How to disable the reverse DNS lookup by the SSD server on Linux? To turn off reverse DNS lookups of the SSH daemon, log on the server and add UseDNS no to /etc/ssh/sshd_config. And remember to restart the sshd service by service sshd restart or systemctl restart sshd.service or other commands depending on your system. Read more: How to Speed Up Firefox DNS Lookup in Linux How to get files without certain strings in their files names (reverse of *string*) on Linux? How to resolve a domain name from a specific DNS server instead of the configured one in Linux? How to check the DNS I am using on Linux? Dynamics CRM Consultants Explain How To Filter Sub Branch Lookup Field Value in CRM How to Flush DNS Cache of Linux and Windows Client How to disable all swaps on Linux How to disable laptop’s internal keyboard on Linux?