Public bug reported:

landscape-client 19.12-0ubuntu4.2

my client.conf contains

    [client]
    url = https://my.super.secret.company.com/message-system

that allows to reach a private landscape-server whenever I am on the
company's network.

When I am not connected on my company's network, I expect no traffic to be 
attempted to the private landscape-server. In practice though, the client will 
keep trying to connect and send DNS queries to resolve 
my.super.secret.company.com (they all fail).
This is unencrypted traffic to a public DNS server, so my laptop is leaking the 
private URL of the landscape server. I would like to prevent this traffic, 
basically:

"my.super.secret.company.com" name should never be sent to a DNS server
not owned by my company.

(of course I would love a generic solution as landscape-client is not
the only one doing this :) but it is the worst offender on my laptop)

** Affects: landscape-client (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1950000

Title:
  landscape-client leaking the private URL of the server

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