Please help.
When I try to sign in to the Nucleus server from Isaac Sim, I get the following error and cannot sign in:
2021-04-08 05:21:06 [68,704ms] [Warning] [omni.client.plugin] Tick: authentication: Could not connect to discovery service at “ws://localhost:3333”, attempting fallback authentication

I changed the default nuclear server settings in _build / linux-x86_64 / release / experience / isaac-sim.json, but it didn’t make sense.
Can anyone please tell me why I can’t connect to the Nucleus server?
Thanks you.