How to fix "Lighting build failed"

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So i’m having this problem on a freshly installed copy of UE4, worked fine yesterday and i have not made any updates to anything since then, tried several fixes suggested here before and they did not work. it will not initialize building the lights in the first place so its not getting “stuck”. Any ideas ?

Hello, installer from the website. I did a complete reinstall ( of the epic launcher itself too ) and it worked for 2 hours, i think i got closer to the problem. In swarm agent there is/was now my machine listed under swarm status which was not there before. So its broken again. fairly confident its to do with Swarm agent. “Certificate check has failed”

Hi Kena, is it a binary version (i.e. installer) or compiled from source (i.e. visual studio)?

hi
yesterday i came across same problem … no way to build map lightning on one map of project … even if i removed everything from map … nothing left there only empty map and still build failed … only on that one map … its sad that this bug is here for such a long time …

Bump this up, I’m having the same issue, Tried disabling windows firewall entirely, then verifying the installation, and the same failure.