarm agent log. Can get light if i switch to stationary but even dynamic shadows dont show up. Sometimes swarm will even switch itself BACK to render0 from local host