i am getting same error tryed two different virtual server
I think maybe try using an internal ip address not public ip address
internal IP maybe 192.168.100 and 192.168.200 up to your server (maybe 10.10.0.100 and 10.10.0.200)
some cloud server has local network config (Digitalocean Linode Vultr) try use it before use internal ip address
if used at home local network maybe use ip address at the same router (internal ip address)