Unable to Access an ASA Managed Server Externally via a Bastion Host

While accessing an ASA-managed server via a bastion host, the following error might be experienced, resulting in being unable to access an ASA-managed server externally via a Bastion Host:

dial tcp: lookup my-bastion: no such host

• Advanced Server Access (ASA)

• ASA managed instance

• Bastion server

• ASA URL handler

This error only comes up when the server is accessed from the Internet without a VPN connection.

Ensure that the bastion server's hostname is either resolvable via public DNS or there is an entry in the /etc/hosts file that points the bastion to an appropriate external IP address.

/etc/hosts content

[~]$ more /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
1.1.1.204     my-bastion.<domain>.com my-bastion

ASA URL handler example:

scaleft://<my account>@app.scaleft.com/t/<my project>/a/server.domain.com/rdp?via=my-bastion