Ssh Login Slow Gssapi, Fix slow SSH logins on Debian 13 by pinpointing DNS reverse lookups and GSSAPI delays, then applying safe sshd_config changes and tests. Note : Be careful when doing this on production servers. The SSHD configuration is modified at the slower connection speed, and at the same time, the DNS reverse analysis and GSSAPI authentication are turned off. Try log in Learn how to troubleshoot and fix slow SSH connections in Linux by analyzing DNS issues, reverse lookups, network latency, and TCP performance to optimize access. My putty settings were I configured a few Linux servers to authenticate with Active Directory Kerberos using sssd on RHEL6. Fix slow SSH logins on Debian 13 by pinpointing DNS reverse lookups and GSSAPI delays, then applying safe sshd_config changes and tests. I ran ssh -v and I found that it gets up to this: debug1: ssh_ecdsa_verify: Remote exploitation requires that the SSH server allow GSSAPI authentication and that logging level is configured to SSH_LOG_PACKET (the numeric value 3) or higher. I also enabled GSSAPI authentication in hopes of passwordless logins. This lesson explains why this happens and how to fix this issue. Even if you have "UseDNS no" in /etc/sshd_config, sshd may still perform reverse DNS lookups if /etc/hosts. enoph sb ioa 2gqt rqh6ee q8dz2mz rtcy ie5ca pfij pmgnefj