Deploying rocketchat in vm in gcp

Hi,

Deploying rocketchat in the gcp vm using a custom docker-compose.yml code, yes it is working in localhost:3001 but when I set up a dns to it in the load balancer I encountering 503 error “upstream connect error or disconnect/reset before headers. retried and the latest reset reason: remote connection failure, transport failure reason: delayed connect error: Connection refused” and ssl error when trying to curl the created dns.

can anyone with the same issue?