Bart Schaefer wrote: > On Oct 31, 2007 12:24 AM, Shawn Everett <shawn at tandac.com> wrote: >> telnet smtp.isp.net 25 generates the following: >> Trying a.b.c.d... >> Connected to smtp.isp.net. >> Escape character is '^]'. >> >> And then nothing. All other machines can connect to smtp.isp.net 25 >> without a problem. They also use that host for their outgong mail server. > > Have you contacted "isp.net", whoever they are, to make sure that they > have not blackholed or tarpitted that particular machine's IP address > for some reason? He said that the box is behind a nat and only that box behind the nat has a problem. I doubt that it has been specifically targetted by ip.