$ grpcurl [fullnode-testnet-address] list
grpc.health.v1.Health
grpc.reflection.v1alpha.ServerReflection
sui.node.v2.NodeService
sui.rpc.v2alpha.LiveDataService
sui.rpc.v2alpha.SubscriptionService
sui.rpc.v2beta.LedgerService
sui.rpc.v2beta.TransactionExecutionService
$ grpcurl [fullnode-mainnet-address] list
Failed to list services: rpc error: code = Unknown desc = unexpected HTTP status code received from server: 408 (Request Timeout); transport: received unexpected content-type “text/html; charset=UTF-8”
Meanwhile my code uses GRPC to call LedgerService.GetObject, works on testnet, but not mainnet…