Thanks to a wonderful source of help (I deleted the email, and the poster didn't cc debian-users), this problem has been solved. The 10.20.0.2 machine had a line in /etc/hosts.deny which looke like:
ALL: PARANOID which would prevent me from logging in from my Debian box. However, both Red Hat and Windows implementations of telnet, and a Windows secure shell client (securecrt) could log onto the box denying me access. After commenting out the paranoid line (which is documented as preventing all connections) I could connect without problems from any machine. Is this a bug with inetd or portmap? (BTW: Sorry about some confusion in the original post. My search-replace skills obviously need work...) > Aaron Brashears wrote: > > > > D1 (10.20.0.1), and D2 (10.20.0.2) are both synched to potato on > > debian.org. Both machines have telnetd, telnet, ssh, and sshd available > > or running. Here's a sample session from D1: > > > --------------------------------- > > $ telnet 10.20.0.2 > > Trying 10.20.0.2... > > Connected to 10.20.0.2. > > Escape character is '^]'. > > Connection closed by foreign host. > > > > $ ssh 10.20.0.2 > > Connection closed by foreign host. > > --------------------------------- > > Here's what happens from D2: > > > > --------------------------------- > > $ ping 10.20.0.1 PING 10.20.0.1 (10.20.0.1): 56 data bytes > > 64 bytes from 10.20.0.1: icmp_seq=0 ttl=64 time=0.6 ms > > 64 bytes from 10.20.0.1: icmp_seq=1 ttl=64 time=0.3 ms > > 64 bytes from 10.20.0.1: icmp_seq=2 ttl=64 time=0.3 ms > > 64 bytes from 10.20.0.1: icmp_seq=3 ttl=64 time=0.3 ms > > > > --- 10.20.0.1 ping statistics --- > > 4 packets transmitted, 4 packets received, 0% packet loss > > round-trip min/avg/max = 0.3/0.3/0.6 ms > > > > $ telnet 10.20.0.1 > > Connected to 10.20.0.1. > > Escape character is '^]'. > > Debian GNU/Linux 2.2 (frozen) kona > > kona login: > > > > $ ssh 10.20.0.1 > > scribe:/home/aaron# ssh -l aaron 10.20.0.1 > > [EMAIL PROTECTED]'s password: > > ---------------------------------