----- Original Message ---- > From: "aurfalien at gmail.com" <aurfalien at gmail.com> > To: CentOS mailing list <centos at centos.org> > Sent: Thu, 21 January, 2010 20:07:27 > Subject: Re: [CentOS] trouble shooting slow ssh logins > > > aurfalien at gmail.com wrote: > >> Hi all, > >> > >> I noticed that my ssh logins to a particular server were taking up to > >> 5 seconds to finally login. > > > > This is frequently a DNS issue, is forward+reverse DNS functional? > > DNS was normal, forward reverse lookups exist and match that host. > Is the server able to to reverse lookups on the IP address of the incoming client? A day or two ago post a suggestion to use UseDNS No in the sshd config file (from memory), which worked for me. HTH.