@Albot, that’s actually not quite true any more. Most Aerospike clients do have limited support for using a load balancer for seed node discovery: Considerations on Aerospike client seeding with AWS route53 DNS and ELB (load balancer). For the Ruby client, support was added recently in v2.10.0.
@madejejej, do you see any other errors in the client logs? Esp. Seed #{seed} failed.