We have a server which is accessed from two different clients. Both the clients are separated from the server through firewalls. Networking team has confirmed that the port 22 for ssh has been opened for accessing this server from both the clients. I am told sftp uses the same port as ssh.
From one of the clients I can sftp to the server with an account firstname.lastname@example.org
. I have confirmed account a does exist on the server.
From other client when I sftp, this is what I see
[client2@hostname ~]$ sftp email@example.com
Connecting to server.domain.com...
reverse mapping checking getaddrinfo for server.xxx.domain.com failed - POSSIBLE BREAKIN ATTEMPT!
Permission denied, please try again.
Note the reverse mapping checking address(server.xxx.domain.com) is different from the server I am trying to connect(server.domain.com). There is an additional xxx value in the FQDN.
I am not sure what is wrong and what questions do I need to ask Networking team. Per networking team, since ssh and sftp work, their configuration is fine. Per the OS team, since the account a exists on the server and I can connect from other client, means OS configuration is fine.
Any suggestions on where the issue could be and how can we fix it?