Yes, it’s possible to open ports other than for SSH.
Contact the Lambda Support team with the following information:
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The public IP address of your instance, that is, the IP address that you use to SSH into your instance.
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The port number or range of ports you want opened. You can additionally specify the protocol, either TCP or UDP, or both. If you don’t specify a protocol, the port(s) will be opened to both incoming TCP and UDP traffic.
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The source IP address(es) you want to allow connections from. If you don’t specify at least one source IP address, the ports will be opened to incoming traffic from any source.
The Lambda Support team can also configure your instance to reply to ICMP
messages used by diagnostic tools such as ping and traceroute.