From: carriunix@gmail.com   
      
   Hi, Henrik. Thanks for the reply.   
      
   On 2021-09-04, Henrik Carlqvist  wrote:   
      
   > Are server1 and server2 configured with public IP addresses? Or (as I   
   > would guess) are they behind some kind of NAT firewall?   
      
   There is some firewall: if I try to use any port but 3333, connection fails.   
   Even if properly set in sshd_config. However, the IP used is the public IP,   
   those that we get using curl or wget testing.   
      
   > If they are behind some NAT firewall I would doublecheck the settings of   
   > that. The fact that it has been configured to allow port 3333 connections   
   > to server2 might not for sure mean that also port 3333 connections to   
   > server1 are allowed.   
      
   I must contact the network admin (oh, here comes the burocracy!) to be sure.   
      
   > If the problem really were server1 configuration you would not be able to   
   > connect from any remote machine at all or see some explanation in the log   
   > file why some remote machines are discriminated.   
      
   Ok.   
      
   > When you connect from the outside, how do you differ between server1 and   
   > server2? If they are behind a NAT router my guess is that router would   
   > have only one IP address? If they are not behind a NAT router but have   
   > their own public IP addresses, what kind of device do you have that only   
   > allows port 3333?   
      
   As I said, we use the public IP of the servers. Obviously, I'm not a network   
   expert, so I must contact the admin to know that. My point is, all the other   
   users are non-experts too. And they set their Ubuntu servers, without   
   contact the network admins. So, I though that should be something with the   
   config.   
      
   I will try to get some answers. Thank you, again.   
      
   --   
   May the Source be with you!   
   carriunix   
      
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