Why my editor build gets stuck at 100% ?

Hi whenever I try to build my level the editor gets stuck on 100% , How can I fix this ?

What version of unreal is this?

Is this stopping at connecting to swarm, or after connecting at building stuff?

This is 4.27 and it is after clicking the build button

IS it stuck at “CONNECTING TO SWARM” or anything else?

Because it is stuck at swarm you check building options, and if there is nothing you see internet ports required for connecting to swarm.

it is stuck at starting up swarm connection(100%)
and unreal stops responding