SSH connections delay about 20 seconds when useDNS=no. Solution Unverified - Updated 2019-04-19T16:10:20+00:00 - English . No translations currently exist.

In Red Hat Enterprise Linux 7.4, the default value of the UseDNS configuration option had been changed to "No". This change prevented OpenSSH from translating IP addresses to host names to be used in server configuration files and access rules of the authorized_keys files. sshd_config(5): OpenSSH SSH daemon config file - Linux man UseDNS Specifies whether sshd(8) should look up the remote host name and check that the resolved host name for the remote IP address maps back to the very same IP address. The default is ''yes''. UseLogin Specifies whether login(1) is used for interactive login sessions. The default is ''no''. Solved: Ironport setup - Cisco Community

Nov 26, 2018

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Mar 26, 2020 Slow SSH Login | UseDNS=no – The Caffeinated Admin Nov 30, 2017 Setting up a ssh-server - Alpine Linux UseDNS no # By setting this to no, connection speed can increase. PasswordAuthentication no # Do not allow password authentication. Other configuration options are shown in /etc/ssh/sshd_config. The file includes comments that explain many of the options. Firewalling and Port Changes. By default, sshd will communicate on TCP port 22. Using OpenSSH with Kerberos - IBM If UseDNS is set to Yes, the ssh server does a reverse host lookup to find the name of the connecting client. This is necessary when host-based authentication is used or when you want last login information to display host names rather than IP addresses.